WorldWideScience

Sample records for fiber membrance technology

  1. Fiber Optics Technology.

    Science.gov (United States)

    Burns, William E.

    1986-01-01

    Discusses various applications of fiber optics technology: information systems, industrial robots, medicine, television, transportation, and training. Types of jobs that will be available with fiber optics training (such as electricians and telephone cable installers and splicers) are examined. (CT)

  2. Airclad fiber laser technology

    DEFF Research Database (Denmark)

    Hansen, Kim P.; Olausson, Christina Bjarnal Thulin; Broeng, Jes

    2008-01-01

    High-power fiber lasers and amplifiers have gained tremendous momentum in the last five years, and many of the traditional manufactures of gas and solid-state lasers are pursuing the attractive fiber-based systems, which are now displacing the old technology in many areas. High-power fiber laser...... laser system. We present the latest advancements within airclad fiber technology including a new 70 μm single-mode polarization-maintaining rod-type fiber capable of amplifying to MW power levels. Furthermore we describe the novel airclad based pump combiners and their use in a completely monolithic 350...... W CW fiber laser system with an M2 of less than 1.1. Finally, we briefly touch upon the subject of photo darkening and its origin....

  3. Airclad fiber laser technology

    DEFF Research Database (Denmark)

    Hansen, Kim P.; Olausson, Christina Bjarnal Thulin; Broeng, Jes

    2011-01-01

    High-power fiber lasers and amplifiers have gained tremendous momentum in the last 5 years. Many of the traditional manufacturers of gas and solid-state lasers are now pursuing the fiber-based systems, which are displacing the conventional technology in many areas. High-power fiber laser systems...... laser system. We present the latest advancements within airclad fiber technology including a new 100 m single-mode polarization-maintaining rod-type fiber capable of amplifying to megawatt power levels. Furthermore, we describe the novel airclad-based pump combiners and their use in a completely...... monolithic 350 W cw fiber laser system with an M2 of less than 1.1. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)....

  4. Fiber Optics and Library Technology.

    Science.gov (United States)

    Koenig, Michael

    1984-01-01

    This article examines fiber optic technology, explains some of the key terminology, and speculates about the way fiber optics will change our world. Applications of fiber optics to library systems in three major areas--linkage of a number of mainframe computers, local area networks, and main trunk communications--are highlighted. (EJS)

  5. Fiber-optic technology review

    Energy Technology Data Exchange (ETDEWEB)

    Lyons, P.B.

    1980-01-01

    A history of fiber technology is presented. The advantages of fiber optics are discussed (bandwidth, cost, weight and size, nonmetallic construction and isolation). Some aspects of the disadvantages of fiber systems briefly discussed are fiber and cable availability, fiber components, radiation effects, receivers and transmitters, and material dispersion. Particular emphasis over the next several years will involve development of fibers and systems optimized for use at wavelengths near 1.3 ..mu..m and development of wavelengths multiplexers for simultaneous system operation at several wavelengths.

  6. Carbon Fiber Technology Facility (CFTF)

    Data.gov (United States)

    Federal Laboratory Consortium — Functionally within the MDF, ORNL operates DOE’s unique Carbon Fiber Technology Facility (CFTF)—a 42,000 ft2 innovative technology facility and works with leading...

  7. Lab-on-fiber technology

    CERN Document Server

    Cusano, Andrea; Crescitelli, Alessio; Ricciardi, Armando

    2014-01-01

    This book focuses on a research field that is rapidly emerging as one of the most promising ones for the global optics and photonics community: the "lab-on-fiber" technology. Inspired by the well-established 'lab on-a-chip' concept, this new technology essentially envisages novel and highly functionalized devices completely integrated into a single optical fiber for both communication and sensing applications.Based on the R&D experience of some of the world's leading authorities in the fields of optics, photonics, nanotechnology, and material science, this book provides a broad and accurate de

  8. Ceramic fiber filter technology

    Energy Technology Data Exchange (ETDEWEB)

    Holmes, B.L.; Janney, M.A.

    1996-06-01

    Fibrous filters have been used for centuries to protect individuals from dust, disease, smoke, and other gases or particulates. In the 1970s and 1980s ceramic filters were developed for filtration of hot exhaust gases from diesel engines. Tubular, or candle, filters have been made to remove particles from gases in pressurized fluidized-bed combustion and gasification-combined-cycle power plants. Very efficient filtration is necessary in power plants to protect the turbine blades. The limited lifespan of ceramic candle filters has been a major obstacle in their development. The present work is focused on forming fibrous ceramic filters using a papermaking technique. These filters are highly porous and therefore very lightweight. The papermaking process consists of filtering a slurry of ceramic fibers through a steel screen to form paper. Papermaking and the selection of materials will be discussed, as well as preliminary results describing the geometry of papers and relative strengths.

  9. Fiber optics physics and technology

    CERN Document Server

    Mitschke, Fedor

    2016-01-01

    This book tells you all you want to know about optical fibers: Their structure, their light-guiding mechanism, their material and manufacture, their use. It began with telephone, then came telefax and email. Today we use search engines, music downloads and internet videos, all of which require shuffling of bits and bytes by the zillions. The key to all this is the conduit: the line which is designed to carry massive amounts of data at breakneck speed. In their data carrying capacity optical fiber lines beat all other technologies (copper cable, microwave beacons, satellite links) hands down, at least in the long haul; wireless devices rely on fibers, too. Several effects tend to degrade the signal as it travels down the fiber: they are spelled out in detail. Nonlinear processes are given due consideration for a twofold reason: On the one hand they are fundamentally different from the more familiar processes in electrical cable. On the other hand, they form the basis of particularly interesting and innovative ...

  10. Preparation and property study of PHBV/PVA composite membrances%PHBV/PVA复合膜的制备及其性能研究

    Institute of Scientific and Technical Information of China (English)

    赵晓燕; 赵晓画; 周大成; 纪俊玲

    2013-01-01

    Poly (hydroxybutyrate-co-hydroxyvalerate) (PHBV) fibrous membrances were prepared by electrospinning.The uniform PHBV fibers could be achieved through adding proper content ethanol.Used casting the PVA solution on PHBV membranes,the PHBV/PVA composite membrances were prepared.The effect of PVA concentration and volume on the performance of PHBV/PVA composite membrances were investigated.The results show that when PHBV/PVA (2/3) at 8% PVA,the permeate flux and rejection of PHBV/PVA composite membrances could reach 996 L/(m2 · h) and 86%,respectively.%采用静电纺方法制备聚羟基丁酸/戊酸酯共聚物(PHBV)纤维膜材料,通过调节纺丝液中无水乙醇的含量制备出形态均匀的PHBV静电纺纤维膜.用浇铸法将聚乙烯醇(PVA)涂敷在PHBV静电纺纤维膜上,制备PHBV/PVA复合膜,通过调节PVA的浓度及涂覆量,研究复合膜配比对其力学性能及过滤性能的影响.结果表明,当PVA浓度为8%,PHBV/PVA体积比为2/3时,得到最佳性能的PHBV/PVA复合膜,水通量达到996 L/(m2·h),截留率为86%.

  11. Fiber Optics Physics and Technology

    CERN Document Server

    Mitschke, Fedor

    2010-01-01

    Telephone, telefax, email and internet -- the key ingredient of the inner workings is the conduit: the line which is designed to carry massive amounts of data at breakneck speed. In their data-carrying capacity optical fiber lines beat other technologies (copper cable, microwave beacons, satellite links) hands down, at least in the long haul. This book tells you all you want to know about optical fibers: Their structure, their light-guiding mechanism, their material and manufacture, their use. Several effects tend to degrade the signal as it travels down the fiber: they are spelled out in detail. Nonlinear processes are given due consideration for a twofold reason: On the one hand they are fundamentally different from the more familiar processes in electrical cable. On the other hand, they form the basis of particularly interesting and innovative applications, provided they are understood well enough. A case in point is the use of so-called solitons, i.e. special pulses of light which have the wonderful prope...

  12. A novel fiber-based adsorbent technology

    Energy Technology Data Exchange (ETDEWEB)

    Reynolds, T.A. [Chemica Technologies, Inc., Bend, OR (United States)

    1997-10-01

    In this Phase I Small Business Innovation Research program, Chemica Technologies, Inc. is developing an economical, robust, fiber-based adsorbent technology for removal of heavy metals from contaminated water. The key innovation is the development of regenerable adsorbent fibers and adsorbent fiber cloths that have high capacity and selectivity for heavy metals and are chemically robust. The process has the potential for widespread use at DOE facilities, mining operations, and the chemical process industry.

  13. Fiber Optic Communications Technology. A Status Report.

    Science.gov (United States)

    Hull, Joseph A.

    Fiber optic communications (communications over very pure glass transmission channels of diameter comparable to a human hair) is an emerging technology which promises most improvements in communications capacity at reasonable cost. The fiber transmission system offers many desirable characteristics representing improvements over conventional…

  14. Developments in distributed optical fiber detection technology

    Science.gov (United States)

    Ye, Wei; Zhu, Qianxia; You, Tianrong

    2014-12-01

    The distributed optical fiber detection technology plays an important role in many fields, such as key regional security monitoring, pipeline maintenance and communication cable protection. It is superior to the traditional detector, and has a good prospect. This paper presents an overview of various distributed optical fiber sensors. At first, some related technologies of the optical fiber detection schemes are introduced in respect of sensing distance, real-time ability, signal strength, and system complexity; and the advantages and limitations of fiber gratings sensors, reflection-based optical fiber sensors, and interference- based optical fiber sensors are discussed. Then some advanced distributed optical fiber detection systems are mentioned. And the double-loop Sagnac distributed system is improved by adding photoelectric modulators and depolarizers. In order to denoise and enhance the original signal, a spectral subtraction-likelihood ratio method is improved. The experiment results show the spatial resolution is +/-15m per kilometer. Finally, based on the development trends of optical fiber detection technology at home and abroad, development tendency and application fields are predicted.

  15. Advanced radio over fiber network technologies.

    Science.gov (United States)

    Novak, Dalma; Waterhouse, Rod

    2013-09-23

    The evolution of wireless communication networks supporting emerging broadband services and applications offers new opportunities for realizing integrated optical and wireless network infrastructures. We report on some of our recent activities investigating advanced technologies for next generation converged optical wireless networks. Developments in Active Antenna Systems, mobile fronthaul architectures, and 60 GHz fiber distributed wireless networks are described. We also discuss the potential for analog radio over fiber distribution links as a viable solution for meeting the capacity requirements of new network architectures.

  16. Technology and applications of ultrafast fiber lasers

    Science.gov (United States)

    Lang, Marion; Hellerer, Thomas; Stuhler, Juergen

    2012-03-01

    We briefly review the key technology of modern fiber based femtosecond laser sources summarizing advantages and disadvantages of different mode-locking solutions. A description of possible extensions of a FemtoFiber-type modelocked Er-doped fiber laser oscillator (1560 nm) reveals the flexibility with respect to wavelength coverage (488 nm .. 2200 nm) and pulse duration (10 fs .. 10 ps). The resulting FemtoFiber family and its versions for instrument integration allow one to use these state-of-the-art light sources in many important applications, e.g. THz spectroscopy and microscopy. We show that, depending on the fiber laser model and the THz emitter, THz radiation can be produced with 4-10 THz bandwidth and detected with up to 60 dB signal-to-noise ratio (SNR). Electronically controlled optical scanning (ECOPS) - a unique method for fast, precise and comfortable sampling of the THz pulse or other pump-probe experiments - is described and recommended for efficient data acquisition. As examples for modern microscopy with ultrafast fiber lasers we present results of two-photon fluorescence, coherent microscopy techniques (SHG/THG/CARS) and fluorescence lifetime imaging (FLIM).

  17. Optical fiber sensing technology in the pipeline industry

    Energy Technology Data Exchange (ETDEWEB)

    Braga, A.M.B.; Llerena, R.W.A. [Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil). Dept. de Engenharia Mecanica]. E-mail: abraga@mec.puc-rio.br; roberan@mec.puc-rio.br; Valente, L.C.G.; Regazzi, R.D. [Gavea Sensors, Rio de Janeiro, RJ (Brazil)]. E-mail: guedes@gaveasensors.com; regazzi@gaveasensors.com

    2003-07-01

    This paper is concerned with applications of optical fiber sensors to pipeline monitoring. The basic principles of optical fiber sensors are briefly reviewed, with particular attention to fiber Bragg grating technology. Different potential applications in the pipeline industry are discussed, and an example of a pipeline strain monitoring system based on optical fiber Bragg grating sensors is presented. (author)

  18. Enabling technologies for fiber optic sensing

    Science.gov (United States)

    Ibrahim, Selwan K.; Farnan, Martin; Karabacak, Devrez M.; Singer, Johannes M.

    2016-04-01

    In order for fiber optic sensors to compete with electrical sensors, several critical parameters need to be addressed such as performance, cost, size, reliability, etc. Relying on technologies developed in different industrial sectors helps to achieve this goal in a more efficient and cost effective way. FAZ Technology has developed a tunable laser based optical interrogator based on technologies developed in the telecommunication sector and optical transducer/sensors based on components sourced from the automotive market. Combining Fiber Bragg Grating (FBG) sensing technology with the above, high speed, high precision, reliable quasi distributed optical sensing systems for temperature, pressure, acoustics, acceleration, etc. has been developed. Careful design needs to be considered to filter out any sources of measurement drifts/errors due to different effects e.g. polarization and birefringence, coating imperfections, sensor packaging etc. Also to achieve high speed and high performance optical sensing systems, combining and synchronizing multiple optical interrogators similar to what has been used with computer/processors to deliver super computing power is an attractive solution. This path can be achieved by using photonic integrated circuit (PIC) technology which opens the doors to scaling up and delivering powerful optical sensing systems in an efficient and cost effective way.

  19. Fiber distributed data interface [FDDI] technology report

    CERN Document Server

    2013-01-01

    Please note this is a Short Discount publication. Fiber Distributed Data Interface [FDDI] is the American National Standard Institute's proposed standard for a 100 Mbps token-passing ring using an optical fibre medium. The FDDI standard has become a focal point for optical technology application in the LAN environment. The market place is filling with products in every category from complete systems to optical transceivers. The 1990s see FDDI as the predominant high speed LAN and backbone. The latest edition of this report is thoroughly updated and gives a complete overview of FDDI technol

  20. Overview of fiber optics technology :industrial and military

    OpenAIRE

    Derrington, Dolores Cormack

    1989-01-01

    Fiber optics technology is being used in many applications, both in the military world and in the industrial world. A broad overview of this technology is provided, including a discussion of the fundamentals of fiber operation and component characteristics. Applications of fiber optics in both military and industrial communities is addressed, identifying specific examples in both cases. In addition, market projections and technology trends are discussed for both the milit...

  1. High Precision Fiber SINS with Spin Technology

    Institute of Scientific and Technical Information of China (English)

    孙伟; 孙枫; 王大雪

    2013-01-01

    Fiber strapdown inertial navigation system (FSINS) is presently used in several applications related to marine navigation. However, the absolute position from FSINS contains the error that increases with time, which prevents its long-term use for the ship cruise. In order to improve the performance of FSINS based on our present inertial sensors, the spin technology was proposed in the system to mitigate the navigation errors and a prototype of the proposed system was developed in Navigation Lab. The prototype contains the IMU, temperature controller, rotating configuration, navigation and I/O electronics group, control and display, power supply subsystem and other modules. In the proposed spin technology, the IMU is rotated back and forth in azimuth through four orthogonal positions relative to the ship’s longitudinal axis. Experimental testing was conducted for the prototype in the laboratory and the results showed that the RFSINS’s navigation performance is improved 10 times.

  2. Reviews of computing technology: Fiber distributed data interface

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, A.J.

    1992-04-01

    This technology report describes Fiber Distributed Data Interface (FDDI) as a technology, looks at the applications of this technology, examines the current economics of using it, and describe activities and plans by the Information Resource Management Department to implement this technology at the Savannah River Site.

  3. Reviews of computing technology: Fiber distributed data interface. Revision

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, A.J.

    1992-04-01

    This technology report describes Fiber Distributed Data Interface (FDDI) as a technology, looks at the applications of this technology, examines the current economics of using it, and describe activities and plans by the Information Resource Management Department to implement this technology at the Savannah River Site.

  4. RADIO OVER FIBER TECHNOLOGY USING ELECTRO-ABSORPTION MODULATION

    Directory of Open Access Journals (Sweden)

    SAURABH R. PRASAD

    2010-10-01

    Full Text Available The demand for bandwidth is increasing vigorously. Thus wired network is using fiber optic telephone line instead of coaxial cable. The concept of Fiber to the Home (FTTH is really coming into picture. Few countries like Japan, Korea etc are leading in this technology. But now the major challenge is how to provide the high speed internet connection wirelessly. Thus the change is to integrate the wireless and optical fiber communication.

  5. Military Applications of Fiber Optics Technology

    Science.gov (United States)

    1989-05-01

    I. P., D. Marcuse , and H.M. Presby, "Multimode Fiber Bandwidth: Theory and Practice," Proceedings of the IEEE, Vol. 68 , No. 10, October 1980, pp...Li, Tingye, "Structures, Parameters, and Transmission Properties of Optical Fibers," Proceedings of the IEEE, Vol. 68 , No. 10, October 1980, pp. 1175...121. Sigel, George H., Jr., "Fiber Transmission Losses in High-Radiation Fields," Proceedings of the IEEE, Vol. 68 , No. 10, October 1980, pp. 1236

  6. Silica optical fiber technology for devices and components design, fabrication, and international standards

    CERN Document Server

    Oh, Kyunghwan

    2012-01-01

    From basic physics to new products, Silica Optical Fiber Technology for Device and Components examines all aspects of specialty optical fibers. Moreover, the inclusion of the latest international standards governing optical fibers enables you to move from research to fabrication to commercialization. Reviews all the latest specialty optical fiber technologies, including those developed for high capacity WDM applications; broadband fiber amplifiers; fiber filleters based on periodic coupling; fiber branching devices; and fiber terminations Discusses key differences among sing

  7. Domestic Enterprise Awarded Overseas Patents On Fiber Optical Technologies

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Beijing Aerospace Times Optical-Electronic Technology Corp. Ltd was granted a patent for a fiber optical gyroscope using a low-polarization and polarization-maintaining hybrid light path in Ukraine. After filling an ordinary patent application for the technology domestically in 2006, the company filed a Paris Convention application in Ukraine to collaborate with a Ukrainian technical center in 2007.

  8. Ultrafast fiber beam delivery: system technology and industrial application

    Science.gov (United States)

    Funck, Max C.; Eilzer, Sebastian; Wedel, Björn

    2017-02-01

    Flexible beam delivery of high power pico- and femtosecond pulses offers great advantages in industrial applications. Complex free space beam delivery as found in robot or gantry systems can be replaced, laser safety and uptime increased and system integration in production environment simplified. Only recently fiber beam delivery has become available for ultrafast lasers while it has been an established standard for cw and pulsed laser sources for many years. Using special kinds of fiber that guide the laser beam mostly inside a hollow core, nonlinear effects and catastrophic damage that would arise in conventional glass fibers can be avoided. Today, ultrafast pulses with several 100 μJ and hundreds of MW can be transmitted in quasi single mode fashion with micro-structured hollow core fibers. During the last years we have developed a modular beam delivery system that suits industrial ultrafast lasers and can be integrated into existing processing machines. Micro-structured hollow core fibers inside the sealed laser light cable efficiently guide high-power laser pulses over distances of several meters with excellent beam quality, while power, pulse duration and polarization are maintained. We report on the technology required for fiber beam delivery of ultrafast laser pulses and discuss requirements for successful integration into industrial production as well as achievable performance under realistic operation and show examples of micromachining applications.

  9. Thin film technologies for optoelectronic components in fiber optic communication

    Science.gov (United States)

    Perinati, Agostino

    1998-02-01

    'The Asian Routes Towards the Global Information Society' and 'Towards a Strategic Planning for the Global Information Society' will be the forum themes of 'Asia Telecom 97' and 'Telecom Interactice 97' events respectively, to be held by the International Telecommunication Union (ITU) in order to further telecommunication development around the world. International telecommunications network affects our life by keeping us in touch, bringing us world news and underpinning the global economy. Global tele-economy, global information infrastructure, global information society terms are more and more used to indicate the evolution towards an information- driven world where the access to information, communication and technologies is essential to the economic and social development in every country. Telecommunication industry can strongly contribute to this evolution together with broadcasting and computer industry, and fiber optic communications are expected to continue to grow up and share a relevant part of the total telecom market. In 1995 telecom market shown a 3.8 percent worldwide investment growth reaching a 545 billion value. According to 'Kessler Marketing Intelligence (KMI) Corp.' analysis of fiberoptics and multimedia market the amount of cabled fiber installed in U.S. will be around 11 million fiber-km in 1997 and 15 million fiber-km are predicted in the year 2000. Between 1995 and 1998 the undersea industry is estimated to deal with 13.9 billion as additional undersea cable systems investment in the global telecom network. In China beside satellite telecom stations and digital microwave systems 22 fiber optic backbones have been realized and another 23 systems are expected to be built in the Ninth Five-Year National Plan (1996 to approximately 2000) with a total length of nearly 30,000 sheat-km. The study, Fiber and Fiberoptic Cable Markets in China, recently released by KMI Corp. shows that fiber optic cable installation by MPT and other network operators

  10. Fiber-reinforced technology in multidisciplinary chairside approaches

    Directory of Open Access Journals (Sweden)

    Arhun Neslihan

    2008-01-01

    Full Text Available There is an increasing demand to improve dentofacial esthetics in the adult population. This demand usually requires a close collaboration within the various disciplines of dentistry and the patient at every stage of the therapy. The materials and techniques used by these interdisciplinary clinicians must be conservative and minimally invasive. Fiber-reinforced composite technology offers such solutions for chairside applications. This case report presents two cases where fiber-reinforced ribbon and composite complex was used in a multidisciplinary approach to improve esthetics.

  11. 78 FR 17187 - Notice of Intent To Grant Exclusive Patent License; Fiber Optic Sensor Systems Technology...

    Science.gov (United States)

    2013-03-20

    ... Department of the Navy Notice of Intent To Grant Exclusive Patent License; Fiber Optic Sensor Systems... to grant to Fiber Optic Sensor Systems Technology Corporation, a revocable, nonassignable, exclusive... its intent to grant to Fiber Optic Sensor Systems Technology Corporation a revocable, nonassignable...

  12. Effect of technological parameters on optical performance of fiber coupler

    Institute of Scientific and Technical Information of China (English)

    SHUAI Ci-jun; DUAN Ji-an; ZHONG Jue

    2007-01-01

    To find out the influence of technological parameters on optical performance of fused optical fiber device, the fiber coupler was served as subject investigated by using the fused biconical taper machining as experimental setup. Fused fiber coupler's optical performances such as insertion loss, excess loss, directivity and uniformity were tested with the optical test system that was constituted of tunable laser and optical spectrum analyzer. Especially the relationship between optical performance and drawing speed was investigated. The experimental results show that the optical performance is closely related to process conditions. At fused temperature of 1 200℃, there exists a drawing speed of 150 μm/s, which makes the device's performance optimum. Out of this speed region, the optical performance drops quickly. At drawing speed of 200 tm/s, the excess loss is relatively small when the fused temperature is above 1 200℃. So the technological parameters have close relationship with optical performance of the coupler, and the good performance coupler can't get until the drawing speed and fused temperature match accurately.

  13. OPTICAL FIBER SENSOR TECHNOLOGIES FOR EFFICIENT AND ECONOMICAL OIL RECOVERY

    Energy Technology Data Exchange (ETDEWEB)

    Anbo Wang; Kristie L. Cooper; Gary R. Pickrell

    2003-06-01

    Efficient recovery of petroleum reserves from existing oil wells has been proven to be difficult due to the lack of robust instrumentation that can accurately and reliably monitor processes in the downhole environment. Commercially available sensors for measurement of pressure, temperature, and fluid flow exhibit shortened lifetimes in the harsh downhole conditions, which are characterized by high pressures (up to 20 kpsi), temperatures up to 250 C, and exposure to chemically reactive fluids. Development of robust sensors that deliver continuous, real-time data on reservoir performance and petroleum flow pathways will facilitate application of advanced recovery technologies, including horizontal and multilateral wells. This is the final report for the four-year program ''Optical Fiber Sensor Technologies for Efficient and Economical Oil Recovery'', funded by the National Petroleum Technology Office of the U.S. Department of Energy, and performed by the Center for Photonics Technology of the Bradley Department of Electrical and Computer Engineering at Virginia Tech from October 1, 1999 to March 31, 2003. The main objective of this research program was to develop cost-effective, reliable optical fiber sensor instrumentation for real-time monitoring of various key parameters crucial to efficient and economical oil production. During the program, optical fiber sensors were demonstrated for the measurement of temperature, pressure, flow, and acoustic waves, including three successful field tests in the Chevron/Texaco oil fields in Coalinga, California, and at the world-class oil flow simulation facilities in Tulsa, Oklahoma. Research efforts included the design and fabrication of sensor probes, development of signal processing algorithms, construction of test systems, development and testing of strategies for the protection of optical fibers and sensors in the downhole environment, development of remote monitoring capabilities allowing real

  14. OPTICAL FIBER SENSOR TECHNOLOGIES FOR EFFICIENT AND ECONOMICAL OIL RECOVERY

    Energy Technology Data Exchange (ETDEWEB)

    Kristie Cooper; Gary Pickrell; Anbo Wang

    2003-04-01

    This report summarizes technical progress over the fourth year of the ''Optical Fiber Sensor Technologies for Efficient and Economical Oil Recovery'' program, funded by the Federal Energy Technology Center of the U.S. Department of Energy, and performed by the Center for Photonics Technology of the Bradley Department of Electrical and Computer Engineering at Virginia Tech. During the reporting period, research efforts under the program were focused on the development and evaluation of the fiber optic flow sensor system, and field testing in Tulsa, OK and the second field test of the pressure and temperature sensors in Coalinga, CA. The feasibility of a self-compensating fiber optic flow sensor based on a cantilever beam and interferometer for real-time flow rate measurements in the fluid filled pipes of oil field was clearly demonstrated. In addition, field testing of the pressure and temperature sensors deployed downhole continued. These accomplishments are summarized here: (1) Theoretical analysis and simulations were performed to ensure performance of the design. (2) The sensor fabrication and packaging techniques were investigated and improved. (3) Prototype flow sensors were fabricated based on the fabrication experience of hundreds of test sensors. (4) A lab-scale flow testing system was constructed and used for sensor evaluation. (5) Field-testing was performed in both the indoor and outdoor flow testing facility at the University of Tulsa, OK. (6) Testing of a multimode white light pressure and temperature sensor system continued at the oil site of Chevron/Texaco Company (Coalinga CA).

  15. Fabrication technology of integrated fiber microfluidic electrophoresis chip

    Institute of Scientific and Technical Information of China (English)

    LI MengChun

    2007-01-01

    The technology of PCB was used to fabricate the chip mould, and the microfluidic electrophoresis chip was fabricated with PDMS material. The fiber integrated on the chip was used as the transmission medium, so the light spot size was near the depth of microchannel. The detection sensitivity was improved, and the optical focusing system was spared. The fabrication process, sealing methods and structure characteristic of PDMS microfluidic electrophoresis chips were discussed. The experiment was achieved by using the fabricated chip to separate FITC fluorescein and FITC-labeled amino acid mixture reagent, and the feasibility of the chip was validated.

  16. Few-mode fiber technology for mode division multiplexing

    Science.gov (United States)

    Mori, Takayoshi; Sakamoto, Taiji; Wada, Masaki; Yamamoto, Takashi; Nakajima, Kazuhide

    2017-02-01

    We review recent progress on few-mode fiber (FMF) technologies for mode-division multiplexing (MDM) transmission. First, we introduce fibers for use without and with multiple-input multiple-output (MIMO) digital signal processing (DSP) to compensate for modal crosstalk, and briefly report recent work on FMF for use without/with a MIMO DSP system. We next discuss in detail a fiber for MIMO transmission systems, and show numerically that a graded-index core can flexibly tune the differential mode group delay (DMD) and a cladding trench can flexibly control the guiding mode number. We optimized the spacing of the core and trench. Accordingly, we can achieve a 6 LP (10 spatial) mode operation and a low DMD while preventing the high index difference that leads to manufacturing difficulties and any loss increase. We finally describe our experimental results for a 6 LP (10 spatial) mode transmission line for use in a C + L band wavelength-division multiplexing (WDM) MDM transmission with MIMO DSP.

  17. Application and the key technology on high power fiber-optic laser in laser weapon

    Science.gov (United States)

    Qu, Zhou; Li, Qiushi; Meng, Haihong; Sui, Xin; Zhang, Hongtao; Zhai, Xuhua

    2014-12-01

    The soft-killing laser weapon plays an important role in photoelectric defense technology. It can be used for photoelectric detection, search, blinding of photoelectric sensor and other devices on fire control and guidance devices, therefore it draws more and more attentions by many scholars. High power fiber-optic laser has many virtues such as small volume, simple structure, nimble handling, high efficiency, qualified light beam, easy thermal management, leading to blinding. Consequently, it may be used as the key device of soft-killing laser weapon. The present study introduced the development of high power fiber-optic laser and its main features. Meanwhile the key technology of large mode area (LMA) optical fiber design, the beam combination technology, double-clad fiber technology and pumping optical coupling technology was stated. The present study is aimed to design high doping LMA fiber, ensure single mode output by increasing core diameter and decrease NA. By means of reducing the spontaneous emission particle absorbed by fiber core and Increasing the power density in the optical fiber, the threshold power of nonlinear effect can increase, and the power of single fiber will be improved. Meantime, high power will be obtained by the beam combination technology. Application prospect of high power fiber laser in photoelectric defense technology was also set forth. Lastly, the present study explored the advantages of high power fiber laser in photoelectric defense technology.

  18. Fiber-Reinforced-Foam (FRF) Core Composite Sandwich Panel Concept for Advanced Composites Technologi

    Science.gov (United States)

    2010-01-01

    Fiber-Reinforced-Foam (FRF) Core Composite Sandwich Panel Concept for Advanced Composites Technologies Project - Preliminary Manufacturing Demonstration Articles for Ares V Payload Shroud Barrel Acreage Structure

  19. 75 FR 34988 - Notice of Intent To Grant Exclusive Patent License; Fiber Optic Sensor Systems Technology...

    Science.gov (United States)

    2010-06-21

    ... Department of the Navy Notice of Intent To Grant Exclusive Patent License; Fiber Optic Sensor Systems... Navy hereby gives notice of its intent to grant to Fiber Optic Sensor Systems Technology Corporation a.... Patent No. 7,149,374: Fiber Optic Pressure Sensor, Navy Case No. 84,557.//U.S. Patent No. 7,379,630...

  20. 77 FR 73456 - Notice of Intent To Grant Exclusive Patent License; Fiber Optic Sensor Systems Technology...

    Science.gov (United States)

    2012-12-10

    ... Department of the Navy Notice of Intent To Grant Exclusive Patent License; Fiber Optic Sensor Systems... Navy hereby gives notice of its intent to grant to Fiber Optic Sensor Systems Technology Corporation a... described in U.S. Patent No. 7,020,354: Intensity Modulated Fiber Optic Pressure Sensor, Navy Case No. 83...

  1. Study on the Process Technology of PA6/PET Bicomponent Fiber

    Institute of Scientific and Technical Information of China (English)

    林耀

    2001-01-01

    PA6/PET bicomponent fiber at different spinning speedswere produced. Influences of cross blowing, spinning speed, PA6 and PET component ratio, drawing condition etc. on the mechanical properties, heat shrinkage,orientation and crystallization of the fiber were investigated. Also the rules among these influencing parameters were obtained. The splitting property of the fiber and its influence on the textile processing are discussed, which offers a base for the production of PA6/PET bicomponent fiber using splitting technology.

  2. Interrogating adhesion using fiber Bragg grating sensing technology

    Science.gov (United States)

    Rasberry, Roger D.; Rohr, Garth D.; Miller, William K.; Udd, Eric; Blach, Noah T.; Davis, Ryan A.; Olson, Walter R.; Calkins, David; Roach, Allen R.; Walsh, David S.; McElhanon, James R.

    2015-05-01

    The assurance of the integrity of adhesive bonding at substrate interfaces is paramount to the longevity and sustainability of encapsulated components. Unfortunately, it is often difficult to non-destructively evaluate these materials to determine the adequacy of bonding after manufacturing and then later in service. A particularly difficult problem in this regard is the reliable detection/monitoring of regions of weak bonding that may result from poor adhesion or poor cohesive strength, or degradation in service. One promising and perhaps less explored avenue we have recently begun to investigate for this purpose centers on the use of (chirped) fiber Bragg grating sensing technology. In this scenario, a grating is patterned into a fiber optic such that a (broadband) spectral reflectance is observed. The sensor is highly sensitive to local and uniform changes across the length of the grating. Initial efforts to evaluate this approach for measuring adhesive bonding defects at substrate interfaces are discussed. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.

  3. Linearization Technologies for Broadband Radio-Over-Fiber Transmission Systems

    Directory of Open Access Journals (Sweden)

    Xiupu Zhang

    2014-11-01

    Full Text Available Linearization technologies that can be used for linearizing RoF transmission are reviewed. Three main linearization methods, i.e. electrical analog linearization, optical linearization, and electrical digital linearization are presented and compared. Analog linearization can be achieved using analog predistortion circuits, and can be used for suppression of odd order nonlinear distortion components, such as third and fifth order. Optical linearization includes mixed-polarization, dual-wavelength, optical channelization and the others, implemented in optical domain, to suppress both even and odd order nonlinear distortion components, such as second and third order. Digital predistortion has been a widely used linearization method for RF power amplifiers. However, digital linearization that requires analog to digital converter is severely limited to hundreds of MHz bandwidth. Instead, analog and optical linearization provide broadband linearization with up to tens of GHz. Therefore, for broadband radio over fiber transmission that can be used for future broadband cloud radio access networks, analog and optical linearization are more appropriate than digital linearization. Generally speaking, both analog and optical linearization are able to improve spur-free dynamic range greater than 10 dB over tens of GHz. In order for current digital linearization to be used for broadband radio over fiber transmission, the reduced linearization complexity and increased linearization bandwidth are required. Moreover, some digital linearization methods in which the complexity can be reduced, such as Hammerstein type, may be more promising and require further investigation.

  4. State-of-the-art of fiber-reinforced polymers in additive manufacturing technologies

    DEFF Research Database (Denmark)

    Hofstätter, Thomas; Pedersen, David Bue; Tosello, Guido

    2017-01-01

    Additive manufacturing technologies have received a lot of attention in recent years for their use in multiple materials such as metals, ceramics, and polymers. The aim of this review article is to analyze the technology of fiber-reinforced polymers and its implementation with additive...... manufacturing. This article reviews recent developments, ideas, and state-of-the-art technologies in this field. Moreover, it gives an overview of the materials currently available for fiber-reinforced material technology....

  5. Technology Development Road for Chemical Fiber Industry in Ghina [Part Two

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ Ⅲ.Technology development direction for China's chemical fiber industry in the"11th Five-year Plan" period and the longer run Presently,China's chemical fiber industry is in a critical period for development,or important transition period.Fully implement and fulfill the "'scientific development concept"put forward by the nation,and take a sustainable development road.The growth model of chemical fiber industry must undergo fundamental transformation from "quantitative"development into "qualitative" development.

  6. Development of composition and technology of dairy dessert with carrot fiber

    OpenAIRE

    M. S. Belozerova; T. N. Evstigneeva; A. A. Grigoreva

    2016-01-01

    The development of modern traditional technologies of processing of plant raw material leads to a reduction of content in it of fiber. In this regard, it becomes necessary to create a category of products, which are additionally introduced functional ingredients. Conducted researches on studying possibility of using the carrot fiber in the production of dairy products in order to enrich the composition of them dietary fiber. At the initial stage of the study determined the effect of temperatu...

  7. OPTICAL FIBER SENSOR TECHNOLOGIES FOR EFFICIENT AND ECONOMICAL OIL RECOVERY

    Energy Technology Data Exchange (ETDEWEB)

    A. Wang; H. Xiao; R. May

    1999-10-29

    Efficient and complete recovery of petroleum reserves from existing oil wells has proven difficult due to a lack of robust instrumentation that can monitor processes in the downhole environment. Commercially available sensors for measurement of pressure, temperature, and fluid flow exhibit shortened lifetimes in the harsh downhole conditions, which are characterized by high pressures (up to 20 kpsi), temperatures up to 250 C, and exposure to chemically reactive fluids. Development of robust sensors that deliver continuous, real-time data on reservoir performance and petroleum flow pathways will facilitate application of advanced recovery technologies, including horizontal and multi-lateral wells. The main objective of the research program is to develop cost-effective, reliable fiber sensor instrumentation for real-time monitoring and /or control of various key parameters crucial to efficient and economical oil production. This report presents the detailed research work and technical progress from October 1, 1998 to September 30, 1999. The research performed over the first year of the program has followed the schedule as proposed, and solid research progress has been made in specification of the technical requirements, design and fabrication of the SCIIB sensor probes, development of the sensor systems, development of DSP-based signal processing techniques, and construction of the test systems. These technical achievements will significantly help to advance continued research on sensor tests and evaluation during the second year of the program.

  8. US long distance fiber optic networks: Technology, evolution and advanced concepts. Volume 1: Executive summary

    Science.gov (United States)

    1986-01-01

    Over the past two decades, fiber optics has emerged as a highly practical and cost-efficient communications technology. Its competitiveness vis-a-vis other transmission media, especially satellite, has become a critical question. This report studies the likely evolution and application of fiber optic networks in the United States to the end of the century. The outlook for the technology of fiber systems is assessed and forecast, scenarios of the evolution of fiber optic network development are constructed, and costs to provide service are determined and examined parametrically as a function of network size and traffic carried. Volume 1 consists of the Executive Summary. Volume 2 focuses on fiber optic technology and long distance fiber optic networks. Volume 3 develops a traffic and financial model of a nationwide long distance transmission network. Among the study's most important conclusions are: revenue requirements per circuit for LATA-to-LATA fiber optic links are less than one cent per call minute; multiplex equipment, which is likely to be required in any competing system, is the largest contributor to circuit costs; the potential capacity of fiber optic cable is very large and as yet undefined; and fiber optic transmission combined with other network optimization schemes can lead to even lower costs than those identified in this study.

  9. Novel Tunable PMD Compensation Technology Using Linear Chirped Fiber Bragg Grating

    Institute of Scientific and Technical Information of China (English)

    LIU Yu-min; YU Zhong-yuan; YANG Hong-bo; ZHANG Xiao-guang; YANG Bo-jun

    2004-01-01

    Based on uniform fiber Bragg grating bonded with a magnetostrictive rod in the non-uniform magnetic field, a novel PMD compensation technique is proposed. This all- fiber PMD compensation technology is cost-effective and flexible in designing the differential group delay profile.

  10. Laser Communications and Fiber Optics Lab Manual. High-Technology Training Module.

    Science.gov (United States)

    Biddick, Robert

    This laboratory training manual on laser communications and fiber optics may be used in a general technology-communications course for ninth graders. Upon completion of this exercise, students achieve the following goals: match concepts with laser communication system parts; explain advantages of fiber optic cable over conventional copper wire;…

  11. Hollow fiber bioreactor technology for tissue engineering applications.

    Science.gov (United States)

    Eghbali, Hadis; Nava, Michele M; Mohebbi-Kalhori, Davod; Raimondi, Manuela T

    2016-01-01

    Hollow fiber bioreactors are the focus of scientific research aiming to mimic physiological vascular networks and engineer organs and tissues in vitro. The reason for this lies in the interesting features of this bioreactor type, including excellent mass transport properties. Indeed, hollow fiber bioreactors allow limitations to be overcome in nutrient transport by diffusion, which is often an obstacle to engineer sizable constructs in vitro. This work reviews the existing literature relevant to hollow fiber bioreactors in organ and tissue engineering applications. To this purpose, we first classify the hollow fiber bioreactors into 2 categories: cylindrical and rectangular. For each category, we summarize their main applications both at the tissue and at the organ level, focusing on experimental models and computational studies as predictive tools for designing innovative, dynamic culture systems. Finally, we discuss future perspectives on hollow fiber bioreactors as in vitro models for tissue and organ engineering applications.

  12. Review on an Advanced High-Temperature Measurement Technology: The Optical Fiber Thermometry

    Directory of Open Access Journals (Sweden)

    Y. B. Yu

    2009-01-01

    Full Text Available Optical fiber thermometry technology for high-temperature measurement is briefly reviewed in this paper. The principles, characteristics, recent progresses and advantages of the technology are described. Examples of using the technology are introduced. Many blackbody, infrared, and fluorescence optical thermometers are developed for practical applications.

  13. Preparation of A New Fiber by Sol-gel Technology in Solid-phase Microextraction (SPME)

    Institute of Scientific and Technical Information of China (English)

    Li Ming WEI; Qing Yu OU; Ju Bai LI

    2004-01-01

    The sol-gel technology is applied for the preparation of solid-phase microextraction (SPME) fiber. The fiber demonstrates high thermal stability, efficient extraction rate and the selectivity for non-polar or low-polar analytes. Efficient SPME-GC-FID analyses of benzene- toluene-ethylbenzene-xylenes (BTEXs) and low-polar halocarbon were achieved by the sol-gel coated DSDA-DDBT-TiO2 fiber. Some parameters of the SPME fiber for the determination of halocarbon in aqueous sample were investigated.

  14. Effects of Process Technology on Structure and Properties of HMLS Fibers

    Institute of Scientific and Technical Information of China (English)

    王学利; 王彪; 王华平; 张玉梅; 胡学超

    2001-01-01

    High modulus low shrinkage (HMLS) fibers have been prepared by using higher viscosity PET chips. The effects of the process conditions on their structure and properties have been studied by various testing techniques. The results show that the suitable spinning speed for preparing of HMLS fibers is 2 000 ~ 2 800 m/min. With the increase of the spinning speed, the density, crystallinity, and birefringence of the initial fibers increase obviously, but the shrinkage ratio decreases rapidly. The effects of process technology on properties of the HMLS fibers have also been discussed.

  15. Basalt fiber manufacturing technology and the possibility of its use in dentistry

    Science.gov (United States)

    Karavaeva, E.; Rogozhnikov, A.; Nikitin, V.; Cherepennikov, Yu; Lysakov, A.

    2015-11-01

    The article touches upon the technology of basalt fiber manufacturing and prospects of its use in dental practice. Two kinds of construction using basalt fiber have been proposed. The first one is a splinting construction for mobile teeth and the second one is the reinforced base for removable plate-denture. The work presents the results of the investigation of physical and mechanical properties of the constructions based on basalt fiber. It also describes the aspects of biomechanical modeling of such constructions in the ANSYS software package. The results of the investigation have proved that applying constructions using basalt fiber is highly promising for prosthetic dentistry practice.

  16. Optimizing Fiber Topologies for WDM Optical Networks Based on Multi-Granularity Optical Switching Technology

    Institute of Scientific and Technical Information of China (English)

    LI Junjie; ZHOU Bingkun; ZHANG Hanyi; LI Yanhe

    2006-01-01

    For the quality of service (QoS) and fairness considerations, the hop counts of various lightpaths in a wavelength division multiplexing (WDM) optical network should be short and compact. The development of multi-granularity optical switching technology has made it possible to construct various fiber topologies over a fixed physical topology. This paper describes a fiber topology design (FTD) problem, which minimizes the maximum number of required fibers in the physical links for a maximum lightpath hop count in the fiber topology. After the formular description for the FTD problem, a method was given to obtain the lower bound on the maximum number of required fibers. For large or moderate scale networks, three heuristic algorithms are given to efficiently solve the FTD problem. This study gives a new way to optimize the resource configuration performance in WDM optical networks at the topology level and proves its effectiveness via both analyses and numerical experiments.

  17. Structural health monitoring of civil infrastructure using optical fiber sensing technology: a comprehensive review.

    Science.gov (United States)

    Ye, X W; Su, Y H; Han, J P

    2014-01-01

    In the last two decades, a significant number of innovative sensing systems based on optical fiber sensors have been exploited in the engineering community due to their inherent distinctive advantages such as small size, light weight, immunity to electromagnetic interference (EMI) and corrosion, and embedding capability. A lot of optical fiber sensor-based monitoring systems have been developed for continuous measurement and real-time assessment of diversified engineering structures such as bridges, buildings, tunnels, pipelines, wind turbines, railway infrastructure, and geotechnical structures. The purpose of this review article is devoted to presenting a summary of the basic principles of various optical fiber sensors, innovation in sensing and computational methodologies, development of novel optical fiber sensors, and the practical application status of the optical fiber sensing technology in structural health monitoring (SHM) of civil infrastructure.

  18. Multi-element fiber technology for space-division multiplexing applications.

    Science.gov (United States)

    Jain, S; Rancaño, V J F; May-Smith, T C; Petropoulos, P; Sahu, J K; Richardson, D J

    2014-02-24

    A novel technological approach to space division multiplexing (SDM) based on the use of multiple individual fibers embedded in a common polymer coating material is presented, which is referred to as Multi-Element Fiber (MEF). The approach ensures ultralow crosstalk between spatial channels and allows for cost-effective ways of realizing multi-spatial channel amplification and signal multiplexing/demultiplexing. Both the fabrication and characterization of a passive 3-element MEF for data transmission, and an active 5-element erbium/ytterbium doped MEF for cladding-pumped optical amplification that uses one of the elements as an integrated pump delivery fiber is reported. Finally, both components were combined to emulate an optical fiber network comprising SDM transmission lines and amplifiers, and illustrate the compatibility of the approach with existing installed single-mode WDM fiber systems.

  19. Preparation of Porous Anodic Alumina Membrance on Glass Substrate%玻璃基底上多孔氧化铝模板的制备

    Institute of Scientific and Technical Information of China (English)

    李宏

    2014-01-01

    Al thin films were deposited by magnetron sputtering on the glass slide .And then , the porous anodic alumina membrance was fabricated by anodic oxidation in phosphate solution .Scanning electron micro-scope (SEM) showed that the highly ordered porous anodic alumina membrance without barrier layer was fabrica -ted under the condition of 195 V of voltage , 60 s of time .This method can be employed to prepare other kinds of nanostructures on the rigid substrates .%利用磁控溅射在玻璃基底上直接溅射一层铝薄膜,然后利用阳极氧化制备了多孔氧化铝模板,扫描电子显微镜图片显示在195V、60s的条件下获得的多孔氧化铝模板孔道排列规则,且双向贯通。这种方法为在玻璃等硬质基底上制备规则的纳米结构提供了一种有效途径。

  20. FORMING MECHANISM OF SILICA SOLS AND PROPERTIES OF SILICA MEMBRANCES%二氧化硅溶胶的形成与硅胶膜性能

    Institute of Scientific and Technical Information of China (English)

    杨亮亮; 殷明志; 常亮亮

    2011-01-01

    采取溶胶-凝胶成膜技术,以正硅酸乙酯(TEOS)为原料,分别以水为溶剂NH3催化、乙醇为溶剂HC1催化和冰醋酸为溶剂各自制备出粒状结构、簇状结构和网状结构的二氧化硅溶胶,丙三醇作为添加剂与TEOS水解中间体以氢键结合控制二氧化硅溶胶形态,聚乙烯醇(PVA)与二氧化硅溶胶形成有机/无机互穿网络结构,易于成膜.热处理能使二氧化硅凝胶薄膜中的添加剂逸出并形成疏松结构,塑性形变使硅胶薄膜形成多孔、疏松、致密结构二氧化硅薄膜.实验表明,催化剂和溶剂效应直接影响着二氧化硅溶胶微观结构,从而影响着所形成的硅胶薄膜的微结构.多孔硅胶膜的平衡吸湿量是致密硅胶薄膜的3倍;而疏松结构的硅胶薄膜的吸湿量高于多孔硅胶薄膜的吸湿量,且其吸附速率明显大于多孔硅胶薄膜的吸附速率.%Colloidal silica sol, clustered silica sol, and polymeric silica sol were made by sol-gel processes of tetraethylorthosilicate (TEOS) catalyzing with NH3-H2O in water, with HC1 in ethanol and in glacial acetic acid, respectively. Glycerol as a template combining with the hydrolyzing intermediates controlled the silica intermediate state, while poly(vinyl alcohol) (PVA) compatibilizing and cross-linking with silica polymers made the silica sol a co-polymeric and spinning easily. Heating processes made the gel silica membrances into loosen structure after the organic templates being escaped, and plastic deformation forced the silica gel membrances into microporous, loosen, and compact structure. The experiment results indicated microstructures of the silica membrances were affected by catalyst and solvent. Absorbed amount of the microporous silica membrances was triple that of the compact, while the loosen silica membrance's was more than that of the microporous and the absorbed ratio higher than that of the microporous.

  1. Application research on hydraulic coke cutting monitoring system based on optical fiber sensing technology

    Science.gov (United States)

    Zhong, Dong; Tong, Xinglin

    2014-06-01

    With the development of the optical fiber sensing technology, the acoustic emission sensor has become one of the focal research topics. On the basis of studying the traditional hydraulic coke cutting monitoring system, the optical fiber acoustic emission sensor has been applied in the hydraulic coke cutting monitoring system for the first time, researching the monitoring signal of the optical fiber acoustic emission sensor in the system. The actual test results show that using the acoustic emission sensor in the hydraulic coke cutting monitoring system can get the real-time and accurate hydraulic coke cutting state and the effective realization of hydraulic coke cutting automatic monitoring in the Wuhan Branch of Sinopec.

  2. Research of subdivision driving technology for brushless DC motors in optical fiber positioning

    Science.gov (United States)

    Kan, Yi; Gu, Yonggang; Zhu, Ye; Zhai, Chao

    2016-07-01

    In fiber spectroscopic telescopes, optical fiber positioning units are used to position thousands of fibers on the focal plane quickly and precisely. Stepper motors are used in existing units, however, it has some inherent deficiencies, such as serious heating and low efficiency. In this work, the universally adopted subdivision driving technology for stepper motors is transplanted to brushless DC motors. It keeps the advantages of stepper motors such as high positioning accuracy and resolution, while overcomes the disadvantages mentioned above. Thus, this research mainly focuses on develop a novel subdivision driving technology for brushless DC motor. By the proving of experiments of online debug and subdivision speed and position, the proposed brushless DC motor subdivision technology can achieve the expected functions.

  3. Ultrafast Optics: Vector Cavity Fiber Lasers - Physics and Technology

    Science.gov (United States)

    2016-06-14

    fiber lasers the effective cavity gain bandwidth could be far broader than the laser emission bandwidth, if the optical field is in resonance with the...periodic modulation on the CW laser field , where fc is the modulation frequency. Fig. 2.1 shows the evolution of the laser emission under existence of...real saturable absorber (SA) mode locking techniques, such as the carbon nanotube mode locking, 2D-nano-materials mode locking, formation of bound

  4. Development of composition and technology of dairy dessert with carrot fiber

    Directory of Open Access Journals (Sweden)

    M. S. Belozerova

    2016-01-01

    Full Text Available The development of modern traditional technologies of processing of plant raw material leads to a reduction of content in it of fiber. In this regard, it becomes necessary to create a category of products, which are additionally introduced functional ingredients. Conducted researches on studying possibility of using the carrot fiber in the production of dairy products in order to enrich the composition of them dietary fiber. At the initial stage of the study determined the effect of temperature and time of exposure to the swelling capacity of carrot fiber. Based on the organoleptic evaluation of various samples of dairy products with food fibers sour cream with fat mass fraction 20 and 25% is offered as a dairy basis for production of a dessert. The technique of introducing carrot fiber in a product is perfected and its optimal dose equal to 3% is selected. As a flavor filler used cocoa syrup, which is best combined with sour cream base. The research carried out to determine the ratio of cocoa powder and sugar in cocoa syrup, which will allow to obtain a product with a harmonious combination of the studied components. Flavoring fillers are chosen and the rational dose equal to 30% by weight of the product allowing to receive a dessert with high consumer properties is defined. It was found that it is expedient to introduce carrot fiber into the mixture to prepare syrup, because technological parameters of these transactions are almost similar. At the final stage of the study examined the effect of carrot fiber for a period of validity of the developed product. It was found that shelf life of developed product is not reduced compared with the control sample containing no dietary fibers.

  5. TECHNOLOGICAL ASPECTS OF MANUFACTURING SILICA OPTICAL FIBERS WITH LARGE CENTRAL DEFECT OF GRADED REFRACTIVE INDEX PROFILE FOR FIBER OPTIC SENSORS BASED ON FEW-MODE EFFECTS

    National Research Council Canada - National Science Library

    V V Demidov; E V Ter-Nersesyantz; A V Bourdine; V A Burdin; A Y Minaeva; A V Khokhlov; A V Komarov; S V Ustinov; K V Dukelskiy

    2017-01-01

    The paper deals with results of the study on the main technological aspects relating to a full production cycle of silica multimode graded-index fibers with the refractive index profile having central...

  6. Medical smart textiles based on fiber optic technology: an overview.

    Science.gov (United States)

    Massaroni, Carlo; Saccomandi, Paola; Schena, Emiliano

    2015-04-13

    The growing interest in the development of smart textiles for medical applications is driven by the aim to increase the mobility of patients who need a continuous monitoring of such physiological parameters. At the same time, the use of fiber optic sensors (FOSs) is gaining large acceptance as an alternative to traditional electrical and mechanical sensors for the monitoring of thermal and mechanical parameters. The potential impact of FOSs is related to their good metrological properties, their small size and their flexibility, as well as to their immunity from electromagnetic field. Their main advantage is the possibility to use textile based on fiber optic in a magnetic resonance imaging environment, where standard electronic sensors cannot be employed. This last feature makes FOSs suitable for monitoring biological parameters (e.g., respiratory and heartbeat monitoring) during magnetic resonance procedures. Research interest in combining FOSs and textiles into a single structure to develop wearable sensors is rapidly growing. In this review we provide an overview of the state-of-the-art of textiles, which use FOSs for monitoring of mechanical parameters of physiological interest. In particular we briefly describe the working principle of FOSs employed in this field and their relevant advantages and disadvantages. Also reviewed are their applications for the monitoring of mechanical parameters of physiological interest.

  7. Medical Smart Textiles Based on Fiber Optic Technology: An Overview

    Directory of Open Access Journals (Sweden)

    Carlo Massaroni

    2015-04-01

    Full Text Available The growing interest in the development of smart textiles for medical applications is driven by the aim to increase the mobility of patients who need a continuous monitoring of such physiological parameters. At the same time, the use of fiber optic sensors (FOSs is gaining large acceptance as an alternative to traditional electrical and mechanical sensors for the monitoring of thermal and mechanical parameters. The potential impact of FOSs is related to their good metrological properties, their small size and their flexibility, as well as to their immunity from electromagnetic field. Their main advantage is the possibility to use textile based on fiber optic in a magnetic resonance imaging environment, where standard electronic sensors cannot be employed. This last feature makes FOSs suitable for monitoring biological parameters (e.g., respiratory and heartbeat monitoring during magnetic resonance procedures. Research interest in combining FOSs and textiles into a single structure to develop wearable sensors is rapidly growing. In this review we provide an overview of the state-of-the-art of textiles, which use FOSs for monitoring of mechanical parameters of physiological interest. In particular we briefly describe the working principle of FOSs employed in this field and their relevant advantages and disadvantages. Also reviewed are their applications for the monitoring of mechanical parameters of physiological interest.

  8. Advances in fibers and transmission line technology for long haul submarine systems

    Science.gov (United States)

    Peckham, David W.; Kim, Jinkee; Sun, Yi; Lingle, Robert L., Jr.; Levring, Ole

    2007-11-01

    The 7.1-magnitude earthquake on December 26, 2006 in the Strait of Luzon resulted in the failure of several submarine cable systems. Seven of the nine cables that pass through the strait were damaged, disrupting communications to China, Taiwan, Japan, Korea and Singapore. This recent event highlighted the dependence of international communications on submarine fiber optic transmission systems. This paper will review the evolution of optical fiber transmission line technology that has been deployed in the long haul undersea telecommunications network. It will start with a discussion of the chronological evolution of the optical fiber transmission line architecture in section one, then give more detail regarding the technology that is still being deployed today.

  9. REDUCING FIBER LOSS IN LABORATORY-AND MILL-SCALE FLOTATION DEINKING USING SURFACTANT SPRAY TECHNOLOGY

    Institute of Scientific and Technical Information of China (English)

    Greg.DeLozier; YulinZhao; YulinDeng; DavidWhite; JunyongZhu; MarkPrein

    2004-01-01

    As the cost of quality waste paper continues to escalate in response tofor the finite resource,an increased global demand loss of saleable fiber within flotation rejects becomes both environmentally and economically unacceptable. The ability of surfactant spray technology to reduce yield loss without detriment to pulp brightness gains has been demonstrated during both laboratory-and pilot-scale flotation deinking investigations. This paper documents the successful transfer of this technology to a single flotation unit within the deinking line of a mill producing newsprint from 100% secondary fiber. Initial results suggest that the loss of fiber across the unit may be reduced by more than 50% without obvious detriment to final pulp quality.

  10. REDUCING FIBER LOSS IN LABORATORY- AND MILL-SCALE FLOTATION DEINKING USING SURFACTANT SPRAY TECHNOLOGY

    Institute of Scientific and Technical Information of China (English)

    Greg. DeLozier; Yulin Zhao; Yulin Deng; David White; Junyong Zhu; Mark Prein

    2004-01-01

    As the cost of quality waste paper continues to escalate in response to an increased global demand for the finite resource, loss of saleable fiber within flotation rejects becomes both environmentally and economically unacceptable. The ability of surfactant spray technology to reduce yield loss without detriment to pulp brightness gains has been demonstrated during both laboratory- and pilot-scale flotation deinking investigations. This paper documents the successful transfer of this technology to a single flotation unit within the deinking line of a mill producing newsprint from 100% secondary fiber. Initial results suggest that the loss of fiber across the unit may be reduced by more than 50%without obvious detriment to final pulp quality.

  11. Optical Fiber Sensor Technologies for Efficient and Economical Oil Recovery

    Energy Technology Data Exchange (ETDEWEB)

    Wang, a.; Pickrell, G.; Xiao, H.; May, r.

    2003-02-27

    The overall goal of this project was to develop reliable cost effective sensors for application in the down-hole environment. The physical parameters measured by these sensors were temperature, pressure, flow and acoustic signals. Sensor head configurations for each of the physical measurands were optimized to increase the sensitivity to the particular measurand of interest while decreasing the cross-sensitivity to the other physical measurands and to environmental influences. In addition, the optical signal demodulation electronics was designed to be insensitive to environmental influences while maintaining the required resolution, precision and accuracy of the parameter being sensed. The influence of potentially detrimental agents such as water in the down-hole environment was investigated as well as methods to protect both the optical fiber and the sensor from these detrimental effects.

  12. Advanced Fiber Optic-Based Sensing Technology for Unmanned Aircraft Systems

    Science.gov (United States)

    Richards, Lance; Parker, Allen R.; Piazza, Anthony; Ko, William L.; Chan, Patrick; Bakalyar, John

    2011-01-01

    This presentation provides an overview of fiber optic sensing technology development activities performed at NASA Dryden in support of Unmanned Aircraft Systems. Examples of current and previous work are presented in the following categories: algorithm development, system development, instrumentation installation, ground R&D, and flight testing. Examples of current research and development activities are provided.

  13. Ecologically clean and raw-resources-saving technology using photonic purification of fibers

    Science.gov (United States)

    Belyshev, Boris E.; Protasova, Valentina A.; Shepelev, Andrey V.; Kalinin, Yuri A.

    1995-04-01

    The elaborated technology of laseral optical pumping is successfully used for the purification of fibers from impurities. This is the novel and effective application of pulsed power. The higher powerful and technological advantages for purification of wool from vegetable impurities are presented in this paper. The aim of using light irradiation is almost complete cleaning of light wool from dark vegetable admixtures, dust and brand at the early steps (carding worsted blends) of technological process of producing fine yarns. Stabilizing all mechanical and chemical-technological processes following light radiation purification and increasing technical-economic parameters of production is achieved in this case as well. The physical essence of light irradiation wool cleaning is based upon different optical and thermal properties of light fibers on the one hand, and of dark admixtures-fractions of vegetable matter and burrs, dust and brand-on the other hand. The difference of coefficients of light irradiation by fibers and impurities is of great importance. The 500-1100 nm spectral range has a selective impact on the fibers and impurities.

  14. Next Generation Large Mode Area Fiber Technologies for High Power Fiber Laser Arrays

    Science.gov (United States)

    2012-06-08

    Derivation of General Quasi‐Phase‐Matching (QPM) Conditions .....  68   References for Appendix A...Snyder, “Light Propagation in Twisted Anisotropic Media: Application to  Photoreceptors”, J. Opt. Soc. Am., vol.  68 , No. 2, 149 – 157 (1978)  [8...tunneling,” IEEE Trans. Microwave Theory Tech. MTT‐23, 134‐141 (1975).  [12] D.  Marcuse , “Curvature loss formula for optical fibers,” J. Opt. Soc. Am

  15. An Optical Fiber Viscometer Based on Long-Period Fiber Grating Technology and Capillary Tube Mechanism

    Directory of Open Access Journals (Sweden)

    Jian-Neng Wang

    2010-12-01

    Full Text Available This work addresses the development and assessment of a fiber optical viscometer using a simple and low-cost long-period fiber grating (LPFG level sensor and a capillary tube mechanism. Previous studies of optical viscosity sensors were conducted by using different optical sensing methods. The proposed optical viscometer consists of an LPFG sensor, a temperature-controlled chamber, and a cone-shaped reservoir where gravitational force could cause fluid to flow through the capillary tube. We focused on the use of LPFGs as level sensors and the wavelength shifts were not used to quantify the viscosity values of asphalt binders. When the LPFG sensor was immersed in the constant volume (100 mL AC-20 asphalt binder, a wavelength shift was observed and acquired using LabVIEW software and GPIB controller. The time spent between empty and 100 mL was calculated to determine the discharge time. We simultaneously measured the LPFG-induced discharge time and the transmission spectra both in hot air and AC-20 asphalt binder at five different temperatures, 60, 80, 100, 135, and 170 Celsius. An electromechanical rotational viscometer was also used to measure the viscosities, 0.15–213.80 Pa·s, of the same asphalt binder at the above five temperatures. A non-linear regression analysis was performed to convert LPFG-induced discharge time into viscosities. Comparative analysis shows that the LPFG-induced discharge time agreed well with the viscosities obtained from the rotational viscometer.

  16. Assessment of fiber optic sensors and other advanced sensing technologies for nuclear power plants

    Energy Technology Data Exchange (ETDEWEB)

    Hashemian, H.M. [Analysis and Measurement Services Corporation, Knoxville, TN (United States)

    1996-03-01

    As a result of problems such as calibration drift in nuclear plant pressure sensors and the recent oil loss syndrome in some models of Rosemount pressure transmitters, the nuclear industry has become interested in fiber optic pressure sensors. Fiber optic sensing technologies have been considered for the development of advanced instrumentation and control (I&C) systems for the next generation of reactors and in older plants which are retrofitted with new I&C systems. This paper presents the results of a six-month Phase I study to establish the state-of-the-art in fiber optic pressure sensing. This study involved a literature review, contact with experts in the field, an industrial survey, a site visit to a fiber optic sensor manufacturer, and laboratory testing of a fiber optic pressure sensor. The laboratory work involved both static and dynamic performance tests. This initial Phase I study has recently been granted a two-year extension by the U.S. Nuclear Regulatory Commission (NRC). The next phase will evaluate fiber optic pressure sensors in specific nuclear plant applications in addition to other advanced methods for monitoring critical nuclear plant equipment.

  17. Lab-on-fiber technology: a new vision for chemical and biological sensing.

    Science.gov (United States)

    Ricciardi, Armando; Crescitelli, Alessio; Vaiano, Patrizio; Quero, Giuseppe; Consales, Marco; Pisco, Marco; Esposito, Emanuela; Cusano, Andrea

    2015-12-21

    The integration of microfluidics and photonic biosensors has allowed achievement of several laboratory functions in a single chip, leading to the development of photonic lab-on-a-chip technology. Although a lot of progress has been made to implement such sensors in small and easy-to-use systems, many applications such as point-of-care diagnostics and in vivo biosensing still require a sensor probe able to perform measurements at precise locations that are often hard to reach. The intrinsic property of optical fibers to conduct light to a remote location makes them an ideal platform to meet this demand. The motivation to combine the good performance of photonic biosensors on chips with the unique advantages of optical fibers has thus led to the development of the so-called lab-on-fiber technology. This emerging technology envisages the integration of functionalized materials on micro- and nano-scales (i.e. the labs) with optical fibers to realize miniaturized and advanced all-in-fiber probes, especially useful for (but not limited to) label-free chemical and biological applications. This review presents a broad overview of lab-on-fiber biosensors, with particular reference to lab-on-tip platforms, where the labs are integrated on the optical fiber facet. Light-matter interaction on the fiber tip is achieved through the integration of thin layers of nanoparticles or nanostructures supporting resonant modes, both plasmonic and photonic, highly sensitive to local modifications of the surrounding environment. According to the physical principle that is exploited, different configurations - such as localized plasmon resonance probes, surface enhanced Raman scattering probes and photonic probes - are classified, while various applications are presented in context throughout. For each device, the surface chemistry and the related functionalization protocols are reviewed. Moreover, the implementation strategies and fabrication processes, either based on bottom-up or top

  18. A Review on Radio-Over-Fiber Technology-Based Integrated (Optical/Wireless) Networks

    Science.gov (United States)

    Rajpal, Shivika; Goyal, Rakesh

    2017-03-01

    In the present paper, radio-over-fiber (RoF) technology has been proposed, which is the integration of the optical and radio networks. With a high transmission capacity, comparatively low cost and low attenuation, optical fiber provides an ideal solution for accomplishing the interconnections. In addition, a radio system enables the significant mobility, flexibility and easy access. Therefore, the system integration can meet the increasing demands of subscribers for voice, data and multimedia services that require the access network to support high data rates at any time and any place inexpensively. RoF has the potentiality to the backbone of the wireless access network and it has gained significant momentum in the last decade as a potential last-mile access scheme. This paper gives the comprehensive review of RoF technology used in the communication system. Concept, applications, advantages and limitations of RoF technology are also discussed in this paper.

  19. Transport Schemes for Fiber-Wireless Technology: Transmission Performance and Energy Efficiency

    Directory of Open Access Journals (Sweden)

    Christina Lim

    2014-04-01

    Full Text Available Fiber-wireless technology has been actively researched as a potential candidate for next generation broadband wireless signal distribution. Despite the popularity, this hybrid scheme has many technical challenges that impede the uptake and commercial deployment. One of the inherent issues is the transport of the wireless signals over a predominantly digital optical network in today’s telecommunication infrastructure. Many different approaches have been introduced and demonstrated with digitized RF transport of the wireless signals being the most compatible with the existing optical fiber networks. In this paper, we review our work in the area of digitized RF transport to address the inherent issues related to analog transport in the fiber-wireless links and compare the transmission performance and energy efficiency with the other transport strategies.

  20. Steel fiber reinforced concrete pipes: part 1: technological analysis of the mechanical behavior

    Directory of Open Access Journals (Sweden)

    A. D. de Figueiredo

    Full Text Available This paper is the first part of an extensive work focusing the technological development of steel fiber reinforced concrete pipes (FRCP. Here is presented and discussed the experimental campaign focusing the test procedure and the mechanical behavior obtained for each of the dosages of fiber used. In the second part ("Steel fiber reinforced concrete pipes. Part 2: Numerical model to simulate the crushing test", the aspects of FRCP numerical modeling are presented and analyzed using the same experimental results in order to be validated. This study was carried out trying to reduce some uncertainties related to FRCP performance and provide a better condition to the use of these components. In this respect, an experimental study was carried out using sewage concrete pipes in full scale as specimens. The diameter of the specimens was 600 mm, and they had a length of 2500 mm. The pipes were reinforced with traditional bars and different contents of steel fibers in order to compare their performance through the crushing test. Two test procedures were used in that sense. In the 1st Series, the diameter displacement was monitored by the use of two LVDTs positioned at both extremities of the pipes. In the 2nd Series, just one LVDT is positioned at the spigot. The results shown a more rigidity response of the pipe during tests when the displacements were measured at the enlarged section of the socket. The fiber reinforcement was very effective, especially when low level of displacement was imposed to the FRCP. At this condition, the steel fibers showed an equivalent performance to superior class pipes made with traditional reinforced. The fiber content of 40 kg/m3 provided a hardening behavior for the FRCP, and could be considered as equivalent to the critical volume in this condition.

  1. Ceramic fiber technology frontier Quest%陶瓷纤维技术前沿探秘

    Institute of Scientific and Technical Information of China (English)

    刘道春

    2012-01-01

    Ceramic fiber is a set of traditional insulation materials,refractory fibrous excellent performance in one lightweight refractories,ceramic fiber,light weight,high temperature,thermal stability,low thermal conductivity,heat resistance of small and advantages such as mechanical vibrations,which involves all areas of its products,development prospects.This paper describes the types and properties of ceramic fiber characteristics,the nature and structure of ceramic fiber manufacturing methods;ceramic fiber main purpose and scope of application;and ceramic fiber kiln in the application of thermal technology;also pointed out that the development of the ceramic fiber trend%陶瓷纤维是一种集传统绝热材料、耐火材料优良性能于一体的纤维状轻质耐火材料,陶瓷纤维具有重量轻、耐高温、热稳定性好、导热率低、比热小及耐机械震动等优点,因而其产品涉及各领域,发展前景十分看好。本文分别介绍了陶瓷纤维的种类及性能特点,陶瓷纤维的结构性质和制造方法;陶瓷纤维的主要用途和应用范围;以及陶瓷纤维在热工窑炉中的应用技术;同时指出了陶瓷纤维的发展趋势。

  2. New technology developments make passive laser/fiber alignment a reality

    Science.gov (United States)

    Collins, John V.; MacDonald, Brian M.; Lealman, I. F.; Jones, C. A.

    1996-01-01

    In this paper we report on the combination of a precision cleaved large spot laser and a silicon micromachined optical bench to achieve high coupling efficiencies by purely passive alignment. Coupling efficiencies of over 50% have been obtained by passively aligning precision cleaved large spot sized lasers to singlemode fiber on a silicon micromachined substrate. This is the highest known coupling figure reported for passive alignment. The packaging of semiconductor laser chips has always presented a range of technical problems due to the sub-micron tolerances required to obtain optimum coupling of the small laser spot size to the larger spot size of a singlemode fiber. Lasers have been developed that can ease these tolerances by matching the laser spot size to that of cleaved fiber. This is achieved by tapering the active layer to adiabatically expand the laser mode size. A method of controlling the physical size of laser diode chips to sub-micron accuracy has enabled these lasers to be bonded against substantial alignment features on a silicon micro-engineered optical bench which also includes a V-groove into which a cleaved single-mode optical fiber can be fixed. Results are also discussed for an alternative ferrule-based, non-hermetic laser packaging design which utilizes the relaxed alignment tolerances of the large spot lasers to give simple package assembly suitable for automation. Both of the packaging technologies discussed offer a viable route to obtaining the very low cost optoelectronic components required for fiber to the home networks.

  3. Impact Goals of Research and Development Technology on the Business Strategy of NTT's Fiber-to-the-Home Deployment

    Science.gov (United States)

    Kimura, Hideaki

    2013-03-01

    Huge investment is needed for introducing a fiber-to-the-home system, so research and development strategy is very important. Requirements for fiber-to-the-home systems have been increased because communication systems have been recognized as one of the lifelines along with water, electricity, and gas. Furthermore, low energy consumption and recyclable eco-friendliness are required for products. NTT has been challenged to reduce capital expenditure, reduce operational expenditure, and create new applications for expanding the number of fiber-to-the-home subscribers from the viewpoint of a technological approach, including access infrastructure, fiber, transmission, and wireless technologies. Due to continuous and strategic technological development, the number of NTT's fiber-to-the-home subscribers is now over 17 million.

  4. 纳滤技术在油田调驱配聚中的应用进展%Application Progress of Nanofiltration Membrance Technique in Profile Control and Preparing Polymer for Oil Fields

    Institute of Scientific and Technical Information of China (English)

    罗跃; 赵素娟; 刘清云; 李思

    2011-01-01

    Nanofilitration as a new separation technique possess has high retention for divalent ions,which can separate most divalent ions such as Ca2+,Mg2+,Ba2+、 CO32-,SO42-and so on ,the oil field water treated by nanofiltration membrance technique for preparing polymer can reduce the impact of high valence ions on the polymer gel. In this paper, the separation principle of the nanofiltration membrance technique and properties of oil field produced water were introduced, and the feasibility and research status of the nanofiltration membrance technique to treat oil water for preparing polymers were discussed.%纳滤(Nanofilitration,NF)是一种新型分离技术,对二价离子具有高截留的特性,可分离大部分油田水中的二价离子,如Ca2+、Mg2+、Ba2+、CO32-、SO42-等成垢离子.用纳滤技术处理后的注入水配聚,可减少高价离子对聚合物凝胶的影响.介绍了纳滤处理油田采出水的原理,油田采出水特性,以及纳滤软化注入水配制聚合物的的可行性及研究现状.

  5. Research on the surface subsidence monitoring technology based on fiber Bragg grating sensing

    Science.gov (United States)

    Wang, Jinyu; Jiang, Long; Sun, Zengrong; Hu, Binxin; Zhang, Faxiang; Song, Guangdong; Liu, Tongyu; Qi, Junfeng; Zhang, Longping

    2017-03-01

    In order to monitor the process of surface subsidence caused by mining in real time, we reported two types of fiber Bragg grating (FBG) based sensors. The principles of the FBG-based displacement sensor and the FBG-based micro-seismic sensor were described. The surface subsidence monitoring system based on the FBG sensing technology was designed. Some factual application of using these FBG-based sensors for subsidence monitoring in iron mines was presented.

  6. Technology of fiber-optic temperature sensing and its application in temperature measuring of gob area

    Institute of Scientific and Technical Information of China (English)

    LIU Jing-wen; HUANG Li-ming

    2011-01-01

    Based on advantages of technology of distributive fiber-optic temperature sensing and specific to its applications in monitoring mine conflagration, the corresponding Processes such as connection arrangement, signal transmission and monitoring were illustrated. As applied in Sitai Coal Mine of Datong Coal Mine Group Co., this method is effective and accurate and could provide reliable gist for monitoring spontaneous combustion in gob area of mines.

  7. Papermaking fibers from giant reed (Arundo donax L.) by advanced ecologically friendly pulping and bleaching technologies

    OpenAIRE

    2006-01-01

    The anatomical structure and chemical composition of the stem-wall material of giant reed is considered from the viewpoint of raw material characterization for industrial fiber production. The effect of stem morphology (nodes and internodes) on pulping results and general pulp properties is discussed. The advantages of application of modern organic solvent based (organosolv) pulping technologies to giant reed are shown in comparison with the conventional (kraft) method. The conditions optimiz...

  8. Transport Schemes for Fiber-Wireless Technology: Transmission Performance and Energy Efficiency

    OpenAIRE

    Christina Lim; Yizhuo Yang; Ampalavanapillai Nirmalathas

    2014-01-01

    Fiber-wireless technology has been actively researched as a potential candidate for next generation broadband wireless signal distribution. Despite the popularity, this hybrid scheme has many technical challenges that impede the uptake and commercial deployment. One of the inherent issues is the transport of the wireless signals over a predominantly digital optical network in today’s telecommunication infrastructure. Many different approaches have been introduced and demonstrated with digitiz...

  9. Fiber optic vibration sensor for high-power electric machines realized using 3D printing technology

    Science.gov (United States)

    Igrec, Bojan; Bosiljevac, Marko; Sipus, Zvonimir; Babic, Dubravko; Rudan, Smiljko

    2016-03-01

    The objective of this work was to demonstrate a lightweight and inexpensive fiber-optic vibration sensor, built using 3D printing technology, for high-power electric machines and similar applications. The working principle is based on modulating the light intensity using a blade attached to a bendable membrane. The sensor prototype was manufactured using PolyJet Matrix technology with DM 8515 Grey 35 Polymer. The sensor shows linear response, expected bandwidth (< 150 Hz), and from our measurements we estimated the damping ratio for used polymer to be ζ ≍ 0.019. The developed prototype is simple to assemble, adjust, calibrate and repair.

  10. Coverage Range and Cost Comparison of Remote Antenna Unit Designs for Inbuilding Radio over Fiber Technology

    Directory of Open Access Journals (Sweden)

    Razali Ngah

    2013-09-01

    Full Text Available Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fiber (RoF technology is one of the most important enabler in access network for the technologies. Adoption of RoF faces bottleneck in optoelectronics, that they are still expensive, high power consumption, and limited in bandwidth. To solve the problem, transceiver in remote antenna unit (RAU is developed, i.e. electroabsorption transceiver (EAT and asymmetric FabryPerot modulator (AFPM. This paper compares their coverage range and cost in providing WCDMA and WLAN services. Needed gain of RF amplifier for supporting picocell is also discussed.

  11. High heralding-efficiency of near-IR fiber coupled photon pairs for quantum technologies

    Energy Technology Data Exchange (ETDEWEB)

    Dixon, P. Ben [Massachusetts Institute of Technology (MIT); Murphy, Ryan [Lincoln Laboratory, Massachusetts Institute of Technology (MIT); Rosenberg, Danna [Massachusetts Institute of Technology (MIT); Grein, Matthew E. [Massachusetts Institute of Technology (MIT); Stelmakh, Veronika [Massachusetts Institute of Technology (MIT); Bennink, Ryan S [ORNL; Wong, Franco N. C. [Massachusetts Institute of Technology (MIT)

    2015-01-01

    We report on the development and use of a high heralding-efficiency, single-mode-fiber coupled telecom-band source of entangled photons for quantum technology applications. The source development efforts consisted of theoretical and experimental efforts and we demonstrated a correlated-mode coupling efficiency of 97% 2%, the highest efficiency yet achieved for this type of system. We then incorporated these beneficial source development techniques in a Sagnac configured telecom-band entangled photon source that generates photon pairs entangled in both time/energy and polarization degrees of freedom. We made use of these highly desirable entangled states to investigate several promising quantum technologies.

  12. Surface Acoustic Wave (SAW) Technology For Clock Recovery In The Fiber Distributed Data Interface (FDDI)

    Science.gov (United States)

    Slawson, Michael R.

    1987-01-01

    This paper describes the use of Surface Acoustic Wave (SAW) technology for clock recovery, and the performance of this technology in the Fiber Distributed Data Interface (FDDI) draft standard. FDDI, because it operates at 125 MBd over the fiber optic media, requires tight control of the jitter accumulated in each point-to-point fiber link. The clock recovery function must be able to recover the clock and correctly sample the bit stream, given a relatively narrow "eye opening" at its input. Furthermore, the clock must be maintained during the FDDI "line states," which can have a very low transition density. This paper will first describe the particular implementation of SAW technology used for clock recovery, the SAW filter, and will define it purpose within the clock recovery function. Then, the jitter characteristics of the FDDI signal at the input to clock recovery, as well as the performance of the SAW-based clock recovery function under these input conditions, will be discussed. Experimental results obtained using a typical, Commercially available, SAW filter-based module will be presented. The various "detuning" sources of the SAW filter, which detract from the capability of the SAW-based module to perform accurate sampling, will be discussed. The performance of the module under FDDI line state conditions, particularly Master Line State (MLS) and Quit Line State (QLS), will be analyzed. The QLS, which indicated a disabled upstream transmitter or a cable break, contains no transitions and therefore no information for clock recovery. A circuit will be presented which uses the station's local oscillator and the "signal detect" function of the fiber optic receiver to derive the recovered clock in the event of QLS.

  13. Fabrication of fiber-optic broadband ultrasound emitters by micro-opto-mechanical technology

    Science.gov (United States)

    Belsito, L.; Vannacci, E.; Mancarella, F.; Ferri, M.; Veronese, G. P.; Biagi, E.; Roncaglia, A.

    2014-08-01

    A micro-opto-mechanical system (MOMS) technology for the fabrication of fiber-optic optoacoustic emitters is presented. The described devices are based on the thermoelastic generation of ultrasonic waves from patterned carbon films obtained by the controlled pyrolysis of photoresist layers and fabricated on miniaturized single-crystal silicon frames used to mount the emitters on the tip of an optical fiber. Thanks to the micromachining process adopted, high miniaturization levels are reached in the fabrication of the emitters, and self-standing devices on optical fiber with diameter around 350 µm are demonstrated, potentially suited to minimally invasive medical applications. The functional testing of fiber-optic emitter prototypes in water performed by using a 1064 nm Q-switched Nd-YAG excitation laser source is also presented, yielding broadband emission spectra extended from low frequencies up to more than 40 MHz, and focused emission fields with a maximum peak-to-peak pressure level of about 1.2 MPa at a distance of 1 mm from the devices.

  14. High Sensitivity Refractometer Based on TiO₂-Coated Adiabatic Tapered Optical Fiber via ALD Technology.

    Science.gov (United States)

    Zhu, Shan; Pang, Fufei; Huang, Sujuan; Zou, Fang; Guo, Qiang; Wen, Jianxiang; Wang, Tingyun

    2016-08-15

    Atomic layer deposition (ALD) technology is introduced to fabricate a high sensitivity refractometer based on an adiabatic tapered optical fiber. Different thicknesses of titanium dioxide (TiO₂) nanofilm were coated around the tapered fiber precisely and uniformly under different deposition cycles. Attributed to the higher refractive index of the TiO₂ nanofilm compared to that of silica, an asymmetric Fabry-Perot (F-P) resonator could be constructed along the fiber taper. The central wavelength of the F-P resonator could be controlled by adjusting the thickness of the TiO₂ nanofilm. Such a F-P resonator is sensitive to changes in the surrounding refractive index (SRI), which is utilized to realize a high sensitivity refractometer. The refractometer developed by depositing 50.9-nm-thickness TiO₂ on the tapered fiber shows SRI sensitivity as high as 7096 nm/RIU in the SRI range of 1.3373-1.3500. Due to TiO₂'s advantages of high refractive index, lack of toxicity, and good biocompatibility, this refractometer is expected to have wide applications in the biochemical sensing field.

  15. Smooth muscle-like tissue constructs with circumferentially oriented cells formed by the cell fiber technology.

    Directory of Open Access Journals (Sweden)

    Amy Y Hsiao

    Full Text Available The proper functioning of many organs and tissues containing smooth muscles greatly depends on the intricate organization of the smooth muscle cells oriented in appropriate directions. Consequently controlling the cellular orientation in three-dimensional (3D cellular constructs is an important issue in engineering tissues of smooth muscles. However, the ability to precisely control the cellular orientation at the microscale cannot be achieved by various commonly used 3D tissue engineering building blocks such as spheroids. This paper presents the formation of coiled spring-shaped 3D cellular constructs containing circumferentially oriented smooth muscle-like cells differentiated from dedifferentiated fat (DFAT cells. By using the cell fiber technology, DFAT cells suspended in a mixture of extracellular proteins possessing an optimized stiffness were encapsulated in the core region of alginate shell microfibers and uniformly aligned to the longitudinal direction. Upon differentiation induction to the smooth muscle lineage, DFAT cell fibers self-assembled to coiled spring structures where the cells became circumferentially oriented. By changing the initial core-shell microfiber diameter, we demonstrated that the spring pitch and diameter could be controlled. 21 days after differentiation induction, the cell fibers contained high percentages of ASMA-positive and calponin-positive cells. Our technology to create these smooth muscle-like spring constructs enabled precise control of cellular alignment and orientation in 3D. These constructs can further serve as tissue engineering building blocks for larger organs and cellular implants used in clinical treatments.

  16. Smooth muscle-like tissue constructs with circumferentially oriented cells formed by the cell fiber technology.

    Science.gov (United States)

    Hsiao, Amy Y; Okitsu, Teru; Onoe, Hiroaki; Kiyosawa, Mahiro; Teramae, Hiroki; Iwanaga, Shintaroh; Kazama, Tomohiko; Matsumoto, Taro; Takeuchi, Shoji

    2015-01-01

    The proper functioning of many organs and tissues containing smooth muscles greatly depends on the intricate organization of the smooth muscle cells oriented in appropriate directions. Consequently controlling the cellular orientation in three-dimensional (3D) cellular constructs is an important issue in engineering tissues of smooth muscles. However, the ability to precisely control the cellular orientation at the microscale cannot be achieved by various commonly used 3D tissue engineering building blocks such as spheroids. This paper presents the formation of coiled spring-shaped 3D cellular constructs containing circumferentially oriented smooth muscle-like cells differentiated from dedifferentiated fat (DFAT) cells. By using the cell fiber technology, DFAT cells suspended in a mixture of extracellular proteins possessing an optimized stiffness were encapsulated in the core region of alginate shell microfibers and uniformly aligned to the longitudinal direction. Upon differentiation induction to the smooth muscle lineage, DFAT cell fibers self-assembled to coiled spring structures where the cells became circumferentially oriented. By changing the initial core-shell microfiber diameter, we demonstrated that the spring pitch and diameter could be controlled. 21 days after differentiation induction, the cell fibers contained high percentages of ASMA-positive and calponin-positive cells. Our technology to create these smooth muscle-like spring constructs enabled precise control of cellular alignment and orientation in 3D. These constructs can further serve as tissue engineering building blocks for larger organs and cellular implants used in clinical treatments.

  17. Design of a Multicast Optical Packet Switch Based on Fiber Bragg Grating Technology for Future Networks

    Science.gov (United States)

    Cheng, Yuh-Jiuh; Yeh, Tzuoh-Chyau; Cheng, Shyr-Yuan

    2011-09-01

    In this paper, a non-blocking multicast optical packet switch based on fiber Bragg grating technology with optical output buffers is proposed. Only the header of optical packets is converted to electronic signals to control the fiber Bragg grating array of input ports and the packet payloads should be transparently destined to their output ports so that the proposed switch can reduce electronic interfaces as well as the bit rate. The modulation and the format of packet payloads may be non-standard where packet payloads could also include different wavelengths for increasing the volume of traffic. The advantage is obvious: the proposed switch could transport various types of traffic. An easily implemented architecture which can provide multicast services is also presented. An optical output buffer is designed to queue the packets if more than one incoming packet should reach to the same destination output port or including any waiting packets in optical output buffer that will be sent to the output port at a time slot. For preserving service-packet sequencing and fairness of routing sequence, a priority scheme and a round-robin algorithm are adopted at the optical output buffer. The fiber Bragg grating arrays for both input ports and output ports are designed for routing incoming packets using optical code division multiple access technology.

  18. Refractive index sensitivity enhancement of optical fiber cladding mode by depositing nanofilm via ALD technology.

    Science.gov (United States)

    Zhao, Ying; Pang, Fufei; Dong, Yanhua; Wen, Jianxiang; Chen, Zhenyi; Wang, Tingyun

    2013-11-04

    The atomic layer deposition (ALD) technology is introduced to enhance the sensitivity of optical fiber cladding mode to surrounding refractive index (SRI) variation. The highly uniform Al2O nanofilm was deposited around the double cladding fiber (DCF) which presents cladding mode resonant feature. With the high refractive index coating, the cladding mode resonant spectrum was tuned. And the sensitivity enhancement for SRI sensor was demonstrated. Through adjusting the deposition cycles, a maximum sensitivity of 723 nm/RIU was demonstrated in the DCF with 2500 deposition cycles at the SRI of 1.34. Based on the analysis of cladding modes reorganization, the cladding modes transition of the coated DCF was investigated theoretically. With the high performance nanofilm coating, the proposed SRI sensor is expected to have wide applications in chemical sensors and biosensors.

  19. 浅论光纤通信技术%Optical Fiber Communication Technology Study

    Institute of Scientific and Technical Information of China (English)

    封晓燕

    2011-01-01

    Optical fiber communication in China has nearly 30 years history of use,this history is the history of the development of optical communication technology and the development of optical fiber and cable history.Loss of optical fiber communication because of its low transmission frequency bandwidth, large capacity, small size,light weight,anti-electromagnetic interference,crosstalk is not easy, abundant resources,etc.,and much favored by the industry developed rapidly.Currently, fiber optic cable has been wired into all areas of communications,including telecommunications,radio communication,power communication,oil and communications,and military communications.In this paper, Analysis of the Optical Fiber Communication Research and Development.%光纤通信在我国已有近30年的使用历史,这段历史也就是光通信技术的发展史和光纤光缆的发展史。光纤通信因其具有的损耗低、传输频带宽、容量大、体积小、重量轻、抗电磁干扰、不易串音、资源丰富等优点,而备受业内人士青睐,发展非常迅速。目前,光纤光缆已经进入了有线通信的各个领域,包括邮电通信、广播通信、电力通信、石油通信和军用通信等领域。本文主要浅析我国光纤通信研究现状及其发展。

  20. Developing a new technology in the construction of fiber lenslet IFUs

    Science.gov (United States)

    de Oliveira, Antonio Cesar; Fraga, Luciano; de Oliveira, Ligia Souza; Castilho, Bruno; Gneiding, Clemens; Verducci Junior, Orlando

    2014-07-01

    In this paper we describe the recent advances in the development of new technologies applied in the construction of Integral Field Units (IFUs) at Laboratório Nacional de Astrofísica (LNA). Our prototype is the Eucalyptus lenslet IFU constructed for the 1.6m telescope at Pico dos Dias Observatory (OPD), Brazil. This first concept was the basis to build two other IFUs with significantly improved concepts: the SOAR Integral Field Unit Spectrograph (SIFS) and FRODOSPEC. All the new technologies used in the construction of these IFUs are described in detail in this paper and can be replicated in similar instruments with optical fibers, with considerable advantages over the traditional technologies.

  1. 伯氏疏螺旋体膜蛋白BmpA研究进展%Progresses on Borrelia burgdorferi Membrance Protein A (BmpA)

    Institute of Scientific and Technical Information of China (English)

    宝福凯; 赖名耀; 张云波; 董坚; 赵桂萍; 陈明清; 柳爱华

    2012-01-01

    Lyme disease, a global health concern, is a zoonosis, which has been a serious threat to human. The spiroehete Borrelia burgdorferi that is transmitted by the bite of hard tick (Ixodidae) is the pathogen of Lyme disease. Borrelia burgdorferi contains many membrane proteins with immungenicity and pathogenicity. Recent researches show that BmpA is an dominant immune protein of Borrelia burgdorferi, a laminin-binding protein, and an arthritogennic factor. Research progresses of BmpA protein in biological function, Lyme arthritis pathogenesis and diagnosis of lyme disease are reviewed.%莱姆病是一种人兽共患病,已严重威胁人类健康,成全球公共卫生问题,引起全球关注.伯氏疏螺旋体是莱姆病病原体,通过蜱叮咬传播而引起莱姆病,其表面存在的膜蛋白具有免疫性和致病性.BmpA (Borreli burgdorferi membrance protein A)是伯氏疏螺旋体的主要抗原之一,为层粘连蛋白结合蛋白,是莱姆关节炎的重要致病因子,对蛋白功能、诊断应用和莱姆关节炎致病机理三方面的研究进展进行概述.

  2. Zigbee networking technology and its application in Lamost optical fiber positioning and control system

    Science.gov (United States)

    Jin, Yi; Zhai, Chao; Gu, Yonggang; Zhou, Zengxiang; Gai, Xiaofeng

    2010-07-01

    4,000 fiber positioning units need to be positioned precisely in LAMOST(Large Sky Area Multi-object Optical Spectroscopic Telescope) optical fiber positioning & control system, and every fiber positioning unit needs two stepper motors for its driven, so 8,000 stepper motors need to be controlled in the entire system. Wireless communication mode is adopted to save the installing space on the back of the focal panel, and can save more than 95% external wires compared to the traditional cable control mode. This paper studies how to use the ZigBee technology to group these 8000 nodes, explores the pros and cons of star network and tree network in order to search the stars quickly and efficiently. ZigBee technology is a short distance, low-complexity, low power, low data rate, low-cost two-way wireless communication technology based on the IEEE 802.15.4 protocol. It based on standard Open Systems Interconnection (OSI): The 802.15.4 standard specifies the lower protocol layers-the physical layer (PHY), and the media access control (MAC). ZigBee Alliance defined on this basis, the rest layers such as the network layer and application layer, and is responsible for high-level applications, testing and marketing. The network layer used here, based on ad hoc network protocols, includes the following functions: construction and maintenance of the topological structure, nomenclature and associated businesses which involves addressing, routing and security and a self-organizing-self-maintenance functions which will minimize consumer spending and maintenance costs. In this paper, freescale's 802.15.4 protocol was used to configure the network layer. A star network and a tree network topology is realized, which can build network, maintenance network and create a routing function automatically. A concise tree network address allocate algorithm is present to assign the network ID automatically.

  3. Overview of Fiber Optic Sensor Technologies for Strain/Temperature Sensing Applications in Composite Materials

    Directory of Open Access Journals (Sweden)

    Manjusha Ramakrishnan

    2016-01-01

    Full Text Available This paper provides an overview of the different types of fiber optic sensors (FOS that can be used with composite materials and also their compatibility with and suitability for embedding inside a composite material. An overview of the different types of FOS used for strain/temperature sensing in composite materials is presented. Recent trends, and future challenges for FOS technology for condition monitoring in smart composite materials are also discussed. This comprehensive review provides essential information for the smart materials industry in selecting of appropriate types of FOS in accordance with end-user requirements.

  4. Overview of Fiber Optic Sensor Technologies for Strain/Temperature Sensing Applications in Composite Materials.

    Science.gov (United States)

    Ramakrishnan, Manjusha; Rajan, Ginu; Semenova, Yuliya; Farrell, Gerald

    2016-01-15

    This paper provides an overview of the different types of fiber optic sensors (FOS) that can be used with composite materials and also their compatibility with and suitability for embedding inside a composite material. An overview of the different types of FOS used for strain/temperature sensing in composite materials is presented. Recent trends, and future challenges for FOS technology for condition monitoring in smart composite materials are also discussed. This comprehensive review provides essential information for the smart materials industry in selecting of appropriate types of FOS in accordance with end-user requirements.

  5. Application of Distributed Optical Fiber Sensing Technology in the Anomaly Detection of Shaft Lining in Grouting

    Directory of Open Access Journals (Sweden)

    Chunde Piao

    2015-01-01

    Full Text Available The rupture of the shaft lining caused by grouting has seriously undermined the safety in coal mining. Based on BOTDR distributed optical fiber sensing technology, this paper studied the layout method of optical fiber sensors and the anomaly detection method of the deformation and obtained the evolution law of shaft deformation triggered by grouting. The research results showed that the bonding problem of optical fiber sensors in damp environment could be effectively solved, by applying the binder consisting of sodium silicate and cement. Through BOTDR-based deformation detection, the real-time deformation of the shaft lining caused by grouting was immediately spotted. By comparing the respective strain of shaft lining deformation and concrete deformation, the risk range of shaft lining grouting was identified. With the additional strain increment of the shaft lining triggered by each process of grouting, the saturated condition of grouting volume in strata was analyzed, providing an important technical insight into the field construction and the safety of the shaft lining.

  6. Effect of four types of dietary fiber on the technological quality of pasta.

    Science.gov (United States)

    Bustos, M C; Pérez, G T; León, A E

    2011-06-01

    The development of dietary fiber-enriched foods permits to obtain products with functional properties but can cause several problems in technological quality. The aim of this study was to study the quality of pasta obtained by replacing bread wheat flour with resistant starch II (RSII), resistant starch IV (RSIV), oat bran (OB) and inulin (IN) with the purpose of improving their nutritional quality. RSII, RSIV, OB and IN were substituted for a portion of bread wheat flour at levels 2.5%, 5.0%, 7.5% and 10.0%. Cooking properties, amylose and inulin losses, color and texture were measured. Finally, nutritional quality of enriched pasta was evaluated by protein losses during cooking and total dietary fiber. Microstructure of pasta was analyzed by scanning electron microscopy. Addition of RSII into pasta formulation improved the quality of the final product. RSIV-enriched pasta presented an improvement in textural characteristics and OB affected cooking properties positively up to 5% of substitution. Inulin was lost during cooking; besides, its addition negatively affected the technological quality of pasta. The results obtained in this study prove that it is possible to elaborate pasta with acceptable cooking quality and with improved nutritional characteristics by adding 10% of RSII and RSIV and 5% of OB.

  7. An optical fiber Fabry-Perot flow measurement technology based on partial bend structure

    Science.gov (United States)

    Yang, Huijia; Jiang, Junfeng; Zhang, Xuezhi; Pan, Yuheng; Zhu, Wanshan; Zhou, Xiang; Liu, Tiegen

    2016-08-01

    An optical fiber Fabry-Perot (F-P) flow measurement technology is presented, which is based on partial bend structure. A 90° partial bend structure is designed to achieve the non-probe flow measurement with a pressure difference. The fluid simulation results of partial bend structure show that the error of the pressure difference is below 0.05 kPa during steady flow. The optical fiber F-P sensor mounted on the elbow with pressure test accuracy of 1% full scale is used to measure the fluid flow. Flow test results show that when the flow varies from 1 m3/h to 6.5 m3/h at ambient temperature of 25 °C, the response time is 1 s and the flow test accuracy is 4.5% of the F-P flow test system, proving that the F-P flow test method based on partial bend structure can be used in fluid flow measurement.

  8. Papermaking fibers from giant reed (Arundo donax L. by advanced ecologically friendly pulping and bleaching technologies

    Directory of Open Access Journals (Sweden)

    Pereira, H.

    2006-07-01

    Full Text Available The anatomical structure and chemical composition of the stem-wall material of giant reed is considered from the viewpoint of raw material characterization for industrial fiber production. The effect of stem morphology (nodes and internodes on pulping results and general pulp properties is discussed. The advantages of application of modern organic solvent based (organosolv pulping technologies to giant reed are shown in comparison with the conventional (kraft method. The conditions optimization for Ethanol-Alkali pulping (a selected organosolv pulping process is given, and the chemical kinetics of the principal macromolecular components during ethanol-alkali pulping is described. The bleachability of organosolv pulps by short totally chlorine free (TCF bleaching sequences using hydrogen peroxide and ozone as the active bleaching chemicals without pulp pre-delignification is examined and compared with kraft pulps. The enzymatic pre-treatment of reed organosolv pulps by commercial xylanase preparation is considered as a possibility toward the improvement of pulp bleachability.

  9. A novel biomimetic whisker technology based on fiber Bragg grating and its application

    Science.gov (United States)

    Zhao, Chenlu; Jiang, Qi; Li, Yibin

    2017-09-01

    The paper describes a novel, biomimetic whisker-based sensing technology following the basic design of the facial whiskers of animals such as rats and mice. The sensor consists of a 3× 2 whisker array on each side of a robot. In experiments with the artificial whiskers, the motor drives rotating whiskers, and the center wavelength of a fiber Bragg grating pasted on the whisker will shift when the whisker touches an obstacle. The distance will be obtained by processing the wavelength shift data with algorithms. Then the shape recognition can be realized by postprocessing the distance data. The experimental results prove that the whisker array is capable of accurately gathering the distance and shape information of an object.

  10. Research on the gear operating state detection based on the fiber Bragg grating sensing technology

    Science.gov (United States)

    Liu, Yijun; Zhang, Wenying; Jin, Zhouyi; Liu, Jiapei; Li, Mingyue; Li, Xin; Geng, Biao; Dong, Bo

    2017-09-01

    With the development of people’s production and the accelerated growth of industrial demand, industrial manufacturers continue to improve the level of real-time detection of gear requirements. In order to improve the safety of mechanical equipment and to reduce the gear failure of the economic losses, the real-time monitoring of gear running technology is of a positive meaning. Based on the existing research results of gear dynamic detection, this paper proposes a fiber-optic grating sense of the gear operating state detection system. Stress tests were performed by varying the different load torques. The experimental results show that at the load of 10Nm and the rotating speed of 70r/min, the dedendum stress reached 130.4MPa. Compared with the theoretical value, the test error was 6.66%.

  11. Nondestructive thickness measurement system for multiple layers of paint based on femtosecond fiber laser technologies

    Science.gov (United States)

    Sudo, Masaaki; Takayanagi, Jun; Ohtake, Hideyuki

    2016-11-01

    Because optical fiber-based optical systems are generally robust against external interference, they can be used as reliable systems in industrial applications in various fields. This paper describes fiber lasers generating femtosecond pulses that use optical fibers as gain media and optical paths. Additionally, the nondestructive paint multilayer thickness measurement of automotive parts using terahertz waves generated and detected by femtosecond fiber laser systems was conducted.

  12. Influence of Spinning Technology on Dye Uptake of Modified Polypropylene Fiber

    Institute of Scientific and Technical Information of China (English)

    张瑜; 朱美芳; 俞成丙; 陈彦模

    2001-01-01

    By adding small amount of olefin polymer additive, the dyeability of polypropylene fiber can be improved.Research results show that the improvement of dyeing performance of modified PP fiber is mainly due to the formation of looser structure of PP matrix and the microchannels among additive particles in blended fiber. The dye uptake of drawn fibers decreases with drawing ratios obviously and changes with temperature of heat plate and heat roller a little.

  13. Fiber-Based, Trace-Gas, Laser Transmitter Technology Development for Space

    Science.gov (United States)

    Stephen, Mark; Yu, Anthony; Chen, Jeffrey; Nicholson, Jeffrey; Engin, Doruk; Mathason, Brian; Wu, Stewart; Allan, Graham; Hasselbrack, William; Gonzalez, Brayler; Han, Lawrence; Numata, Kenji; Storm, Mark; Abshire, James

    2015-01-01

    NASA’s Goddard Space Flight Center (GSFC) is working on maturing the technology readiness of a laser transmitter designed for use in atmospheric CO2 remote-sensing. GSFC has been developing an airplane-based CO2 lidar instrument over several years to demonstrate the efficacy of the instrumentation and measurement technique and to link the science models to the instrument performance. The ultimate goal is to make space-based satellite measurements with global coverage. In order to accomplish this, we must demonstrate the technology readiness and performance of the components as well as demonstrate the required power-scaling to make the link with the required signal-to-noise-ratio (SNR). To date, all the instrument components have been shown to have the required performance with the exception of the laser transmitter.In this program we are working on a fiber-based master oscillator power amplifier (MOPA) laser transmitter architecture where we will develop a ruggedized package and perform the relevant environmental tests to demonstrate TRL-6. In this paper we will review our transmitter architecture and progress on the performance and packaging of the laser transmitter.

  14. Blind Source Separation Model of Earth-Rock Junctions in Dike Engineering Based on Distributed Optical Fiber Sensing Technology

    Directory of Open Access Journals (Sweden)

    Huaizhi Su

    2015-01-01

    Full Text Available Distributed temperature sensing (DTS provides an important technology support for the earth-rock junctions of dike projects (ERJD, which are binding sites between culvert, gates, and pipes and dike body and dike foundation. In this study, a blind source separation model is used for the identification of leakages based on the temperature data of DTS in leakage monitoring of ERJD. First, a denoising method is established based on the temperature monitoring data of distributed optical fiber in ERJD by a wavelet packet signal decomposition technique. The temperature monitoring messages of fibers are combined response for leakages and other factors. Its character of unclear responding mechanism is very obvious. Thus, a blind source separation technology is finally selected. Then, the rule of temperature measurement data for optical fiber is analyzed and its temporal and spatial change process is also discussed. The realization method of the blind source separation model is explored by combining independent component analysis (ICA with principal component analysis (PCA. The practical test result in an example shows that the method could efficiently locate and identify the leakage location of ERJD. This paper is expected to be useful for further scientific research and efficient applications of distributed optical fiber sensing technology.

  15. ECOAL Project—Delivering Solutions for Integrated Monitoring of Coal-Related Fires Supported on Optical Fiber Sensing Technology

    Directory of Open Access Journals (Sweden)

    Joana Ribeiro

    2017-09-01

    Full Text Available The combustion of coal wastes resulting from mining is of particular environmental concern, and the importance of proper management involving real-time assessment of their status and identification of probable evolution scenarios is recognized. Continuous monitoring of the combustion temperature and emission levels of certain gases allows for the possibility of planning corrective actions to minimize their negative impact on the surroundings. Optical fiber technology is well suited to this purpose and here we describe the main attributes and results obtained from a fiber optic sensing system projected to gather data on distributed temperature and gas emissions in these harsh environments.

  16. Development and application of fiber laser cutting technology%光纤激光切割技术

    Institute of Scientific and Technical Information of China (English)

    沈海平; 陈欣; 陈阳

    2013-01-01

    The laser cutting technology has been widely applied in cutting industry due to its perfect cutting quality,high dimension accuracy and small heat influence area.The advantages of fiber laser cutting machine in technology,structure and cost are analyzed by the description of fiber laser cutting and comparison with carbon dioxide laser cutting technology.In addition,relatively faster cutting speed,higher conversion rate from electricity to laser and flexible manufacturing ability promote fiber laser cuter to be advanced equipment in cutting industry.The intensive research topic about fiber laser cutting is introduced.Lastly,the current challenges with fiber laser cutting technology such as body security and the limit for thick steel plate cutting are discussed.%激光切割质量好,尺寸精度高,热影响小,在切割行业应用越来越广泛.通过对光纤激光切割机的介绍及其与二氧化碳激光切割机的对比,分析了光纤激光切割机在未来切割行业中的技术优势、结构优势、成本优势.光纤激光具有切割薄板速度快、能量集中、电光转化率高、柔性加工等众多优点.同时指出了目前光纤激光切割技术存在的安全问题及厚板切割局限性问题,提出了当前的一些解决方案及研究热点,并展望了光纤激光切割技术的发展前景.

  17. Effects of orange by-product fiber incorporation on the functional and technological properties of pasta

    Directory of Open Access Journals (Sweden)

    Tainara de Moraes Crizel

    2015-09-01

    Full Text Available AbstractThe incorporation of fiber into products consumed every day by the general population is important and viable. The aim of the present work was to evaluate the impact of incorporating orange juice industry dietary fiber byproducts in fettuccini of fresh pasta. Three different fiber concentrations were added to fresh pastas (25 g/kg, 50 g/kg and 75 g/kg. The results showed a significant increase in solid loss content when the incorporation of orange fiber was greater than 50 g/kg. This difference did not occur regarding weight increase values and color parameters. The pasta with 75 g/kg orange fiber can be considered a “high fiber” product, with the total dietary fiber content of the pasta increasing by 99% compared to control pasta. The carotenoid and phenolic contents of pasta increased significantly with the incorporation of fiber at 75 g/kg, but only the pasta formulation with 25 g/kg of orange fiber did not differ from control pasta in relation to all of the sensory attributes and presented an acceptance greater than 75%. The addition of orange fiber byproducts to pastas is an interesting alternative because fiber has a high nutritional value and an abundance of antioxidants.

  18. Application of cold plasma technology in fiber-reinforced composite materials

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    A study is presented concerning a cold plasma technique for improving the bondability of highstrength high-modulus multi-filament polyethylene fibers to polymer matrices and the fibers impregnation with the objective to fabricate composite materials (CMs). Strong bonding between the matrixes and reinforcing fibers during the production of composites appears in the case if interaction is chemical. The value of the activation energy of the chemical interaction for very high performance polyethylene fiber was estimated. It was 1.14 eV. This allows using the cold plasma technique for producing CMs. In order to understand the effect of cold plasma treatment treated and untreated fibers were used to fabricate CMs. The strong bond between the matrix and plasma-activated fibers affects both the properties and failure mode of composite. The properties and failure modes were compared to those of CMs reinforced with untreated fibers. After plasma treatment the properties of CMs are increased. CMs are broken as a unit whole under tension. The ideas of the activating the fibers by cold plasma treatment above the activation energy of the chemical interaction may be extended over other types of the fibers and matrices to produce new types of fiber-reinforced composite materials with high physicomechanical indices.

  19. Application of fiber Bragg grating sensing technology in long-distance detection of temperature in weapon depots

    Science.gov (United States)

    Xu, Jianguo; Zhang, ZhiLi; Zhao, Bing; Fu, Zhulin

    2010-10-01

    Incessantly long-term real-time detection of temperature is demanded in weapon depots, where the weapon equipment is stored in, to realize the self-regulation of temperature. Long-Distance intellectualized control can be actualized by setting sensor-net which is composed by several temperature sensors to simultaneously detect multi-point and multi- parameter. The temperature sensors based on Fiber Bragg Grating Technology are more suitable for long-term detection for their preponderance in high sensitivity, small volume, anti-jamming and so on. The temperature sensing system, which is composed by several Fiber Bragg Grating sensors in one light-cable, can accomplish Quasi-Distributed measurement and is suitable for multi-point and multi- parameter detection. Basal principle of Fiber Bragg Grating sensing technology is expounded in the article, with a sensing system applied to the long-distance detection of temperature in the depots is designed based on F-P Scanning Method. Besides, DSP and FPGA are adopted pre-treat the transformed data from AD such as filter and determine threshold. The main modules of this demodulation system such as 1550nm exact photoelectric detection module and trigonal wave voltage scan module are designed in this paper to realize demodulation. Proved by the analysis of the testing data, the Fiber Bragg Grating temperature sensing system, whose testing precision achieved the design purpose, has advantages of real-time measure and long-term stability. The system, which provides guarantee to realize the auto-control of temperature, can be generalized and will provide favorable foundation for the broad using of Fiber Bragg Grating sensing technology in the army.

  20. Optical fiber chemical sensors with sol-gel derived nanomaterials for monitoring high temperature/high pressure reactions in clean energy technologies

    Science.gov (United States)

    Tao, Shiquan

    2010-04-01

    The development of sensor technologies for in situ, real time monitoring the high temperature/high pressure (HTP) chemical processes used in clean energy technologies is a tough challenge, due to the HTP, high dust and corrosive chemical environment of the reaction systems. A silica optical fiber is corrosive resistance, and can work in HTP conditions. This paper presents our effort in developing fiber optic sensors for in situ, real time monitoring the concentration of trace ammonia and hydrogen in high temperature gas samples. Preliminary test results illustrate the feasibility of using fiber optic sensor technologies for monitoring HTP processes for next generation energy industry.

  1. Wireless fiber laser sensor combining photonic generation beat frequency demodulation technology

    Science.gov (United States)

    Liu, Shengchun; Gu, Rong; Yu, Xiujuan; Yin, Zuowei; Chen, Xiangfei

    2011-12-01

    A simple wireless-fiber laser sensor is proposed base on directly photonic generation of microwave beat signal. In this scheme, a multi-longitudinal modes fiber laser is formed by two fiber Bragg gratings and a section of erbium-doped fiber. Two same 2G-GSM mobile antennas are used as wireless transmitter and receiver. By this method, the real-time monitoring of fiber laser sensors can be achieved through over ultra-long distance. This technique offers a simple, all-electrical and cheap way for fiber sensor information accessing wireless net. The experiment result shows the root mean square deviations of the sensor are about 4.7 μɛ and 6.7 μɛ at 2.38 GHz before and after wireless transmission, respectively.

  2. Optical power 1 × 7 splitter based on multicore fiber technology

    Science.gov (United States)

    Pytel, Anna; Napierała, Marek; Szostkiewicz, Łukasz; Ostrowski, Łukasz; Murawski, Michał; Mergo, Paweł; Nasiłowski, Tomasz

    2017-09-01

    Multicore and microstructured fibers open a new door for designing all-fiber telecom components. In this article we propose a design of an optical power splitter based on the phenomenon of power coupling in the tapered splice between a single-core (SMF-28) and a seven core fiber (MCF-7), which was originally developed for spatial division multiplexing telecommunication systems. Comprehensive numerical analysis is presented and backed up with an experimental demonstration.

  3. Fusion splicing of double-clad specialty fiber using active alignment technology

    Institute of Scientific and Technical Information of China (English)

    Shupeng Yin; Ping Yan; Mali Gong; Jianwei He; Chen Fu

    2011-01-01

    @@ The fusion splicing of double-clad (DC) specialty fibers based on active alignment is crucial to the investigation of high-power monolithic fiber lasers. Given the wave-guiding characteristic of DC fiber, a light stripper is introduced in an active alignment experiment. We propose a novel method for stripping light that is convenient, highly efficient, and low cost. This method is also effective for low-numerical-aperture beams that escape from the fiber core. A splice loss as low as 0.05 dB is achieved.%The fusion splicing of double-clad (DC) specialty fibers based on active alignment is crucial to the investigation of high-power monolithic fiber lasers. Given the wave-guiding characteristic of DC fiber, a light stripper is introduced in an active alignment experiment. We propose a novel method for stripping light that is convenient, highly efficient, and low cost. This method is also effective for low-numerical-aperture beams that escape from the fiber core. A splice loss as low as 0.05 dB is achieved.

  4. Mode division multiplexing technology for single-fiber optical trapping axial-position adjustment.

    Science.gov (United States)

    Liu, Zhihai; Wang, Lei; Liang, Peibo; Zhang, Yu; Yang, Jun; Yuan, Libo

    2013-07-15

    We demonstrate trapped yeast cell axial-position adjustment without moving the optical fiber in a single-fiber optical trapping system. The dynamic axial-position adjustment is realized by controlling the power ratio of the fundamental mode beam (LP01) and the low-order mode beam (LP11) generated in a normal single-core fiber. In order to separate the trapping positions produced by the two mode beams, we fabricate a special fiber tapered tip with a selective two-step method. A yeast cell of 6 μm diameter is moved along the optical axis direction for a distance of ~3 μm. To the best of our knowledge, this is the first demonstration of the trapping position adjustment without moving the fiber for single-fiber optical tweezers. The excitation and utilization of multimode beams in a single fiber constitutes a new development for single-fiber optical trapping and makes possible more practical applications in biomedical research fields.

  5. Research on Structural Stress Optical Fiber Testing Technology Based on Brillouin Scattering

    Directory of Open Access Journals (Sweden)

    Wang Xian-Jin

    2016-01-01

    Full Text Available In this paper, the principle of distributed optical fiber measurement and measurement of axial stress is introduced by analyzing the principle of Brillouin scattering in an optical fiber with a certain power. Making the experimental device, measuring the individual strain model, analyzing the wave shape of the scattered wave, and preliminary understanding of the image characteristics of the stress in the optical fiber Brillouin scattering spectrum. The effect of stress on the different position of the fiber, and the difference between them and the scattering waveform obtained from the stress free action poetry are compared, and the effect of the light pulse on the optical fiber transmission is studied. The results show that the effect of the stress is different in the position of the action, and the effect of the propagation of the pulse light is mainly affected by the Stokes and anti Stokes light scattering. The research can provide reference for distributed optical fiber measurement, and it can promote the application of distributed optical fiber in measuring micro deformation. The innovative point of this study is to use the pulley method to solve the effect of the different position of the same stress in the distribution of optical fiber.

  6. Optical fiber grating based technologies and their applications: from nuclear fusion to medical

    NARCIS (Netherlands)

    Cheng, L.K.; Vliegenhart, W.A.; Habisreuther, T.

    2012-01-01

    In the last decades, Fiber Optic (FO) sensor has gained increasing acceptance. Among the different FO sensor types, Fiber Bragg Grating is most widely used due to its commercial availability and the unique multiplexing potential. The latter feature enables the development of large sensor array and/o

  7. Coverage Range and Cost Comparison of Remote Antenna Unit Designs for In-building Radio over Fiber Technology

    Directory of Open Access Journals (Sweden)

    Razali Ngah

    2008-05-01

    Full Text Available Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fiber (RoF technology is one of the most important enabler in access network for the technologies. Adoption of RoF faces bottleneck in optoelectronics, that they are still expensive, high power consumption, and limited in bandwidth. To solve the problem, transceiver in remote antenna unit (RAU is developed, i.e. electroabsorption transceiver (EAT and asymmetric Fabry-Perot modulator (AFPM. This paper compares their coverage range and cost in providing WCDMA and WLAN services. Needed gain of RF amplifier for supporting picocell is also discussed.

  8. Diagnosis and therapy of 38 Budd-Chiari syndrome due to membrance obstruction of the hepatic veins%38例肝静脉膜型布加综合征诊治分析

    Institute of Scientific and Technical Information of China (English)

    孙振阳; 芮清峰; 刘允乐

    2013-01-01

    目的 探讨肝静脉膜型布加综合征(Budd-Chiari syndrome,BCS)的诊治方法.方法 38例患者均经彩超检查,疑为BCS患者行肝静脉、下腔静脉造影明确诊断后行经皮腔内血管成形(percutaneous intraluminal angioplasty,PTA)术或/和支架置入术.结论 38例患者中16例球囊扩张成功,19例支架置入,失败3例,无1例发生严重并发症.结论经皮腔内血管成形术、支架置入术是治疗肝静脉膜型 BCS的一种操作简单、安全有效的方法.%Objective To explore diagnosis and therapy of Budd -Chiari syndrome due to membrance obstruction of the hepatic veins . Methods All of the 38 patients were detected by colour doppler flow imaging , hepatic and inferior vena cava venography. Then percutaneous in-traluminal angioplasty or intravascular stent insertion was undergone . Results 16 patients underwent therapy of percutaneous intraluminal angioplasty ,and 19 patients underwent therapy of intravascular stent insertion successfully and 3 failed. Conclusion Percutaneous intraluminal angioplasty and intravascular stent insertion are safe and effective for BCS due to membrance obstruction of the hepatic veins .

  9. High Sensitivity Refractometer Based on TiO2-Coated Adiabatic Tapered Optical Fiber via ALD Technology

    Science.gov (United States)

    Zhu, Shan; Pang, Fufei; Huang, Sujuan; Zou, Fang; Guo, Qiang; Wen, Jianxiang; Wang, Tingyun

    2016-01-01

    Atomic layer deposition (ALD) technology is introduced to fabricate a high sensitivity refractometer based on an adiabatic tapered optical fiber. Different thicknesses of titanium dioxide (TiO2) nanofilm were coated around the tapered fiber precisely and uniformly under different deposition cycles. Attributed to the higher refractive index of the TiO2 nanofilm compared to that of silica, an asymmetric Fabry–Perot (F-P) resonator could be constructed along the fiber taper. The central wavelength of the F-P resonator could be controlled by adjusting the thickness of the TiO2 nanofilm. Such a F-P resonator is sensitive to changes in the surrounding refractive index (SRI), which is utilized to realize a high sensitivity refractometer. The refractometer developed by depositing 50.9-nm-thickness TiO2 on the tapered fiber shows SRI sensitivity as high as 7096 nm/RIU in the SRI range of 1.3373–1.3500. Due to TiO2’s advantages of high refractive index, lack of toxicity, and good biocompatibility, this refractometer is expected to have wide applications in the biochemical sensing field. PMID:27537885

  10. Application of optical fiber sensing technology in the hydraulic decoking monitoring system

    Science.gov (United States)

    Fan, Yun-feng; Tong, Xing-lin; Ji, Tao; Gao, Xue-qing; Zhong, Dong

    2013-09-01

    On the basis of the analysis of the current hydraulic decoking monitoring system, it is proposed that use optical fiber Bragg grating (FBG) vibration sensor and fiber Fabry-Perot (FP) acoustic sensors to online monitor vibration signal and audio signal hydraulic of the coke drum in the running state progress, analysis the vibration sensor and acoustic sensor used in the system. Based on the actual monitoring results in Sinopec Wuhan Branch , the fiber optic acoustic emission sensors is more suitable for the hydraulic decoking online monitoring system than the FBG vibration sensor ,which can more accurate monitor of hydraulic decoking.

  11. NASA Armstrong Flight Research Center (AFRC) Fiber Optic Sensing System (FOSS) Technology

    Science.gov (United States)

    Richards, Lance; Parker, Allen R.; Piazza, Anthony; Chan, Patrick; Hamory, Phil; Pena, Frank

    2014-01-01

    Attached is a power point presentation created to assist the Tech Transfer Office and the FOSS project team members in responding to inquiries from the public about the capabilities of the Fiber Optic Sensing System.

  12. High Speed and High Spatial Density Parameter Measurement Using Fiber Optic Sensing Technology

    Science.gov (United States)

    Parker, Allen R. Jr. (Inventor); Chan, Hon Man (Inventor); Richards, William Lance (Inventor); Piazza, Anthony (Inventor); Hamory, Philip J (Inventor)

    2017-01-01

    The present invention is an improved fiber optic sensing system (FOSS) having the ability to provide both high spatial resolution and high frequency strain measurements. The inventive hybrid FOSS fiber combines sensors from high acquisition speed and low spatial resolution Wavelength-Division Multiplexing (WDM) systems and from low acquisition speed and high spatial resolution Optical Frequency Domain Reflection (OFDR) systems. Two unique light sources utilizing different wavelengths are coupled with the hybrid FOSS fiber to generate reflected data from both the WDM sensors and OFDR sensors operating on a single fiber optic cable without incurring interference from one another. The two data sets are then de-multiplexed for analysis, optionally with conventionally-available WDM and OFDR system analyzers.

  13. Cryogenic Liquid Level-Sensing using Fiber-Optic Strain Sensor (FOSS) Technology Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Armstrong innovators have developed a highly accurate method for measuring liquid levels using optical fibers. Unlike liquid level gauges that rely on discrete...

  14. Green technology for durable finishing of viscose fibers via self-formation of AuNPs.

    Science.gov (United States)

    Emam, Hossam E; El-Hawary, Nancy S; Ahmed, Hanan B

    2017-03-01

    Sensitivity of dyes' colors to the surrounding environment causes lower durability and stability of color, which reflects the importance of durable finishing treatment. Current technique offered antimicrobial/durable finishing of viscose fibers through direct formation of AuNPs inside fibers macromolecules without using any external agents. By using the reducing properties of cellulose in viscose, Au(+3) was reduced to AuNPs and CHO/OH of cellulose subsequently were oxidized to COOH. For comparison, two different media were used; aqueous and alkaline. Increasing the reactivity and accessibility of cellulose macromolecules in alkali leaded to enlargement of the reduction process and more incorporation of AuNPs. Size of AuNPs inside fiber was recorded to be in range of 22-112nm and 14-100nm, in case of using aqueous and alkaline medium, respectively. Structure and properties of fibers were not changed by treatment according to XRD and ATR-FTIR data. The treated fibers were acquired durable violet color by the action of LSPR for AuNPs and darker color obtained using higher Au(+3) concentration. The treated fibers exhibited good inhibition against different pathogenic microbes including bacteria and fungi. One-pot, quite simple, inexpensive, green and industrial viable are the significant advantages of the current technique for viscose finishing (pigmentation and antimicrobial action). Copyright © 2016 Elsevier B.V. All rights reserved.

  15. Application of optical fiber sensing technology in the field of security%光纤传感技术在安防领域的应用

    Institute of Scientific and Technical Information of China (English)

    覃健文; 韦焕华

    2013-01-01

    On the basis of optical fiber sensing technology and its application was introduced briefly,optical fiber sensing technology application in security was described with emphasis,and proposed suggestion and forecast for practical process of optical fiber fence alarm system based on optical fiber sensing technology.%在简要介绍光纤传感技术及其应用的基础上,重点阐述了光纤传感技术在安防领域的应用,并对基于光纤传感技术的光纤围栏报警系统的实用化进程提出建议及展望.

  16. Research on the surveillance technology and the comprehensive management network system using the optical fiber about a road management system

    Science.gov (United States)

    Nakano, Masahiro; Okuno, Masatomi; Sasaki, Susumu; Yano, Koji

    2005-05-01

    In recent years, IT (Information Technology) has been utilized in various fields of civil engineering. Especially, trials have been made to utilize optical fibers as sensors to measure strain of civil engineering structures, ground deformation, temperature, etc., and they have been installed for measuring in road structures and civil engineering structures including tunnel, river, and cut-slope structures. In order to make such optical monitoring systems of civil engineering structures more general and organic systems, it would be effective to combine them with such comprehensive systems as ITS. We investigate checking systems utilizing GIS technology, etc. that can process and analyze an enormous amount of data in real time and also investigate the construction of general monitoring systems of road facilities which can perform thorough management from monitoring to maintenance utilizing information technology networks.

  17. Interactive educational technologies as a method of communicative competency development of optical and fiber optic communication systems specialists

    Science.gov (United States)

    Matveeva, Tatiana U.; Osadchiy, Igor S.; Husnutdinova, Marina N.

    2017-04-01

    The article examines the process of formation of communicative competencies of optic and fiber optic communication systems specialists; the role of communicative competencies is examined in the structure of professionally important skills, together with the contents of professional activity. The stages of empirical research into formation of communicative competencies have been presented, and the values of statistical reliability of data have been provided. The model of formation of communicative competency using interactive technology has been developed based on the research done, and main stages of model implementation and motives of formation of communicative competency have been highlighted. A scheme of "Communicative competence as a base of future success" training session has been suggested as one of the basic interactive technologies. Main components of education that are used during the stages of the training cycle have been examined. The statistical data on the effectiveness of use of interactive educational technologies has been presented; it allowed development of communicative competency of specialists in the field of optical and fiber optic communication system.

  18. Photonic liquid crystal fibers tuning by four electrode system produced with 3D printing technology

    Science.gov (United States)

    Ertman, Slawomir; Bednarska, Karolina; Czapla, Aleksandra; Woliński, Tomasz R.

    2015-09-01

    Photonic liquid crystal fiber has been intensively investigated in last few years. It has been proved that guiding properties of such fibers could be tuned with an electric field. In particular efficient tuning could be obtained if multi-electrode system allowing for dynamic change of not only intensity of the electric field, but also its direction. In this work we report a simple to build four electrode system, which is based on a precisely aligned four cylindrical microelectrodes. As an electrodes we use enameled copper wire with diameter adequate to the diameter of the fiber to be tuned. To ensure uniform and parallel alignment of the wires a special micro-profiles has been designed and then produced with filament 3D printer. The possibility of the dynamic change of the electric field direction in such scalable and cost effective electrode assembly has been experimentally confirmed.

  19. The competitive status of the U.S. fibers, textiles and apparel complex: a study of the influences of technology in determining international industrial competitive advantage

    National Research Council Canada - National Science Library

    Committee on Technology and International Economic and Trade Issues

    1983-01-01

    ... of the Influences of Technology in Determining International Industrial Competitive Advantage Prepared by the Fibers, Textiles, and Apparel Industry Panel, Committee on Technology and International Economic and Trade Issues of the Office of the Foreign Secretary, National Academy of Engineering and the Commission on Engineering and Technical...

  20. Fiber Optic 3-D Space Piezoelectric Accelerometer and its Antinoise Technology

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The mechanical structure of piezoelectric accelerometer is designed, and the operation equations on X-, Y-, and Z-axes are deduced. The test results of 3-D frequency response are given. Noise disturbances are effectively eliminated by using fiber optic transmission and synchronous detection.

  1. Laser & Fiber Optics: Instructional Manual. The North Dakota High Technology Mobile Laboratory Project.

    Science.gov (United States)

    Eickhoff, Luvern R.

    This instructional manual contains 20 learning activity packets for use in a workshop on lasers and fiber optics. The lessons cover the following topics: what a laser; coherent light; setting up the laser; characteristics of the laser beam; scattering of light; laser beam divergence, intensity, color, ophthalmology, and reflections; directivity of…

  2. Laser & Fiber Optics: Instructional Manual. The North Dakota High Technology Mobile Laboratory Project.

    Science.gov (United States)

    Eickhoff, Luvern R.

    This instructional manual contains 20 learning activity packets for use in a workshop on lasers and fiber optics. The lessons cover the following topics: what a laser; coherent light; setting up the laser; characteristics of the laser beam; scattering of light; laser beam divergence, intensity, color, ophthalmology, and reflections; directivity of…

  3. Innovation on Energy Power Technology (24)Development of Composite Fiber-Optic Ground Wire

    Science.gov (United States)

    Hanada, Toshiki; Tamura, Kiyoshi

    In correspondence with the development of the high information-oriented society, macroscale of the information voltage by the optical fiber is planned. In such situation, it is OPGW forming the basis of the current communication. I introduce process about this development.

  4. 基于玻璃态膜组件的油气污染排放控制技术研究%Experimental research of oil vapor pollution control with galssy membrane separation technology

    Institute of Scientific and Technical Information of China (English)

    朱玲; 陈家庆; 张宝生; 王建宏; 赵岩

    2011-01-01

    针对加油站收油和发油过程中产生的油气污染,采用新型的玻璃态油气截留型PEEK中空纤维膜组件,在自行设计建造的膜分离设备上,分别考察了膜组件和整个膜系统对油气污染治理和回收的效果,提出了一种研究膜法油气回收过程的新思路。对于膜组件的分离实验结果发现,处理流量在2.5~7.5 m3/h、系统压力在525~825 Pa之间的中试规模运行条件下,膜组件对油气-氮气混合气有很好的净化能力,尾气能够达标排放;在渗余的富油气返回油罐的模拟加油站实际运行情况的循环实验条件下,尾气也低于25g/m3的国标。%A new type of vapor retained galssy membrance, which was based on PEEK hollow fiber membranes , was used to control the oil vapor pollution during the course of receieving and transfering gasoline in oil stations. The efficiencies of the membrance module and the membrance system were evaluated respectively in the facalities which were designed and set up by ourselves, and the results of these experiments may provide a new method for membrance seperation on oil vapor recovery. It was found that the membrance module had high efficiency for the seperation of VOCs-N2 mixed gases, with the operational capacity from 2. 5 mVh to 7. 5 mVh and the systemic pressure from 525 Pa to 825 Pa. The outlet vapor after treatment can meet the national standard. When the residue vapor-enriched gas was returned to the oil tank to simulate the continuously cycle test, the concentration of VOCs in the outlet was also below 25 g/m3.

  5. Advances in Fiber Optic Sensors Technology Development for temperature and strain measurements in Superconducting magnets and devices

    CERN Document Server

    Chiuchiolo, A.; Bajko, M.; Bottura, L.; Consales, M.; Cusano, A.; Giordano, M.; Perez, J. C.

    2016-01-01

    The luminosity upgrade of the Large Hadron Collider (HL-LHC) requires the development of a new generation of superconducting magnets based on Nb3Sn technology. In order to monitor the magnet thermo-mechanical behaviour during its service life, from the coil fabrication to the magnet operation, reliable sensing systems need to be implemented. In the framework of the FP7 European project EUCARD, Nb3Sn racetrack coils are developed as test beds for the fabrication validation, the cable characterization and the instrumentation development. Fiber optic sensors (FOS) based on Fiber Bragg Grating (FBG) technology have been embedded in the coils of the Short Model Coil (SMC) magnet. The FBG sensitivity to both temperature and strain required the development of a solution able to separate the mechanical and temperature effects. This work presents the feasibility study of the implementation of embedded FBG sensors for the temperature and strain monitoring of the 11 T type conductor. We aim to monitor and register these...

  6. Applications of nonlinear fiber optics

    CERN Document Server

    Agrawal, Govind

    2008-01-01

    * The only book describing applications of nonlinear fiber optics * Two new chapters on the latest developments: highly nonlinear fibers and quantum applications* Coverage of biomedical applications* Problems provided at the end of each chapterThe development of new highly nonlinear fibers - referred to as microstructured fibers, holey fibers and photonic crystal fibers - is the next generation technology for all-optical signal processing and biomedical applications. This new edition has been thoroughly updated to incorporate these key technology developments.The bo

  7. 浅论光纤通信技术的特点与应用%On the Characteristics and Applications of Optical Fiber Communication Technology

    Institute of Scientific and Technical Information of China (English)

    徐澜涛; 姜其政

    2015-01-01

    At present, optical fiber communication technology has been integrated into power, military and other industries. China's optical fiber communications industry has achieved fruitful results, but it does not explain China has fully mastered the optical fiber communication technology; it still needs careful analysis of the relevant characteristics of optical fiber communication technology so as to make optical fiber communication technology better play its role.%目前,光纤通信技术已经融入到电力、军事等多种行业中。我国光纤通信行业已取得丰硕成果,但并不能说明我国已经完全掌握了光纤通信技术,仍需认真分析光纤通信技术的相关特点,让光纤通信技术更好的发挥其作用。

  8. Research progress in modification technology for hygroscopic polyacrylonitrile fiber%聚丙烯腈纤维吸湿改性方法及研究现状

    Institute of Scientific and Technical Information of China (English)

    王雅珍; 徐岽双; 王海霞; 曹孔明

    2011-01-01

    The research status of hygroscopic polyacrylonitrile ( PAN) fibers was reviewed in China and abroad. The hygroscopic mechanism and the influential factors bearing upon the hygroscopicity of PAN fiber were described. The chemical and physical technologies for improving the hygroscopicity of PAN fiber were introduced in details. The chemical technolgies included hydro-philic group introduction by polymerization and copolymerization, grafting copolymerization with hydrophilic material, alkali decrement treatment or hydrophilic finishing on the fiber surface, plasma treatment. The physical technologies included blending with hydrophilic material, fiber micropore formation, fiber cross section shaping, fiber surface roughening. It was pointed out that the development trend of PAN fiber should be focused on PAN fibers with favorable hygroscopicity and clothing comfort.%综述了国内外吸湿性聚丙烯腈(PAN)纤维的研究现状;阐述了PAN纤维的吸湿机理及影响吸湿性的因素;详细介绍了改善PAN纤维的吸湿性的化学方法和物理方法;PAN纤维吸湿改性化学方法有通过聚合和共聚引进亲水基团、与亲水物质接枝共聚、对纤维表面进行碱减量处理、纤维表面的亲水整理、等离子体处理等;PAN纤维吸湿改性物理方法有与亲水性物质共混、纤维结构微孔化、纤维截面异形化和表面粗燥化等;指出开发吸湿性能好、服用舒适的PAN纤维是今后PAN纤维的主要发展方向.

  9. High power fiber lasers

    Institute of Scientific and Technical Information of China (English)

    LOU Qi-hong; ZHOU Jun

    2007-01-01

    In this review article, the development of the double cladding optical fiber for high power fiber lasers is reviewed. The main technology for high power fiber lasers, including laser diode beam shaping, fiber laser pumping techniques, and amplification systems, are discussed in de-tail. 1050 W CW output and 133 W pulsed output are ob-tained in Shanghai Institute of Optics and Fine Mechanics, China. Finally, the applications of fiber lasers in industry are also reviewed.

  10. The Status and Trend of Pineapple Leaf Fiber Degumming Technology%菠萝叶纤维脱胶技术的现状与发展方向

    Institute of Scientific and Technical Information of China (English)

    杨美萍; 张劲; 何俊燕

    2012-01-01

    Necessity and urgency of pineapple leaf fiber degumming technology research were expounded in the paper.Firstly,the advantages and disadvantages of the present methods of pineapple leaf fiber degumming——chemical degumming,biological degumming,and biochemical joint degumming——were analysed.Secondly,the relationship between the characteristics of pineapple leaf fiber and degumming were expounded in view of the structure characteristics and chemical properties of pineapple leaf fiber."low consumption,high efficiency,high quality,less pollution" pineapple leaf fiber degumming technology were pointed out.Finally,a new method of pineapple leaf fiber degumming was put forward.%分析了几种现有的菠萝叶纤维脱胶方法及其优缺点,从菠萝叶纤维的结构特点和化学性能方面,阐述其与脱胶的关系.提出菠萝叶纤维脱胶技术应向着"优质、高效、低耗、少污染"方向发展的必要性,并据此提出一种新的脱胶方法———机械脱胶.

  11. Mode-converter and multiplexer based on SOI technology for few-mode fiber at 1550 nm

    Science.gov (United States)

    Garcia-Rodriguez, David; Corral, Juan L.; Griol, Amadeu; Llorente, Roberto

    2017-01-01

    The Asymmetric Directional Coupler (ADC) based on SOI (Silicon-on-Insulator) technology converts and couples the fundamental mode to the first higher order mode. The ADC is designed to achieve phase-matching condition, which is accomplished when both propagation constants are equal in each waveguide arm. Devices are fabricated in a SOI wafer with a 220 nm thick silicon layer. The refractive indexes of Si and SiO2 are nSi=3.47 and nSi02=1.46 respectively. The access waveguides (W1=0.45 μm) have been designed to propagate just the fundamental mode, TE0. The optimum width for the second waveguide was chosen to achieve the phase-matching condition for the TE1 mode, which corresponds to W2=0.962 μm. The coupling to the input and output waveguides is achieved through grating couplers. The input grating coupler will need to couple the LP01 mode from the SSMF (Standard Single-Mode Fiber) to the TE0 mode in the SOI waveguide; thus a typical design for a SOI coupler can be used. However, the output coupler must simultaneously couple the TE0 and TE1 modes in the SOI wide waveguide to the LP01 and LP11 modes in the FMF (Few-Mode Fiber). Input gratings are designed to have an area of 12x12 μm2 and a period of Λ=610 nm in order to maximize the optical power coupled between the fiber and the waveguide for an incident angle of 10 degrees. Output gratings are designed with the same period but distinct area (12.5x12.5 μm2) to correctly couple the LP01 and LP11 modes in the FMF.

  12. A new automatic alignment technology for single mode fiber-waveguide based on improved genetic algorithm

    Institute of Scientific and Technical Information of China (English)

    ZHENG Yu; CHEN Zhuang-zhuang; LI Ya-juan; DUAN Jian

    2009-01-01

    A novel automatic alignment algorithm of single mode fiber-waveguide based on improved genetic algorithm is proposed. The genetic searching is based on the dynamic crossover operator and the adaptive mutation operator to solve the premature convergence of simple genetic algorithm The improved genetic algorithm combines with hill-climbing method and pattern searching algorithm, to solve low precision of simple genetic algorithm in later searching. The simulation results indicate that the improved genetic algorithm can rise the alignment precision and reach the coupling loss of 0.01 dB when platform moves near 207 space points averagely.

  13. Fiber Bragg Grating Sensor as Valuable Technological Platform for New Generation of Superconducting Magnets

    CERN Document Server

    Chiuchiolo, A; Cusano, A; Bajko, M; Perez, J C; Bajas, H; Viret, P; Giordano, M; Breglio, G

    2014-01-01

    New generation of superconducting magnets for high energy applications designed, manufactured and tested at the European Organization for Nuclear Research (CERN) require the implementation of reliable sensors able to monitor the mechanical stresses affecting the winding from fabrication to operation in magnetic field of 13 T. This work deals with the embedding of Fiber Bragg Grating sensors in a short model Nb3Sn dipole magnet in order to monitor the strain developed in the coil during the cool down to 1.9 K, the powering up to 15.8 kA and the warm up, offering perspectives for the replacement of standard strain gauges.

  14. Micro- and Nano-fibers by Electrospinning Technology: Processing, Properties, and Applications

    DEFF Research Database (Denmark)

    Chronakis, Ioannis S.

    2015-01-01

    Micro- and nano-structures such as micro- and nano-fibers and micro- and nano-particles based on polymers (synthetic and natural) can be processed by electrospinning. Electrospun micro- and nano-structures are an exciting class of novel materials due to several unique characteristics, including......-structures may serve as a highly versatile platform for a broad range of applications in areas such as medicine, pharmacy, sensors, catalysis, filter, composites, ceramics, packaging, electronics, and photonics. Some latest developments in the processing and applications of micro- and nano-structured polymers...

  15. 碳纤维制造产业的专利分析%Analysis of patents on carbon fiber manufacturing technology

    Institute of Scientific and Technical Information of China (English)

    冀小强; 易方方

    2012-01-01

    对碳纤维制造技术专利文献进行了检索统计,分别从年度发展趋势、专利申请国分布、申请人状况和中美日欧四局共同申请的重点专利布局等方面对碳纤维制造产业的国内外技术专利进行了分析,揭示了国内外碳纤维专利申请的现状,分析了主要专利申请人专利的国际专利分类领域和技术重点,为我国科研院所和企业提出了专利申请布局的相关建议.提出了我国应利用已公开的专利技术,研发特种碳纤维的制造技术,强化碳纤维的应用技术,促进碳纤维的产业化和工程化.%The relevant patents of carbon fiber manufacturing technologies were retrieved. The China and international patents on carbon fiber manufacturing technologies were analyzed from the aspects of annual trend and geographical spread of patent applications, statistics of patent applicants, distribution of key patents filed in US, Japan, Europe and China patent offices. The status of carbon fiber patent application was explored is China and abroad. The international classification and focal points of patent technology were analyzed according to the dominant patent applicants. Some suggestion on the patent application strategy was put forward for China science research institutes and enterprises. It was pointed out that China should develop the manufacturing technology of special carbon fiber, strengthen the application technology and stimulate the industrialization and engineering technology of carbon fiber using the published patent technologies.

  16. Development of Optical Fiber Technology in Poland, International Journal of Electronics and Telecommunication, vol. 57, no 2, pp.191-197, July 2011

    CERN Document Server

    Dorosz, J

    2011-01-01

    In this paper, the authors, chairmen of the 13th Conference on Optical Fibers and Their Applications OFA2011, and editors of the conference proceedings summarize the development of optical fiber technology in Poland (during the period of 2009- 2011) on the basis of papers presented there and consecutively published in this volume. The digest is thus not full but covers the periodically presented material every 18 months during the meetings on optical fibers in Białystok-Białowie˙za and Lublin- Krasnobród. OFC systems are developed for HEP experiments and accelerators. OFC systems are also developed for virtual atomic clocks. EuCARD information presentation was organized during this meeting. Keywords— optical fibers, optical communication systems, photonic sources and detectors, photonic sensors, integrated optics, photonics applications, photonic materials.

  17. Functional design and implementation with on-line programmable technology in optical fiber communication pulse code modulation test system

    Science.gov (United States)

    Xu, Yuan; Ding, Huan; Gao, Youtang

    2010-10-01

    In order to complete the functional design in the fiber optical communication pulse code modulation test system, taking advantage of CPLD / FPGA and SOPC technology, software solutions used to design system hardware features and control functions, thereby the whole system could attain optimisation in the logic control as well as encoding and decoding functional designs on the motherboard, enabling this system fulfill the capacities varying from simple digital simulation transmission modulate to the high speed fiber optical communication network information encoding and decoding functions. Simultaneously the application of logarithmic pressure companding technique, PCM encoding and decoding system to improve the small signal quantizing SNR(Signal-to-Noise Ratio), TP3067 adopting A rate thirteen broken lines to carry on signal pressure companding. When the signal at a certain stage, the quantizing SNR is invariable(as signal receives uniform quantization in this phase, therefore the quantizing SNR drops along with signal amplititude decreasing). Test results are as follows: ideal various signal encoding and decoding system waveforms, high performance parameters , achieve the desired designing aim, a entirely new approach to realize different kinds of information encoding and decoding model building and implementation, saving development costs, improving design efficiency, satisfactory actual results, stable operation.

  18. Rare Earth Doped Optical Fibers for Temperature Sensing Utilizing Ratio-Based Technology

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    A new and practical fluorescence temperature detecting system based on fluorescence intensity ratio was proposed. The background theory of fluorescence intensity-ratio method was presented simply. And the characters of rare earth doped samples were detailed. The erbium-doped fiber was chosen as the sensing element. The energy levels of 2H11/2 and 4S3/2 are responsible for the emission of radiation at approximately 530 and 555 nm. The erbium-doped (960 ppm) fiber of length 20 cm and core diameter 3.2 μm was used as the sensing part. A silica photodiode transfers the fluorescence signal to electric signal, then the ratio of the average of the two different signals was calculated by the computer and the temperature was obtained. The ratio R of the intensity resulting from the transition between the two levels varies proportionly with temperature interval from 293 K to 373 K. The sensitivity of the sensor is approximately 0.05 K-1.

  19. Fiber technology in space maintainer: a clinical follow-up study.

    Science.gov (United States)

    Saravanakumar, M S; Siddaramayya, Jayaraman; Sajjanar, Arunkumar B; Godhi, Brinda Suhas; Reddy, N Simhachalam; Krishnam, Raju P

    2013-11-01

    Various space maintainers are used in pediatric dentistry. However, their construction requires time consuming laboratory procedures. Recently fiber-reinforced composite resin (FRCR) has been introduced for various application in dentistry. Polyethylene fibers appear to have the best properties in elasticity, translucency, adaptability, tenaciousness, resistance to traction and to impact. The purpose of this study was to clinically evaluate the long-term effect of FRCR space maintainer made with Ribbond(®) bondable reinforcement ribbon in children over a period of 18 months. A total of thirty FRCR space maintainers were applied to 30 children between the age group of 6 to 9 years old, follow-up visits were done at 1, 6, 12 and 18 months. The data obtained was subjected to statistical analysis. Maxillary appliances survived more than mandibular appliances. Mean survival time of space maintainer were found to be 12 months (minimum 1 and maximum 18 months). The present study suggested that FRCR space maintainers (Ribbond(®)), which was observed for up to 18 months, can be accepted as a successful alternative to conventional band-loop space maintainer only for short periods.

  20. Fabricating Optical Fiber Imaging Sensors Using Inkjet Printing Technology: a pH Sensor Proof-of-Concept

    Energy Technology Data Exchange (ETDEWEB)

    Carter, J C; Alvis, R M; Brown, S B; Langry, K C; Wilson, T S; McBride, M T; Myrick, M L; Cox, W R; Grove, M E; Colston, B W

    2005-03-01

    We demonstrate the feasibility of using Drop-on-Demand microjet printing technology for fabricating imaging sensors by reproducibly printing an array of photopolymerizable sensing elements, containing a pH sensitive indicator, on the surface of an optical fiber image guide. The reproducibility of the microjet printing process is excellent for microdot (i.e. micron-sized polymer) sensor diameter (92.2 {+-} 2.2 microns), height (35.0 {+-} 1.0 microns), and roundness (0.00072 {+-} 0.00023). pH sensors were evaluated in terms of pH sensing ability ({le}2% sensor variation), response time, and hysteresis using a custom fluorescence imaging system. In addition, the microjet technique has distinct advantages over other fabrication methods, which are discussed in detail.

  1. Study on the mixed fiber technology of three-component FDY%3组分FDY混纤技术的研究

    Institute of Scientific and Technical Information of China (English)

    张明成

    2015-01-01

    3组分FDY混纤纺丝设备采用全并列形式,既并列纺丝箱、并列侧吹风、并列纺丝甬道、并列油轮、并列GR1 ,经第一网络合股后进入GR2牵伸,然后经导丝盘和第二网络卷绕成3组分的混纤纤维,从而生产出兼顾各种组分纤维特性和纤维复合新特性的高性能的混纤纤维,本文以生产高收缩涤纶、锦纶6和涤纶三角异形混纤纤维为例,论述了该设备的特点和相关工艺的设定方法.%The spinning equipments were adopted as full parallel form for mixed FDY that consists of three compo-nents,it including parallel spin beam, parallel quencher, parallel spinning channel, parallel oiling wheel, parallel GR1,after the first interlacer,the yarn was jointed into the GR2 for drawing,and then pass the godet and second in-terlacer,the mixed fiber was winded into three components fiber,so as to produce the high performance mixed fiber both has each component fiber properties and fiber composite new properties. Based on the production of mixed fiber that consists of high shrinkage polyester fiber,nylon 6 fiber and the triangular cross-section polyester fiber as an ex-ample,the setting method of the characteristics of the equipment and the related technology was discussed.

  2. TECHNOLOGICAL IMPERFECTIONS OF FORCE ROD GEOMETRICAL PARAMETERS FOR PANDA OPTICAL FIBERS PRODUCTION

    Directory of Open Access Journals (Sweden)

    N. V. Semenov

    2014-01-01

    Full Text Available The paper deals with the dependence in radial dimensions changes of the workpieces on the angular coordinate based on experimental data about the geometry of the cross-sections of force rods batch for the production of anisotropic Panda-type optical fibers. An algorithm of geometrical parameters statistical processing is described, which gives the possibility to find the similarity in the geometry of the cross-sections of different force rods, and reveal the characteristic shape of the crosssection for all the samples. The algorithm contains the shift of points for dependence changes in radial dimensions of the workpieces on the angular coordinate in order to find curves with maximum correlation coefficient. Afterwards, the distribution of the radius values for each angular coordinate is found basing on the obtained curves. It is demonstrated that in case of the force rods production with variable amount of alloying dopes on the radius via the MCVD method, it is impossible to get

  3. Aeroelastic Control of a Segmented Trailing Edge Using Fiber Optic Strain Sensing Technology

    Science.gov (United States)

    Graham, Corbin Jay; Martins, Benjamin; Suppanade, Nathan

    2014-01-01

    Currently, design of aircraft structures incorporate a safety factor which is essentially an over design to mitigate the risk of structure failure during operation. Typically this safety factor is to design the structure to withstand loads much greater than what is expected to be experienced during flight. NASA Dryden Flight Research Centers has developed a Fiber Optic Strain Sensing (FOSS) system which can measure strain values in real-time. The Aeroelastics Lab at the AERO Institute is developing a segmented trailing edged wing with multiple control surfaces that can utilize the data from the FOSS system, in conjunction with an adaptive controller to redistribute the lift across a wing. This redistribution can decrease the amount of strain experienced by the wing as well as be used to dampen vibration and reduce flutter.

  4. Hollow fiber liquid-supported membrane technology for enantioseparation of racemic salbutamol by combinatorial chiral selectors

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Enantioseparation of salbutamol solute was carried out in liquid-supported membrane by using a polyvinylidene fluoride hollow-fiber module. The enantioselective transport of solute was facilitated by combinatorial chiral selectors, which were dissolved in toluene organic solvent. The effects of molar concentration ratios of salbutamol to combinatorial chiral selectors, and the pH value of buffer solution on enantioseparation were investigated. The results show that when the molar concentration ratio is 2: 1:1, the maximum separation factor and enantiomer excess are 1.49 and 19.74%, respectively, and the R-enantiomer flux is more than S-enantiomer; the pH value of buffer solution influences the performances of enantioseparartion obviously, and the appropriate range of pH value is7.0-7.2.

  5. 应用超声波技术染天然纤维%Study on the application of ultrasonic technology in dyeing of natural fibers

    Institute of Scientific and Technical Information of China (English)

    张海燕; 袁学会

    2014-01-01

    The characteristics, development and application on natural fibers of ultrasound technology were introduced. The future development of ultrasonic technology was put forward.%介绍了超声波技术染色的特点、超声波技术的发展情况及在天然纤维上的应用,并对超声波的发展进行了展望。

  6. 相变储能纤维制备技术的研究进展%Research progress in production technology for phase change energy storage fiber

    Institute of Scientific and Technical Information of China (English)

    张鸿; 王倩倩; 相恒学

    2011-01-01

    概述了相变储能纤维对相变材料的要求及其调温机理;详述了相变储能纤维的制备技术,主要包括复合纺丝法、中空填充法及织物涂层法等;分析了我国开发相变储能纤维的技术瓶颈;展望了相变储能纤维应用前景;指出今后应重点开发以聚合物基体为骨架的新型相变材料,提高相变材料密度,完善纺丝工艺,实现相变储能纤维的产业化.%The raw material requirement and temperatureadapting mechanism of phase change energy storage fiber were described. The production technology for phase change energy storage fiber was introduced in details, dominantly including composite spinning process, hollow filling method, fabric coating method. The technological bottleneck of phase change energy storage fiber development was analyzed in China. The application prospects of phase change energy storage fiber were outlooked. The research should focus on the development of novel phase change materials using polymer matrix as framework, the improvement of phase change material density and spinning process and the industrialization of phase change energy storage fiber in the future.

  7. Headline:Key Technology Development of Fiber Preparation from Seaweed Resources and Deep Processing%海藻资源制取纤维及深加工关键技术开发

    Institute of Scientific and Technical Information of China (English)

    夏延致; 王兵兵; 全凤玉; 纪全; 隋坤艳

    2016-01-01

    The project aims at seaweed chemical industry sustainable development, and spinning preparation and application technology innovation of alginate fibers. The project was simultaneously carried out from two aspects, namely, the aspect of key technology improvement of fiber-grade sodium alginate extraction and alginate fiber spinning, and the aspect of technology integration and the industrialized demonstration of spinning preparation. By aiming at the special requirements of alginate fiber spinning preparation for sodium alginate technical indexes, aiming at the complexity of fiber spinning and the complexity of textile processing and application, combining the existing pilot-scale study foundation, taking quality of fiber-grade sodium alginate products and alginate fiber products, energy conservation and emission reduction, and the industrialized key technology improvement as main investigation indexes, and focusing on carrying out in-depth study and system integration from three aspects, namely, the aspect of the key technology of fiber-grade sodium alginate, the aspect of spinning preparation technology integration and the industrialized demonstration, and the aspect of textile processing and application; a batch of national invention patents are formed, a batch of important independent innovation achievements are achieved, and therefore technical reserves are provided for technical transformation and industrial upgrading of the alga chemical industry and the fiber textile industry, energy conservation and emission reduction, and the improvement of the overall industrial technological level. A series of national and industrial production technical standards are formed, and therefore technical support is provided for the sustainable development of the alga chemical industry and the fiber textile industry. Several cooperative enterprises are combined to establish the Qingdao Kang Tong Ocean Fiber Co., Ltd which is special for carrying out industrial production and

  8. Physics Teacher Candidates' Opinions on Fiber Optics and New Technologies in This Field

    Science.gov (United States)

    Çildir, Sema

    2016-01-01

    Factors such as innovations brought in by the developing technology, also rapidly changing social structures casted various roles to both the student and the teacher. Therefore, it is necessary to associate such knowledge acquired in courses with implications of the knowledge in our real lives and to constantly enrich course contents, namely to…

  9. The Fiber Optic Connection.

    Science.gov (United States)

    Reese, Susan

    2003-01-01

    Describes the fiber optics programs at the Career and Technical Center in Berlin, Pennsylvania and the Charles S. Monroe Technology Center in Loudoun County, Virginia. Discusses the involvement of the Fiber Optic Association with education, research and development, manufacturing, sales, distribution, installation, and maintenance of fiber optic…

  10. New Developments on Eco-friendly Cellulose Fibers Technology%再生纤维素纤维绿色环保技术新进展

    Institute of Scientific and Technical Information of China (English)

    芦长椿

    2013-01-01

    纤维素是重要的可再生纤维原料。改善再生纤维素纤维生产的可持续性,减少对环境的冲击是再生纤维素纤维生产商的重要任务。本文重点介绍了近年来再生纤维素纤维技术的新进展,主要包括熔纺再生纤维素纤维、生物酶纤维素直接纺丝工艺、原纤化制纳米纤维素纤维以及高附加值铜氨纺粘非织造技术等,并对我国以粘胶纤维生产为主的再生纤维素纤维行业提出了环境友好发展建议。%Cellulose is an important renewable resource for chemical fiber industry. For regenerated cellulose fiber producers, it is an unavoidable responsibility to improve the sustainability of products and reduce the environment impact of the process. Based on eco-friendly concept, this article introduced some advanced technologies and products of regenerated cellulose fiber, including melt spinning cellulose-based fiber, nano-fibrillated fibers and high value-added spunbond nonwovens with cuprammonium fiber, etc. Furthermore, the author also gave some suggestions on the sustainable development of domestic regenerated cellulose fiber industry, especially the viscose fiber industry.

  11. Research on one-piece structure target flow sensing technology based on fiber Bragg grating

    Science.gov (United States)

    Liu, Chuntong; Zhang, Zhengyi; Li, Hongcai; He, Zhenxin; Zhao, Xiaofeng; Wu, Rongjing

    2016-12-01

    In view of problems existing in the detection of the traditional hydraulic system, such as the large volume of sensor and the low measurement accuracy, a new one-piece target type flow sensor is designed and researched based on fiber Bragg grating (FBG). A compact structure is designed, which is convenient to be dismantled, processed, and installed, based on the analysis of the principle of FBG and the structure of target type flow sensor. The force of target put in fluid flow is turned into the FBG wavelength drift, with a corresponding relationship. The problem on the cross sensitivities of the temperature and strain is solved effectively by using double FBG symmetrically pasted on the both surfaces of the cantilever. The impact on the fluid state is analyzed through simulation in the software FLUENT, and the results show that the impact was smaller than that of the traditional structure. The results of experiments in the hydraulic system show that there is a good linear relationship between the change in the dual FBG central wavelength and mass loading on the target sheet has a good linear relationship, and the sensitivity is twice that of a single FBG sensitivity.

  12. Microencapsulation of menhaden fish oil containing soluble rice bran fiber using spray drying technology.

    Science.gov (United States)

    Wan, Yuting; Bankston, Joseph David; Bechtel, Peter J; Sathivel, Subramaniam

    2011-05-01

    Emulsion (EFMO) containing purified menhaden oil (PMO) and soluble rice bran fiber (SRBF) was dried in a pilot scale spray dryer and produced microencapsulated PMO with SRBF (MFMO). EFMO had well isolated spherical droplets with the size of 1 to 10 μm and showed pseudoplastic fluid and viscoelastic characteristics. EFMO had lower lipid oxidation than the emulsion containing PMO without SRBF when both emulsions were stored at 20 and 40 °C for 88 h, which indicated that the SRBF reduced the lipid oxidation in the EFMO. The estimated MFMO production rate (3.45 × 10(-5) kg dry solids/s) was higher than the actual production rate (2.31 × 10(-5) kg dry solids/s). The energy required to spray dry the EFMO was 12232 kJ/kg of emulsion. EPA and DHA contents of MFMO were 11.52% and 4.51%, respectively. The particle size of 90% MFMO ranged from 8 to 62 μm, and the volume-length diameter of MFMO was 28.5 μm.

  13. 陶瓷纤维炉衬表面防护技术%Surface Protection Technology for Ceramic Fiber Furnace Lining

    Institute of Scientific and Technical Information of China (English)

    侯世英

    2013-01-01

    通过分析陶瓷纤维制品作为工业炉炉衬的优缺点,综述了常用的陶瓷纤维表面防护技术的几种应用形式及其优缺点,同时提出了优化设计的一些建议.%Through analyzing the merits and demerits of ceramic fiber products for industry furnace lining, some application forms and their advantages and disadvantages of the commonly used ceramic fiber surface protection technology were summarized, and some suggestions of optimization design were given out.

  14. High-throughput and low-latency 60GHz small-cell network architectures over radio-over-fiber technologies

    Science.gov (United States)

    Pleros, N.; Kalfas, G.; Mitsolidou, C.; Vagionas, C.; Tsiokos, D.; Miliou, A.

    2017-01-01

    Future broadband access networks in the 5G framework will need to be bilateral, exploiting both optical and wireless technologies. This paper deals with new approaches and synergies on radio-over-fiber (RoF) technologies and how those can be leveraged to seamlessly converge wireless technology for agility and mobility with passive optical networks (PON)-based backhauling. The proposed convergence paradigm is based upon a holistic network architecture mixing mm-wave wireless access with photonic integration, dynamic capacity allocation and network coding schemes to enable high bandwidth and low-latency fixed and 60GHz wireless personal area communications for gigabit rate per user, proposing and deploying on top a Medium-Transparent MAC (MT-MAC) protocol as a low-latency bandwidth allocation mechanism. We have evaluated alternative network topologies between the central office (CO) and the access point module (APM) for data rates up to 2.5 Gb/s and SC frequencies up to 60 GHz. Optical network coding is demonstrated for SCM-based signaling to enhance bandwidth utilization and facilitate optical-wireless convergence in 5G applications, reporting medium-transparent network coding directly at the physical layer between end-users communicating over a RoF infrastructure. Towards equipping the physical layer with the appropriate agility to support MT-MAC protocols, a monolithic InP-based Remote Antenna Unit optoelectronic PIC interface is shown that ensures control over the optical resource allocation assisting at the same time broadband wireless service. Finally, the MT-MAC protocol is analysed and simulation and analytical theoretical results are presented that are found to be in good agreement confirming latency values lower than 1msec for small- to mid-load conditions.

  15. Optical fibers installation the different technologies and the advantages of using the RTE power grid; Pose de fibres optiques les differentes technologies et les avantages lies a l'utilisation du reseau de transport d'electricite de RTE

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-07-01

    To install optical fibers lines RTE implements two different technologies: the THYM line and the COE line. The two technologies are explained and compared with the advantages of using RTE for such an equipment. (A.L.B.)

  16. Status on Technology Development of Optic Fiber-Coupled Laser Ignition System for Rocket Engine Applications

    Science.gov (United States)

    Trinh, Huu P.; Early, Jim; Osborne, Robin; Thomas, Matthew; Bossard, John

    2003-01-01

    To pursue technology developments for future launch vehicles, NASA/Marshall Space Flight Center (MSFC) is examining vortex chamber concepts for liquid rocket engine applications. Past studies indicated that the vortex chamber schemes potentially have a number of advantages over conventional chamber methods. Due to the nature of the vortex flow, relatively cooler propellant streams tend to flow along the chamber wall. Hence, the thruster chamber can be operated without the need of any cooling techniques. This vortex flow also creates strong turbulence, which promotes the propellant mixing process. Consequently, the subject chamber concept: not only offer system simplicity, but also enhance the combustion performance. Test results have shown that chamber performance is markedly high even at a low chamber length-to-diameter ratio. This incentive can be translated to a convenience in the thrust chamber packaging.

  17. 纳米碳纤维技术的新进展%New development of carbon nano-fibers technology

    Institute of Scientific and Technical Information of China (English)

    芦长椿

    2013-01-01

    综述了已投入商业化运营的纳米碳纤维(CNF)生产工艺,诸如化学汽相沉积法(CVD)、静电纺丝法技术状况以及相关的生命周期分析数据.表明纳米尺度的碳纤维及其复合材料是一种多功能材料,具有优良的导电性、力学增强性和热性能.在纳米复合材料、贮氢和催化载体领域显示出了市场潜力.%The article introduces CNF manufacture process which is commercially used,for instance,chemical vapor deposition (CVD) and electro-spinning technology as well as their life cycle assessment (LCA).Nanometer scale carbon fiber (CNF) and its composites is a multi-functional material with the excellent electrical conductivity,mechanical reinforcement and thermal properties.It demonstrates marketing potentiality in aspects of CNF composites,hydrogen storage and catalyst supports.

  18. Enabling technologies for millimeter-wave radio-over-fiber systems in next generation heterogeneous mobile access networks

    Science.gov (United States)

    Zhang, Junwen; Yu, Jianjun; Wang, Jing; Xu, Mu; Cheng, Lin; Lu, Feng; Shen, Shuyi; Yan, Yan; Cho, Hyunwoo; Guidotti, Daniel; Chang, Gee-kung

    2017-01-01

    Fifth-generation (5G) wireless access network promises to support higher access data rate with more than 1,000 times capacity with respect to current long-term evolution (LTE) systems. New radio-access-technologies (RATs) based on higher carrier frequencies to millimeter-wave (MMW) radio-over-fiber, and carrier-aggregation (CA) using multi-band resources are intensively studied to support the high data rate access and effectively use of frequency resources in heterogeneous mobile network (Het-Net). In this paper, we investigate several enabling technologies for MMW RoF systems in 5G Het-Net. Efficient mobile fronthaul (MFH) solutions for 5G centralized radio access network (C-RAN) and beyond are proposed, analyzed and experimentally demonstrated based on the analog scheme. Digital predistortion based on memory polynomial for analog MFH linearization are presented with improved EVM performances and receiver sensitivity. We also propose and experimentally demonstrate a novel inter-/intra- RAT CA scheme for 5G Het- Net. The real-time standard 4G-LTE signal is carrier-aggregated with three broadband 60GHz MMW signals based on proposed optical-domain band-mapping method. RATs based on new waveforms have also been studied here to achieve higher spectral-efficiency (SE) in asynchronous environments. Full-duplex asynchronous quasi-gapless carrier aggregation scheme for MMW ROF inter-/intra-RAT based on the FBMC is also presented with 4G-LTE signals. Compared with OFDM-based signals with large guard-bands, FBMC achieves higher spectral-efficiency with better EVM performance at less received power and smaller guard-bands.

  19. Coffee dietary fiber contents and structural characteristics as influenced by coffee type and technological and brewing procedures.

    Science.gov (United States)

    Gniechwitz, Diana; Brueckel, Birgit; Reichardt, Nicole; Blaut, Michael; Steinhart, Hans; Bunzel, Mirko

    2007-12-26

    Coffee brews contain considerable amounts of soluble dietary fiber, mainly low substituted galactomannans and type II arabinogalactans. Factors possibly influencing the content and structures of dietary fiber in coffee brews, such as type of coffee, roasting and grinding degree, and brewing procedure, were studied. In addition, several commercial samples such as instant espresso, instant coffee, instant cappuccino, decaffeinated coffees, and coffee pads were analyzed. The dietary fiber contents of the coffee brews ranged from 0.14 to 0.65 g/100 mL (enzymatic-gravimetric methodology), proving an influence of the factors investigated. For example, the drip brew of an arabica coffee contained significantly more soluble dietary fiber than the drip brew of a comparable robusta coffee, and depending on the brewing procedure, the soluble dietary fiber content of beverages obtained from the same coffee sample ranged from 0.26 to 0.38 g/100 mL. Dietary fiber contents of coffee brews were enhanced only up to a certain degree of roast. Drip brews of decaffeinated arabica coffees (commercial samples) contained significantly less dietary fiber than any non-decaffeinated drip brew investigated in this study. The observed differences in the dietary fiber contents were accompanied by changes in the structural characteristics of fiber polysaccharides, such as galactomannan/arabinogalactan ratio, galactose substitution degree of mannans, or galactose/arabinose ratio of arabinogalactans as analyzed by methylation analysis.

  20. Investigations on injection molded, glass-fiber reinforced polyamide 6 integral foams using breathing mold technology

    Science.gov (United States)

    Roch, A.; Kehret, L.; Huber, T.; Henning, F.; Elsner, P.

    2015-05-01

    Investigations on PA6-GF50 integral foams have been carried out using different material systems: longfiber- and shortfiber-reinforced PA6 as well as unreinforced PA6 as a reference material. Both chemical and physical blowing agents were applied. Breathing mold technology (decompression of the mold) was selected for the foaming process. The integral foam design, which can be conceived as a sandwich structure, helps to save material in the neutral axis area and maintains a distance between load-bearing, unfoamed skin layers. For all test series an initial mold gap of 2.5 mm was chosen and the same amount of material was injected. In order to realize different density reductions, the mold opening stroke was varied. The experiments showed that, at a constant mass per unit area, integral polyamide 6 foams have a significantly higher bending stiffness than compact components, due to their higher area moment of inertia after foaming. At a constant surface weight the bending stiffness in these experiments could be increased by up to 600 %. Both shortfiber- and longfiber-reinforced polyamide 6 showed an increase in energy absorption during foaming.

  1. Application of Modern Optical Fiber Communication Transmission Technology%现代光纤通信传输技术的应用探讨

    Institute of Scientific and Technical Information of China (English)

    李彬; 赵静娟

    2013-01-01

    Optical fiber communication, as the principal communication technology in modern telecom network, has achieved rapid development and fairly good economic benefit in recent years. Along with the continuous development of communication technology, the optical fiber-leading communication transmission technology, for its large capacity, high speed and strong anti-interference capability, is widely applied in the field of communication. This paper describes the characteristics of optical fiber communication, discusses the concrete application and the future development trend of modern optical fiber communication transmission technology.%  在现代电信网中有着重要地位的光纤通信已经成为主要的通信技术,并在近几年发展速度非常快,也取得了良好的效益。随着通信技术的不断发展,以光纤为主导的通信传输技术由于其传输信息量大、速递快、抗干扰能力强等特点在通信领域得到了广泛的应用。这里介绍了光纤通信的特点,探讨了现代光纤通信传输技术的具体应用以及未来的发展趋势,随着对信息量需求的增加,光纤通信一定会取代其他的通信方式,成为信息通信领域中主流的技术。

  2. Two-Dimensional Super High Density Multi-Fiber Connector

    Institute of Scientific and Technical Information of China (English)

    Takashi Shigenaga; Katsuki Suematsu; Masao Shinoda; Takayuki Ando

    2003-01-01

    We have developed 32-fiber and 60-fiber super high density multi fiber connector. This 32-fiber connector can be applicable for single-mode fiber and 60-fiber connector for multi-mode fiber. We have also established PC (physical contact) connection technology by optimizing polishing condition and clamping force.

  3. Reinforcing Wooden Composite with Glass Fiber Fabric - Manufacturing Technology as a Factor Limiting Mechanical Properties and Reliability

    Directory of Open Access Journals (Sweden)

    Deskiewicz Adam

    2016-07-01

    Full Text Available This paper investigates the strength and reliability of the wooden composites reinforced with glass fiber for the skateboard application. Three different methods of glass-fiber reinforcement have been used to prepare totally 94 samples, including control trial. Two lamination methods have been utilized: vacuum and HPL (High Pressure Lamination. Conducted analysis allowed to determine preferred production technique.

  4. Successful field application in continuous DTS monitoring under harsh environment of SAGD wells using improved optical fiber technology

    Energy Technology Data Exchange (ETDEWEB)

    Kaura, J.; Sierra, J. [Halliburton Energy Services, Calgary, AB (Canada). WellDynamics

    2008-10-15

    Most protective materials of conventional optical fibers used in well monitoring applications are not designed for the extreme temperatures associated with steam assisted gravity drainage (SAGD) operations. Optical fiber performance is highly affected by hydrogen ingression; thermal resistance of materials; and mechanical resistance of the fiber. Optical fibers exposed to hydrogen experience increased absorption or light loss due to various chemical species in the glass fiber. This paper described the performance of a newly developed distributed temperature sensing (DTS) high temperature (HT) system for use in a hydrogen-rich SAGD environment. The OptoLog uses a new single-mode fiber that is hydrogen resilient under severe temperature. Hydrogen molecular reactions with impurities from the manufacturing process are minimized by a pure core glass fiber. The new temperature calculation algorithm used by the system was also described in this paper along with a comparative evaluation of the system performance with that of a conventional multi-mode DTS system. It was concluded that this newly developed system is a feasible solution for lowering Opex and minimizing interventions. It also reduces personnel exposure to hazardous well conditions because of the enhanced longevity of the OptoLog DTS-HT fiber. The data provided by the new system enables users to quickly identify anomalies; implement corrective actions immediately; and allow for better steam utilization. 24 refs., 6 figs.

  5. Nonlinear Photonic Crystal Fibers

    DEFF Research Database (Denmark)

    Hansen, Kim Per

    2004-01-01

    Despite the general recession in the global economy and the collapse of the optical telecommunication market, research within specialty fibers is thriving. This is, more than anything else, due to the technology transition from standard all-glass fibers to photonic crystal fibers, which, instead...... of doping, use a microstructure of air and glass to obtain a refractive index difference between the core and the cladding. This air/glass microstructure lends the photonic crystal fibers a range of unique and highly usable properties, which are very different from those found in solid standard fibers....... The freedom to design the dispersion profile of the fibers is much larger and it is possible to create fibers, which support only a single spatial mode, regardless of wavelength. In comparison, the standard dispersion-shifted fibers are limited by a much lower index-contrast between the core and the cladding...

  6. Fiber MOPA for Ascends Project

    Data.gov (United States)

    National Aeronautics and Space Administration — CO2 sensing using absorption bands near 1570nm is very attractive by taking advantage of the mature fiber-amplifier technology derived from fiber-optic telecom...

  7. 光纤通信系统保密技术研究%Research on the Security Technology of Optical Fiber Communication System

    Institute of Scientific and Technical Information of China (English)

    吉文龙

    2011-01-01

    For the wide transmission band and good secrecy performance, Optical fiber communication is one of the world's most promising communication technologies. In this thesis, the chaotic secure communication, optical code division multiple access security technology and quantum secure communication technology are discussed, and the three kinds of security technology principle and technical features are described in detail.%光纤通信传输频带宽,保密性能好,是当今世界上最有发展前途的通信技术。本论文就混沌保密通信技术、光纤码分多址保密技术和量子保密通信技术进行了讨论,并详细阐述了该三种保密技术的原理、技术特点等。

  8. 非木材纤维原料制浆技术研究进展%Study on Pulping Technology of Non-wood Fiber Materials

    Institute of Scientific and Technical Information of China (English)

    黄国林; 张成芳; 方耀

    2001-01-01

    On the base of discussing the composition,characteristic of non-wood fiber materials,the progress of non-wood fiber materials pulping technology including improvement of alkaline、sulphite、solvent and biopretreatment at home and abroad was reviewed.%本文在论述了非木材植物纤维的组成、特点的基础上,综述了近年来国内外非木材纤维原料制浆技术,包括传统碱法的改进、亚硫酸盐法的改进以及溶剂法和生物法的研究进展。

  9. Fiber Lasers V

    DEFF Research Database (Denmark)

    Hansen, Kim P.; Olausson, Christina Bjarnal Thulin; Broeng, Jes

    2008-01-01

    High-power fiber lasers and amplifiers have gained tremendous momentum in the last five years, and many of the traditional manufactures of gas and solid-state lasers are pursuing the attractive fiber-based systems, which are now displacing the old technology in many areas. High-power fiber laser...... laser system. We present the latest advancements within airclad fiber technology including a new 70 μm single-mode polarization-maintaining rod-type fiber capable of amplifying to MW power levels. Furthermore we describe the novel airclad based pump combiners and their use in a completely monolithic 350...... W CW fiber laser system with an M2 of less than 1.1. Finally, we briefly touch upon the subject of photo darkening and its origin....

  10. Raman fiber lasers

    Science.gov (United States)

    Supradeepa, V. R.; Feng, Yan; Nicholson, Jeffrey W.

    2017-02-01

    High-power fiber lasers have seen tremendous development in the last decade, with output powers exceeding multiple kilowatts from a single fiber. Ytterbium has been at the forefront as the primary rare-earth-doped gain medium owing to its inherent material advantages. However, for this reason, the lasers are largely confined to the narrow emission wavelength region of ytterbium. Power scaling at other wavelength regions has lagged significantly, and a large number of applications rely upon the diversity of emission wavelengths. Currently, Raman fiber lasers are the only known wavelength agile, scalable, high-power fiber laser technology that can span the wavelength spectrum. In this review, we address the technology of Raman fiber lasers, specifically focused on the most recent developments. We will also discuss several applications of Raman fiber lasers in laser pumping, frequency conversion, optical communications and biology.

  11. 大豆膳食纤维挂面的工艺研究%Processing technology of soybean dietary fiber vermicelli

    Institute of Scientific and Technical Information of China (English)

    张娟; 蔺佳慧; 杨昉明

    2012-01-01

    为了研究大豆膳食纤维挂面的加工工艺,以面粉、大豆渣为主要原料,通过单因素和正交试验,考察了4个因素对大豆膳食纤维挂面品质特性的影响,确定了其最佳的工艺参数。最终试验结果表明,影响大豆膳食纤维挂面加工工艺的因素影响程度由大到小依次为:大豆渣〉加水量〉海藻酸钠〉食盐;最佳的工艺参数为大豆渣10%、加水量35%、海藻酸钠0.6%、食盐3%。在此条件下制得的大豆膳食纤维挂面复水快、耐煮、口感好、品质佳。%In order to study the soybean dietary fiber vermicelli processing technology, to flour, the main raw material for soybean residue, through the single factor and orthogonat tests, examined the four factors on the quality and characteristics of soybean dietary fiber of vermicelli, to determine its optimum process parameters. Final test results show that the influencing factors of soybean dietary fiber vermicelli processing technology descending order of impact: soybean residue〉water〉sodium alginate〉salt; the best process parameters for the 10 percent of soybean residue, 35 percent of water, 0.6 percent of sodium alginate, 3 percent of salt. The soybean dietary fiber vermicelli rehydrate which the system results under this condition quick, bears boils, the feeling in the mouth to be good, the quality is suitable.

  12. 香蕉假茎纤维造纸技术的研究%Study on Paper Making Technology of Banana Stem Fiber

    Institute of Scientific and Technical Information of China (English)

    陈致水; 李粤; 梁栋; 王娟

    2011-01-01

    [Objective] The aim was to study paper making technology of banana stem fiber. [ Method] The paper quality, paper output, cost and investment on raw material base were analyzed. [ Result ] Paper produced by banana stem fiber was durable without acid substance, the toughness is 30 times more than common paper. Compared with other plant fibers, paper making technology by banana stem fiber has its own advantages at cost, environment etc. [Conclusion] With banana stem as paper making material has profound development value and application prospect.%[目的]对香蕉假茎纤维造纸技术进行研究.[方法]分别对纸质、出纸率、成本、原料基地投资进行分析.[结果]从香蕉假茎中提取的纤维制成的纸张不含酸性物质,很耐用,韧度是一般纸张的30倍,能防火、吸油却不透水;与其他植物纤维相比,香蕉假茎纤维虽然纤维素含量中等,但综合成本、环境各方面的因素,香蕉假茎纤维造纸技术具有一定优势.[结论]香蕉假茎作为造纸原料,具有很大的开发价值和应用前景.

  13. Optical Fiber Devices in WDM Networks

    Institute of Scientific and Technical Information of China (English)

    Shan Jiang; Yong Luo; Xinda Yin; Wei Shi; Qianggao Hu

    2003-01-01

    Crystal optics and fiber grating technology are two of the most important optical fiber device technologies.In this paper, we report several new devices developed in Accelink for WDM networks application.

  14. Optical Fiber Devices in WDM Networks

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    Crystal optics and fiber grating technology are two of the most important optical fiber device technologies. In this paper, we report several new devices developed in Accelink for WDM networks application.

  15. 新溶剂法纤维素纤维的技术进展%Technological Progress of New Solvent Process Regenerated Cellulose Fibers

    Institute of Scientific and Technical Information of China (English)

    骆强; 陈功林; 徐纪刚; 李方全; 孙玉山

    2011-01-01

    传统的粘胶纤维存在源头污染问题,有必要开发符合环保和资源可再生要求的新溶剂法纤维素纤维生产技术,以作为未来纤维材料的大宗品种.在已开发的众多纤维素溶剂体系中,NMMO(N-甲基吗啉-N-氧化物)溶剂体系已形成了规模化生产;纤维素氨基甲酸酯、氢氧化钠或氢氧化锂/硫脲或锌酸钠或(和)尿素水溶液、离子液体溶剂体系的开发也取得了较大进展.以NMMO为代表的有机溶剂法纤维素纤维产业化工程技术中,连续真空薄膜推进溶解技术具有对比优势;纺丝技术均为干喷湿纺;溶剂回收技术的发展方向是提浓过程的高效蒸发并结合其它节能技术;原纤化控制技术在规模化生产中采用干燥前在线交联.%There are headstream pollution problems for the traditional viscose fiber production process, so it is necessary to develop the new solvent process for regenerated cellulose fiber, to be as a staple variety of future fiber materials. In the multitudinous developed solvent systems for cellulose,the solvent system of NMMO (N-methylmorpholine-N-oxide) has been applied into large scale industrial production; the developments of cellulose carbamate, sodium hydroxide or lithium hydroxide/thiourea or sodium zincate or (and) urea/water solution, ionic liquid systems have also made remarkable progresses. In the industrialization technologies of organic solvent process of regenerated cellulose fibers represented by NMMO process, the continuous dissolving technology of film evaporation pushed forward in vacuum has comparison advantages; for spinning methord it is all the dry-jet wet-spinning; the development direction for solvent recovery technology is high efficiency evaporation combined with other energy saving technologies in concentration process; the on-line crosslinking technologies before drying are adopted in large scale productions for the control of fibrillation.

  16. PTFE纤维制备技术的研究进展%Research progress in PTFE fiber manufacturing technology

    Institute of Scientific and Technical Information of China (English)

    张天; 胡祖明; 于俊荣; 陈蕾; 诸静; 王亓超

    2012-01-01

    介绍了聚四氟乙烯(PTFE)纤维的结构和物理化学性能;详述了PTFE纤维制备技术,如载体纺丝(湿法纺丝、干法纺丝)、糊料挤出纺丝、熔体纺丝、切割膜裂法等纺丝工艺,比较了各种纺丝工艺的优缺点,载体纺丝法制备PTFE纤维技术较为成熟,可制备线密度较小的纤维;叙述了PTFE纤维在过滤材料、医学材料、密封填料和纺织工业等方面的应用;指出我国PTFE纤维发展的关键是改进及开发新的制备技术,提高PTFE纤维的质量及产量.%The structure and physical and chemical properties of polytetrafluoroethylene (PTFE) fiber were introduced. Hie manufacturing techniques for PTFE fiber were described in details, including carrier spinning (wet spinning and dry spinning), paste extrusion spinning, melt spinning, fissure spinning. The advantages and disadvantages of these spinning techniques were compared. Carrier spinning process was a mature technique for PTFE fiber,especially for low-linear density fiber. The application of PTFE fiber was described in the fields of filtration material, medical material, sealing packing and textile industry. It was pointed out that the key to China PTFE fiber development should be the innovation and development of novel manufacturing techniques and the improvement of PTFE fiber quality and output.

  17. 国产碳纤维织物织造工艺技术探讨%Discuss on domestic carbon fiber fabric weaving technology

    Institute of Scientific and Technical Information of China (English)

    杨建恒; 侯建荣; 韩笑

    2012-01-01

    On the basis of summing up the production practices of domestic rigid telescopic shaft loom weaving, through the 3k carbon fiber woven fabric of designing, weaving technology, process and operation, such problems were analyzed and studied, it has achieved good results. The results show that the use of filament winding tension of 2N, speed of 30meters/min fixed-length bobbin unwinding; carbon fiber warp tows with a single beam of warp tension for 5N radial unwinding, weaving at a rate of 80 r/min, can get the apparent quality and performances are better than 3k carbon fiber fabric.%在总结刚性伸缩剑杆织布机织造生产实践的基础上,对国产3k碳纤维平纹布的设计计算、工艺流程、织造工艺等问题进行了分析和研究。结果表明:采用碳纤维丝束缠绕张力2 N和速度30 m/min的定长络筒退绕;碳纤维经纱采用单束经纱张力为5 N的径向退绕,织布速度在80 r/min时,可以得到表观质量和性能均有较大提高的3k碳纤维平纹布。

  18. Effects of interaction of phosphorus,potassium fertilizer and paclobutrazol(PP333)on nutrients absorption and cell membrance permeabity of Zoysiagrass matralla%磷、钾肥与多效唑互作对沟叶结缕草养分吸收和细胞质膜透性的影响

    Institute of Scientific and Technical Information of China (English)

    周红艳; 林文雄

    2014-01-01

    试验采用裂裂区设计,研究了磷、钾肥与多效唑互作对沟叶结缕草养分吸收和细胞质膜透性的影响。结果表明,磷、钾肥、多效唑间存在正互作效应。合理配施能显著促进沟叶结缕草 N、P、K 养分物质积累,为沟叶结缕草越冬奠定物质基础,同时诱导质膜透性降低。综合分析试验最优组合为 P2 O560 kg/hm2、KCl 140 kg/hm2、多效唑250 mg/L。%In order to solve the problem of degradation of zoysiagrass matralla in winter of Fuj ian Province and subtropical area.The study on the effects of interaction of phosphorus,potassium fertilizer and pa-clobutrazol(PP333)on nutrients absorption and cell membrance permeabity of Zoysiagrass matralla was done using a split-split-block field design.The results showed there was positive interaction between phosphorus,po-tassium fertilizer and paclobutrazol.The comnined application of phosphorus,potassium fertilizer and pa-clobutrazol could significantly improved the nutrients(nitrogen phosphorus and potassium)absorbtion of Zoy-siagrass matralla ,which had established nutrient base for zoysiagrass in winter season,and coupling with the decrease of cell membrance permeabity.The optimum combination of phosphorus,potassium and paclobutrazol (PP333)was proposecd based on comprehensive analysis under the condition of this test,which was P2 O5 :60 kg/hm2 +K2 O:140 kg/hm2 +paclobutrazol(PP333):250 mg/L.

  19. Fiber-top micromachined devices

    NARCIS (Netherlands)

    Iannuzzi, D.; De Man, S.; Alberts, C.J.; Berenschot, Johan W.; Elwenspoek, Michael Curt; Said, A.A.; Dugan, M.

    2008-01-01

    After a general review on fiber-top technology, we will present our recent achievements in the utilization of fiber-top double-clamped cantilevers as refractometers and in the development of alternative techniques for the fabrication of fiber-top devices.

  20. Mine operating accurate stability control with optical fiber sensing and Bragg grating technology: the BRITE-EURAM STABILOS project

    Science.gov (United States)

    Ferdinand, Pierre; Ferragu, Olivier; Lechien, J. L.; Lescop, B.; Marty-DeWinter, Veronique; Rougeault, S.; Pierre, Guillaume; Renouf, C.; Jarret, Bertrand; Kotrotsios, Georges; Neuman, Victor; Depeursinge, Y.; Michel, J. B.; Van Uffelen, M.; Verbandt, Yves; Voet, Marc R. H.; Toscano, D.

    1994-09-01

    Recent developments of stability control in mines, essentially based on Ge-doped Fiber Bragg Gratings (FBG) are reported including results about the different aspects of the system: accurate characterizations of FBG, sensor network topology and multiplexing method, user interface design and sensor packaging.

  1. Scaling of Fiber Laser Systems Based on Novel Components and High Power Capable Packaging and Joining Technologies

    Science.gov (United States)

    2010-09-01

    l ri Laser Splicing/ Welding r li i / l i Contact Bonding t t i Wafer Level Bonding Mineralic, Fusion. Anodic, Eutectic, Glass-frit, liquid...diode Bonding and Packaging of Optical Components Solder Bumping Thickfilm Au Metallization Laser diode Fiber Assembly element Asphere Ceramic System

  2. 聚酰亚胺纤维及其纺丝工艺研究进展%Research Progress of Polyimide Fiber and its Spinning Technology

    Institute of Scientific and Technical Information of China (English)

    向红兵; 陈蕾; 胡祖明

    2011-01-01

    Polyimide fiber has become one of the hot topics in the fieldof hi-tech fibers for its good property. Polymer monomer including dianhydrides (PMDA、 BPDA、 ODPA、 BTDA, etc), diamines (ODA、PPD、MPD,etc) and the third monomers(PRM、Cl-PPD、ODA etc) were reviewed in this article. The main spinning technology of polyimide fibers(such as dry spinning, wet spinning, dry-wet spinning, electro-spinning, melt- spinning and liquid crystal spinning) and its research progress were summarized. Meanwhile,major problems of polyimide fibers research at present were discussed.%聚酰亚胺纤维由于其优良的性能,已成为高技术纤维领域的研究热点之一.本文归纳了聚酰亚胺纤维的聚合单体,主要有二酐单体(均苯四甲酸酐、联苯四甲酸酐、二苯醚四酸二酐、二苯酮四酸二酐等)和二胺单体(二氨基二苯醚、对苯二胺、间苯二胺等).另外,还有第三单体,如嘧啶环二胺、氯化对苯二胺、二氨基二苯醚等,综述了聚酰亚胺纤维的主要纺丝工艺(如干法纺丝、湿法纺丝、干湿法纺丝、静电纺丝、熔融纺丝、液晶纺丝)及其研究进展,并提出了目前聚酰亚胺纤维研发中存在的主要问题.

  3. Situation of optical fiber communication technology and development trends%试论光纤通信技术的现状及发展趋势

    Institute of Scientific and Technical Information of China (English)

    闫玉霞

    2014-01-01

    随着现代科学技术的发展,吸波材料被广泛的应用于人体安全防护、微波暗室、通讯以及导航系统的电磁干扰、安全信息保密、电磁兼容、核反应堆防辐射等多方面。文章对光纤通信技术的现状及发展趋势进行了详细分析。%along with the development of modern science and technology, absorbing material is widely used in human security, microwave anechoic chamber, communication and navigation systems, electromagnetic interference,the security of information, electromagnetic compatibility, radiation protection and other aspects of nuclear reactor. In this paper, the present situation and development trend of optical fiber communication technology is analyzed in detail.

  4. Metropolitian area network services comprised of virtual local area networks running over hybrid fiber-coax and asynchronous transfer mode technologies

    Science.gov (United States)

    Biedron, William S.

    1995-11-01

    Since 1990 there has been a rapid increase in the demand for communication services, especially local and wide area network (LAN/WAN) oriented services. With the introduction of the DFB laser transmitter, hybrid-fiber-coax (HFC) cable plant designs, ATM transport technologies and rf modems, new LAN/WAN services can now be defined and marketed to residential and business customers over existing cable TV systems. The term metropolitan area network (MAN) can be used to describe this overall network. This paper discusses the technical components needed to provision these services as well as provides some perspectives on integration issues. Architecture at the headend and in the backbone is discussed, as well as specific service definitions and the technology issues associated with each. The TCP/IP protocol is suggested as a primary protocol to be used throughout the MAN.

  5. 紫红薯膳食纤维漂白工艺研究%Studies on the Bleaching Technology of Purple Ipomoea batatas Dietary Fiber

    Institute of Scientific and Technical Information of China (English)

    吴少福; 蒋艳; 上官新晨; 沈勇根; 徐嘉琪; 罗娟

    2011-01-01

    为了得到色泽较浅的紫红薯膳食纤维,以样品的白度为指标,采用单因素和正交优化试验对H2O2漂白紫红薯膳食纤维的工艺进行研究.结果表明:将紫红薯膳食纤维用40 g/L H2O2溶液按1:15调成浆,pH值调整为10.0,在60 ℃的水浴中保温处理180 min,样品的白度值达到85.39%.%In order to obtain lighter -color purple lpomoea batatas dietary fiber, taking whiteness of the sample as an indicator, the bleaching technology of the purple lpomoea batatas dietary fibers was researched by H202 method. The optimum technologic parameters of the purple Ipomoea batatas IDF bleaching was obtained with single -factor and orthogonal experiment. The results showed that: 1:15 proportion of purple lpomoea batatas IDF to H2O2 solution, the concentration of hydrogen peroxide was 40 g/L, pH 10, temperature 60 ℃, time 180 min. Its brightness reached 85.39%.

  6. A New Adsorbent Composite Material Based on Metal Fiber Technology and Its Application in Adsorption Heat Exchangers

    Directory of Open Access Journals (Sweden)

    Ursula Wittstadt

    2015-08-01

    Full Text Available In order to achieve process intensification for adsorption chillers and heat pumps, a new composite material was developed based on sintered aluminum fibers from a melt-extraction process and a dense layer of silico-aluminophosphate (SAPO-34 on the fiber surfaces. The SAPO-34 layer was obtained through a partial support transformation (PST process. Preparation of a composite sample is described and its characteristic pore size distribution and heat conductivity are presented. Water adsorption data obtained under conditions of a large pressure jump are given. In the next step, preparation of the composite was scaled up to larger samples which were fixed on a small adsorption heat exchanger. Adsorption measurements on this heat exchanger element that confirm the achieved process intensification are presented. The specific cooling power for the adsorption step per volume of composite is found to exceed 500 kW/m3 under specified conditions.

  7. Fiber diffraction without fibers.

    Science.gov (United States)

    Poon, H-C; Schwander, P; Uddin, M; Saldin, D K

    2013-06-28

    Postprocessing of diffraction patterns of completely randomly oriented helical particles, as measured, for example, in so-called "diffract-and-destroy" experiments with an x-ray free electron laser can yield "fiber diffraction" patterns expected of fibrous bundles of the particles. This will allow "single-axis alignment" to be performed computationally, thus obviating the need to do this by experimental means such as forming fibers and laser or flow alignment. The structure of such particles may then be found by either iterative phasing methods or standard methods of fiber diffraction.

  8. Study on the Wet Spinning Technologies of PAN Precursor Fiber Made by DMSO Method%DMSO法PAN原丝湿法纺丝工艺研究

    Institute of Scientific and Technical Information of China (English)

    姜立军

    2011-01-01

    This paper mainly discusses the effect of PAN precursor fiber made by DMSO wet spinning technologies, coagulation, washing, stretching and drying, etc. on fiber properties. It showed that orientation of molecular in the wet spinning technologies and rate of shrinkage could be improved by increasing the spinneret aperture, the good comprehensive properties of precursor could be obtained by increasing washing bath the coagulation and temperature of concretion bath, the good properties of precursor fiber made could be gained by increasing bath temperature. At the same time, The research results also show that stretching of tow in hot water, boiling water and steam can increase the strength of properties and spinning speed, the ammonia modified silicon oil emulsion is fabourable for preparation high strength carbon fiber, and heating roller drying of the tow is advantageous to improve the homogeneity and density of precursor.%通过实验对二甲基亚砜(DMSO)法聚丙烯腈(PAN)原丝的纤维凝固成形、水洗、牵伸、干燥定型条等湿法纺丝工艺对纤维性能的影响进行了研究,实验结果表明:增大喷丝板孔径,有利于提高原丝的取向度和干燥收缩率;调节凝固浴质量分数和温度,可生产出综合性能较好的原丝;提高水洗温度有利于制得性能好的原丝;热水、沸水和蒸汽3级牵伸工艺,是提高强度和纺丝速度的重要措施;改性氮基硅油乳化物油剂有利于制备高强碳纤维;热辊干燥利于原丝的均质和致密化。

  9. Low-Loss Fiber De-Multiplexers

    Institute of Scientific and Technical Information of China (English)

    Nan-Kuang; Chen; Sien; Chi; Shiao-Min; Tseng

    2003-01-01

    Reported are fiber de-multiplexers based on side-polished fibers with a long interaction length and intra-core fiber Bragg gratings. In conjunction with the silicon processing technologies, we demonstrate fiber filters and advantages of our approaches are addressed.

  10. 电力光载无线宽带接入技术研究%Radio-on-fiber broadband access technology in power communication

    Institute of Scientific and Technical Information of China (English)

    许盛; 曾强; 易浩勇; 刘柱

    2011-01-01

    Combined with the fiber-optic communications and the wireless communication technologies ad-vantage,Rof communication is a good way to solve the problems of bandwidth flexibility security and the electromagnetic interference. With the construction of smart grid carry out, the communication demands of bandwidth, stability and reliability have been increasing, research the RoF technology,based on the EPON net-work,focusing on the system downlink transmission protocol,using the existing EPON network to get the wireless nodes together. The RoF could combine the advantages of fiber and wireless, and provide the air interface services for the end-users, meeting the needs of power communication, while reducing communication costs.The Practical application field testing of Hybrid-optical-wireless proves the feasibility of the technology's performance.%光载无线技术结合光纤通信和无线移动通信的技术优势,可以较好地解决带宽、灵活性和电磁干扰问题.随着我国智能电网建设的展开,对通信带宽、稳定性和接入可靠性的要求越来越高.研究基于电力EPON的光载无线宽带接入技术,重点是系统上下行传输协议.用现有的电力EPON网络汇聚无线节点,结合光和无线两者的优势,为终端用户提供空中接口服务,可以在满足电力通信需求的同时减少成本.通过现场实际应用测试证明了该技术的性能和可行性.

  11. 基于光纤无线融合的射频无源光网络%Converged Fiber-Wireless Radio Passive Optical Network Technologies

    Institute of Scientific and Technical Information of China (English)

    刘德明; 邓磊

    2012-01-01

    To increase the capacity of the access network and converge services, next-generation optical access network technologies are highly desirable. In this paper, we propose converged fiber-wireless radio passive optical (RPON) architecture. This incorporates the low-cost and easy-control of PON and the high flexibility, good mobility of radio over fiber. With millimeter-wave optical generator and wavelength division multiplexing, our RPON system is capable of transmitting 1 Gbit/s wireless signals over 10 km single mode fiber and 5 m air distance in both the upstream and downstream. Our proposed system can be applied at low cost.%文章认为为了实现更大的光接入网容量,并能更好地完成多业务的承载与融合,亟待发展下一代光接入网技术.文章提出了基于光纤无线融合的射频无源光网络(RPON),其不仅具有现有无源光网络系统低成本和易管控的特点,还具备光载射频系统灵活度高和移动性好的优势.该系统通过光生毫米波和波分复用的方式,实现了1 Gb/s多媒体业务的单纤上下行传输,达到了10 km光纤和5m无线的接入距离,能够满足低成本化推广应用要求.

  12. Development and Station of Fiber Optical Communication Technology Characteristics%光纤通信技术发展特点及现状

    Institute of Scientific and Technical Information of China (English)

    王锐

    2011-01-01

    Optical fiber communication is its transmission frequency bandwldtla, communlcauon capacity, long distance relay, low loss characteristics, and with anti-electromagnetic interference capability, security and good benefits, the trunk lines in the communications, power control systems and military communications field the use of more and more widely. Optical fiber communication technology is moving in large capacity, ultra-long haul transmission and switching, the direction of all-optical networks.%光纤通信是以其传输频带宽、通信容量大、中继距离长、损耗低特点,并具有抗电磁干扰能力强,保密性好的优势,在通信的主干线路中、电力通信控制系统中以及军事领域的用途越来越广泛。光纤通信技术正朝着超大容量、超长距离传输和交换、全光网络方向发展。

  13. 大面积钢纤维混凝土地坪裂缝控制技术%Large Steel Fiber Reinforced Concrete Floor Crack Control Technology

    Institute of Scientific and Technical Information of China (English)

    颜丙波

    2015-01-01

    钢纤维混凝土是一种性能优良的新型建筑材料,它能显著提高混凝土的抗拉、抗剪、抗折强度等多项性能。本文以某工程为例,对钢纤维混凝土地坪不同原因产生的裂缝进行了统计,并提出了针对性的施工控制技术,实践证明效果良好,可为同类工程设计提供参考。%Steel fiber reinforced concrete is a kind of new building materials with excellent properties; it can significantly improve the concrete tensile, shear and flexural strength per-formance. Taking a project as an example, the steel fiber rein-forced concrete floor cracks of different causes, and put forward the corresponding construction control technology, the practice shows that good effect can provide a reference for similar engi-neering design.

  14. Automatic on-line detection system design research on internal defects of metal materials based on optical fiber F-P sensing technology

    Science.gov (United States)

    Xia, Liu; Shan, Ning; Chao, Ban; Caoshan, Wang

    2016-10-01

    Metal materials have been used in aerospace and other industrial fields widely because of its excellent characteristics, so its internal defects detection is very important. Ultrasound technology is used widely in the fields of nondestructive detection because of its excellent characteristic. But the conventional detection instrument for ultrasound, which has shortcomings such as low intelligent level and long development cycles, limits its development. In this paper, the theory of ultrasound detection is analyzed. A computational method of the defects distributional position is given. The non-contact type optical fiber F-P interference cavity structure is designed and the length of origin cavity is given. The real-time on-line ultrasound detecting experiment devices for internal defects of metal materials is established based on the optical fiber F-P sensing system. The virtual instrument of automation ultrasound detection internal defects is developed based on LabVIEW software and the experimental study is carried out. The results show that this system can be used in internal defect real-time on-line locating of engineering structures effectively. This system has higher measurement precision. Relative error is 6.7%. It can be met the requirement of engineering practice. The system is characterized by simple operation, easy realization. The software has a friendly interface, good expansibility, and high intelligent level.

  15. Preparation, characterization, and applications of a novel solid-phase microextraction fiber by sol-gel technology on the surface of stainless steel wire for determination of poly cyclic aromatic hydrocarbons in aquatic environmental samples

    Energy Technology Data Exchange (ETDEWEB)

    Es-haghi, Ali, E-mail: a.eshaghi@rvsri.ac.ir [Department of Physico Chemistry, Razi Vaccine and Serum Research Institute, PO Box 31975/148, Karaj (Iran, Islamic Republic of); Hosseininasab, Valiallah; Bagheri, Habib [Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, PO Box 11365-9516, Tehran (Iran, Islamic Republic of)

    2014-02-01

    Highlights: • A novel solid-phase microextraction (SPME) fiber was prepared using sol–gel technology. • Sol–gel coating was performed on stainless steel substrate. • The new fibers are robust and unbreakable with temperature stability. • The fibers were used for extraction of PAHs from aqueous samples. Abstract: A novel solid-phase microextraction(SPME) fiber was prepared using sol–gel technology with ethoxylated nonylphenol as a fiber coating material. The fiber was employed to develop a headspace SPME–GC–MS method suitable for quantification of 13 polycyclic aromatic hydrocarbons (PAHs) in water samples. Surface characteristics of the fibers were inspected by energy dispersive X-ray (EDX) spectroscopy as well as by scanning electron microscopy (SEM). The SEM measurements showed the presence of highly porous nano-sized particles in the coating. Important parameters affecting the extraction efficiency such as extraction temperature and time, desorption conditions as well as ionic strength have been evaluated and optimized. In the next step, the validation of the new method have been performed, finding it to be specific in the trace analysis of PAHs, with the limit of detection (LOD) ranging from 0.01 to 0.5 μg L⁻¹ and the linear range from the respective LOD to 200 μg L⁻¹with RSD amounting to less than 8%. The thermal stability of the fibers was investigated as well and they were found to be durable at 280 °C for 345 min. Furthermore, the proposed method was successfully applied for quantification of PAHs in real water samples.

  16. Optical fiber telecommunications IIIb

    CERN Document Server

    Koch, Thomas L

    2012-01-01

    Updated to include the latest information on light wave technology, Optical Fiber Telecommunication III, Volumes A & B are invaluable for scientists, students, and engineers in the modern telecommunications industry. This two-volume set includes the most current research available in optical fiber telecommunications, light wave technology, and photonics/optoelectronics. The authors cover important background concepts such as SONET, coding device technology, andWOM components as well as projecting the trends in telecommunications for the 21st century.Key Features* One of the hottest subjects of

  17. Technology of complex new type of viscous fluids/short fibers%新型粘流体/短纤维复合生产工艺

    Institute of Scientific and Technical Information of China (English)

    霍力超

    2012-01-01

    本文介绍了一种使用双螺杆聚合反应器替代传统生产装置,解决现有粘流体掺混生产周期长、真空脱气不彻底、不易放料等工艺技术难题.讨论了生产工艺对粘流体/短纤维复合产品的影响因素和产品稳定性.%The traditional device was displaced by twin screw reactor for polymerization to solve the problems of long production cycle of viscous fluids, vacuum degassing incompletely and feed hard. The effect influence and stability of technology to viscous fluids/short fibers were discussed.

  18. Application and development on radio over fiber technology%光载微波技术的应用及其发展趋势

    Institute of Scientific and Technical Information of China (English)

    张振朝

    2011-01-01

    The convergence of optical and wireless networking is a promising development for future access network architecture. In this paper, Composition, and key technic in design and implementation of the radio over fiber are mainly introduced, and its advantages and military issues can be solved is analysed in detail, The wide applications of RoF technologies for network convergence are presented in the end.%光载微波技术是未来接入网的一大发展方向.简要介绍了光载微波技术的构成、实现方式以及应用的关键技术,并详细分析了它的优势,展现了光载微波技术的广阔应用前景及发展趋势.

  19. RoF在无线接入领域的应用及发展趋势%Application and development of wireless access on radio over fiber technology

    Institute of Scientific and Technical Information of China (English)

    杨洋

    2012-01-01

    The convergence of optical and wireless networking is a promising development for fixture access network architecture. In this paper, composition, and key technic in design and implementation of the radio over fiber are mainly introduced, and its advantages and military issues can be solved is analysed in detail, The wide applications of RoF technologies for network convergence are presented in the end.%RoF技术是未来无线接入网的一大发展方向,简要介绍了RoF技术的构成、实现方式以及实用的关键技术,并详细分析了它的优势,展现了RoF技术的广阔应用前景及发展趋势.

  20. 光纤传感技术快速检验舒必利片%Rapid detection of Sulpiride Tablets by optic fiber sensing technologies

    Institute of Scientific and Technical Information of China (English)

    张春玲; 李莉; 杨婷; 冯翠娟

    2012-01-01

    目的 建立光纤传感技术对舒必利片快速定性、定量分析的方法.方法 采用光纤传感装置,将光纤探头直接插入待测样品溶液中,氘灯发出的光通过光纤传输到达探头,经探头感受溶液吸收的光信号,并再次通过光纤反馈到CCD检测器,最终通过计算机可瞬间获得待测样品的光纤紫外-可见吸收光谱,使用系统软件直接读取相关参数,实现了舒必利片的快速定性、定量分析.结果 该法测定的最大吸收波长及含量均在中国药典规定的范围内,并与药典含量测定方法进行一致性比较,结果表明2种测定方法差异无统计学意义(P>0.05).结论 光纤传感技术实现了对舒必利片快速定性和定量分析.%Objective To establish a rapid and effective method to analyze contents of Sulpiride Tablets qualitatively and quantitative ly. Methods By employing optic fiber sensing device, the probe was put directly into sample solution;and light ray emit by deuteri um lamp was led to the probe through optical fiber transmission; through probe sensing and sample solution absorption,light signal was generated and was fed back to CCD detector again through optical fiber. And finally UV Vis absorption spectrum was obtained instantaneously from sample solution through computer. Related parameters were directly read by software system so as to achieve rapid qualitative and quantitative analysis of Sulpiride Tablets. Results The maximum absorbent wavelength detected from this method and contents were proved to be within the limit proposed by Chinese Pharmacopoeia. And compared with the method pre scribed in the pharmacopoeia,the results indicated that there was no significant difference between the two methods (P>0. 05 ). Conclusion Optic fiber sensing technology achieves rapidly qualitatively and quantitatively analysis of Sulpiride Tablets.

  1. 棕榈纤维黑色素提取工艺及性质%Extraction technology and characterization of melanin from Palm fiber

    Institute of Scientific and Technical Information of China (English)

    方丽梅; 刘星星; 江颖; 王蜀; 张同华

    2016-01-01

    Mixed acid and alcohol were used to extract the palm fiber melanin,the extraction process was optimized and the basic properties of the palm fiber were studied. The one-factor-at-a-time and orthogonal array design methods were used to optimize the ex-traction technology of palm fiber melanin. The optimum extraction temperature,extraction time,ratio of solid to liquid,the volume fac-tion of alcohol and the ratio of acid and alcohol were 80 ℃,4 hours,25 g/ mL,80% and 2: 8,and the crude extract yield reached up to 34. 64% under these optimum conditions. The UV and infrared spectral characterization indicated that the melanin had a structure i-dentical to that of synthetic melanin. The palm fiber melanin was soluble in alkaline solution,but insoluble in water,acid solution and organic solvents.%采用盐酸和乙醇混合液为提取液对棕榈纤维黑色素进行提取并优化其提取工艺,对其基本性质进行了研究.结果表明,最佳提取条件为提取时间4 h、提取温度80℃、料液质量比1:25、乙醇的体积分数80%、盐酸乙醇体积比2:8,此时黑色素得率为34.64%.红外光谱图和紫外吸收光谱图表明,棕榈纤维黑色素的结构特征与合成黑色素基本一致,棕榈纤维黑色素溶于碱液但不溶于水、酸及一般的有机溶剂.

  2. Compartmental Hollow Fiber Capillary Membrane–Based Bioreactor Technology for In Vitro Studies on Red Blood Cell Lineage Direction of Hematopoietic Stem Cells

    Science.gov (United States)

    Housler, Greggory J.; Miki, Toshio; Schmelzer, Eva; Pekor, Christopher; Zhang, Xiaokui; Kang, Lin; Voskinarian-Berse, Vanessa; Abbot, Stewart; Zeilinger, Katrin

    2012-01-01

    Continuous production of red blood cells (RBCs) in an automated closed culture system using hematopoietic stem cell (HSC) progenitor cell populations is of interest for clinical application because of the high demand for blood transfusions. Previously, we introduced a four-compartment bioreactor that consisted of two bundles of hollow fiber microfiltration membranes for transport of culture medium (forming two medium compartments), interwoven with one bundle of hollow fiber membranes for transport of oxygen (O2), carbon dioxide (CO2), and other gases (forming one gas compartment). Small-scale prototypes were developed of the three-dimensional (3D) perfusion cell culture systems, which enable convection-based mass transfer and integral oxygenation in the cell compartment. CD34+ HSC were isolated from human cord blood units using a magnetic separation procedure. Cells were inoculated into 2- or 8-mL scaled-down versions of the previously designed 800-mL cell compartment devices and perfused with erythrocyte proliferation and differentiation medium. First, using the small-scale 2-mL analytical scale bioreactor, with an initial seeding density of 800,000 cells/mL, we demonstrated approximately 100-fold cell expansion and differentiation after 7 days of culture. An 8-mL laboratory-scale bioreactor was then used to show pseudocontinuous production by intermediately harvesting cells. Subsequently, we were able to use a model to demonstrate semicontinuous production with up to 14,288-fold expansion using seeding densities of 800,000 cells/mL. The down-scaled culture technology allows for expansion of CD34+ cells and stimulating these progenitors towards RBC lineage, expressing approximately 40% CD235+ and enucleation. The 3D perfusion technology provides an innovative tool for studies on RBC production, which is scalable. PMID:21933020

  3. Change of carcinogenic chrysotile fibers in the asbestos cement (eternit) to harmless waste by artificial carbonatization: Petrological and technological results

    Energy Technology Data Exchange (ETDEWEB)

    Radvanec, Martin; Tuček, Ľubomír; Derco, Ján; Čechovská, Katarína [State Geological Institute of Dionýz Štúr, Mlynská dolina 1, SK-817 04 Bratislava (Slovakia); Németh, Zoltán, E-mail: zoltan.nemeth@geology.sk [State Geological Institute of Dionýz Štúr, Mlynská dolina 1, SK-817 04 Bratislava (Slovakia)

    2013-05-15

    Highlights: ► Carcinogenic chrysotile fibers in asbestos cement (eternit) are liquidated. ► Thermally modified eternit grist (at 650 °C, 1 h) reacts with CO{sub 2} + water. ► Carbonates hydromagnesite and magnesite are the newly formed products of artificial carbonatization. ► Neutralizing of extreme pH values (around 12) at large eternit dumps. ► An alternative methodology for permanent liquidation of a part of CO{sub 2} emissions. -- Abstract: Asbestos cement materials, mainly the eternit roof ceiling, being widely applied in the past, represent a serious environmental load. The solar radiation, rain and frost cause the deliberation of cement from the eternit roofing and consequently the wind contaminates the surrounding area by the asbestos (chrysotile) fibers. In combination with other carcinogens (e.g. smoking), or at reduced immunity of a man, they may cause serious respiratory diseases and lung cancer. The article presents the procedure and experimental results of artificial carbonatization, applied in the asbestos cement (eternit). The wet crushed and pulverized asbestos cement was thermally modified at 650 °C and then the chrysotile fibers easily and completely reacted with the mixture of CO{sub 2} and water, producing new Mg-rich carbonates – hydromagnesite and magnesite: 2Mg{sub 3}Si{sub 2}O{sub 5}(OH){sub 3thermally} {sub modified} {sub chrysotile}+5CO{sub 2}+nH{sub 2}O→Mg{sub 5}(CO{sub 3}){sub 4}(OH){sub 2}⋅4H{sub 2}O{sub hydromagnesite}+MgCO{sub 3magnesite}+4SiO{sub 2} · nH{sub 2}O{sub in} a{sub morphous} {sub phase};n=3÷9 Applying this methodology, the asbestos-bearing waste can be stabilized and environmentally friendly permanently deposited. Finding a way of neutralizing of extreme pH values (around 12) at large eternit dumps represents also an asset of presented research. Simultaneously, the artificial carbonatization of chrysotile asbestos, applying CO{sub 2}, offers an alternative way for permanent liquidation of a part of

  4. Fiber optics standard dictionary

    CERN Document Server

    Weik, Martin H

    1997-01-01

    Fiber Optics Vocabulary Development In 1979, the National Communications System published Technical InfonnationBulle­ tin TB 79-1, Vocabulary for Fiber Optics and Lightwave Communications, written by this author. Based on a draft prepared by this author, the National Communications System published Federal Standard FED-STD-1037, Glossary of Telecommunications Terms, in 1980 with no fiber optics tenns. In 1981, the first edition of this dictionary was published under the title Fiber Optics and Lightwave Communications Standard Dictionary. In 1982, the then National Bureau of Standards, now the National Institute of Standards and Technology, published NBS Handbook 140, Optical Waveguide Communications Glossary, which was also published by the General Services Admin­ istration as PB82-166257 under the same title. Also in 1982, Dynamic Systems, Inc. , Fiberoptic Sensor Technology Handbook, co-authored and edited by published the this author, with an extensive Fiberoptic Sensors Glossary. In 1989, the handbook w...

  5. Fiber biology

    Science.gov (United States)

    Cotton fiber cells arising from seed epidermis is the most important agricultural textile commodity in the world. To produce fully mature fibers, approximately two months of fiber developmental process are required. The timing of four distinctive fiber development stages consisting of initiation, ...

  6. Advanced Carbon Fiber Nears Broad Automotive Use

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    General Motors and Teijin Limited, a leader in the carbon fiber and composites industry, will co-develop advanced carbon fiber composite technologies for potential high-volume use globally in GM cars, trucks and crossovers.

  7. Improving digestive utilization of fiber-rich feedstuffs in pigs and poultry by processing and enzyme technologies: A review

    NARCIS (Netherlands)

    Vries, de S.; Pustjens, A.M.; Schols, H.A.; Hendriks, W.H.; Gerrits, W.J.J.

    2012-01-01

    The effects of processing technologies, whether or not combined with cell wall degrading enzymes, on the physicochemical properties of non-starch polysaccharides (NSP) and the resulting effects on NSP degradation in both pigs and poultry were reviewed. Evaluation of the effects of processing technol

  8. Fiber Pulling Apparatus

    Science.gov (United States)

    Workman, Gary L.; Smith, Guy A.; OBrien, Sue; Adcock, Leonard

    1998-01-01

    The fiber optics industry has grown into a multi-billion marketplace that will continue to grow into the 21st century. Optical fiber communications is currently dominated by silica glass technology. Successful efforts to improve upon the low loss transmission characteristics of silica fibers have propelled the technology into the forefront of the communications industry. However, reaching the theoretical transmission capability of silica fiber through improved processing has still left a few application areas in which other fiber systems can provide an influential role due to specific characteristics of high theoretical transmission in the 2 - 3 micron wavelength region. One of the other major materials used for optical fibers is the systems based upon Heavy Metal Fluoride Glass (HMFG). Commercial interest is driven primarily by the potential for low loss repeaterless infrared fibers. An example of the major communications marketplace which would benefit from the long distance repeaterless capability of infrared fibers is the submarine cables which link the continents. When considering commercial interests, optical fiber systems provide a healthy industrial position which continues to expand. Major investments in the systems used for optical fiber communications have continued to increase each year and are predicted to continue well into the next century. Estimates of 8.5% compounded annually are predicted through 1999 for the North American market and 1 1 % worldwide. The growth for the optical fiber cable itself is expected to continue between 44 and 50 per cent of the optical fiber communications budget through 1999. The total budget in 1999 world-wide is expected to be in the neighborhood of $9 billion. Another survey predicts that long haul telecommunications represents 15% of a world-wide fiber optics market in 1998. The actual amount allotted to cable was not specified. However, another market research had predicted that the cable costs alone represents more

  9. 光纤传感器在物联网关键技术中的应用%Optical fiber sensors application of the key technology in the internet of things

    Institute of Scientific and Technical Information of China (English)

    王鹏宇

    2012-01-01

    随着近年来光纤传感技术的发展,光纤传感器越来越多的应用于物联网中原始数据的采集。为了可以将光纤传感器更好的应用于物联网技术.文中在描述了物联网技术和光纤传感技术基本概念和理论的基础上,阐述了光纤传感器在石油工业、电力工业、建筑工程、军事安防和医疗领域的实际应用情况,最后提出了光纤传感器在物联网技术中的应用还需要解决造价高、产品集成化和实用化困难的问题。%Optical fiber sensors are applied to the original data collection in the Internet of things more and more, with the development of the optical fiber sensing technology.To study the better application of the optical fiber sensors, described the basic conceptions and theories of the Internet of Things and optical fiber sensing technology ;reported the optical fiber sensing technology application in the different fields such as petroleum industry, electric power system, building fields, military security and medical system; pointed out the application difficulties in the Internet of things including the high coast, hard integration and practice of the optical fiber sensors.

  10. Optical fiber-based devices and applications

    Institute of Scientific and Technical Information of China (English)

    Perry Ping SHUM; Jonathan C. KNIGHT; Jesper LAEGSGAARD; Dora Juan Juan HU

    2010-01-01

    @@ Optical fiber technology has undergone tremendous growth and development over the last 40 years. Optical fibers constitute an information super highway and are vital in enabling the proliferating use of the Internet. Optical fiber is also an enabling technology which can find applications in sensing, imaging, biomedical, machining, etc. There have been a few milestones in the advancement of optical fiber technology. Firstly, the invention and development of the laser some 50 years ago made optical communications possible. Secondly, the fabrication of low-loss optical fibers has been a key element to the success of optical communication.

  11. Improved fiber-optic link for the phase reference distribution system for the TESLA technology based projects

    Science.gov (United States)

    Czuba, Krzysztof; Felber, Matthias

    2005-09-01

    The UV Free-Electron Laser (UVFEL) [1], The X-Ray Free-Electron Laser (XFEL) [2] and The International Linear Accelerator (ILC) [9] projects will require phase synchronization of various RF frequency subsystems on kilometer distances with accuracy better than 1ps. To fulfill these requirements, a phase reference distribution system concept was proposed and a prototype was developed for tests in the TESLA Test Facility 2 (TTF2). An important part of the phase reference system is the fiber-optic phase stable, long distance link described in this paper. An interferometrical scheme with feedback on phase, suppressing long term phase drifts induced by temperature changes was developed and tested in laboratory and under accelerator conditions. A motorized optical delay line was used in the system to compensate for phase errors. Described are error considerations and most important project issues like the hardware development and the real time phase controller software. The presented measurement results satisfy the design requirements. Experience gained during the experiments yielded proposals for system improvements.

  12. Effects of membrane-filtered soy hull pectin and pre-emulsified fiber/oil on chemical and technological properties of low fat and low salt meat emulsions.

    Science.gov (United States)

    Kim, Hyun-Wook; Lee, Yong Jae; Kim, Yuan H Brad

    2016-06-01

    The objectives of this study were to determine efficacy of a membrane filtration in soy hull pectin purification and evaluate combined effects of soy hull pectin and pre-emulsified fiber/oil (PE) on chemical composition and technological properties of low fat and low salt meat emulsions. Soy hull pectin was purified through two different methods (alcohol-washed (ASP) and membrane-filtered (MSP)). Insoluble soy hull residues after pectin extraction were incorporated with sunflower oil and water for the PE preparation. Meat emulsion was formulated with 58 % pork, 20 % ice, 20 % pork backfat, and 2 % NaCl as control. A total of six low fat and low salt meat emulsions (1 % NaCl and 10 % backfat) was manufactured with 1 % pectin (with/without ASP or MSP) and 10 % PE (with/without). The pectin content of ASP and MSP was 0.84 and 0.64 g L-galacturonic acid/g dry sample, respectively. The inclusion of soy hull pectin caused similar results on chemical composition, color, cooking loss, and texture of the meat emulsions, regardless of the purification method. In addition, positive impacts of the combined treatments with soy hull pectin and PE compared to single treatments on cooking loss and texture of the meat emulsions were observed. Results suggest that membrane filtration could be an effective alternative method to purify pectin, instead of alcohol-washing, and both soluble pectin and insoluble fiber from soy hulls could be used as a functional non-meat ingredient to manufacture various low fat and low salt meat products.

  13. 麒麟藻渣制备膳食纤维工艺研究①%Extraction Technology of Dietary Fiber from Eucheuma Waste

    Institute of Scientific and Technical Information of China (English)

    李来泉; 潘江球; 戴子程

    2015-01-01

    以提取卡拉胶后的麒麟藻废渣为原料,利用木瓜蛋白酶和α-淀粉酶对粗纤维进行酶解,制备膳食纤维。正交试验优化提取工艺,得出最佳工艺条件为:料液比为1∶30,时间1.5 h,温度为65℃,蛋白酶用量为0.35%、α-淀粉酶用量为1.5%,膳食纤维得率为35.58%。按照最佳工艺条件提取的麒麟藻渣膳食纤维,膨胀力10.93 mL/g,持水力721.72%。%This research optimize the enzymatic preparation of dietary fiber from Eucheuma waste, usingα-amylase and papain. The result of the orthogonal experiment showed that: 1∶30 material/liquid ratio, 1.5 h, 65℃, 0.35% papain enzyme dosage, 1.5% α-amylase dosage, TDF yoeld was 35.58%. According to the optimum technological conditions for extraction of Eucheuma waste fiber. The swelling power and water-holding capacity of the obtained product were 10.93 mL/g, 721.72%.

  14. Fiber coupler end face wavefront surface metrology

    Science.gov (United States)

    Compertore, David C.; Ignatovich, Filipp V.; Marcus, Michael A.

    2015-09-01

    Despite significant technological advances in the field of fiber optic communications, one area remains surprisingly `low-tech': fiber termination. In many instances it involves manual labor and subjective visual inspection. At the same time, high quality fiber connections are one of the most critical parameters in constructing an efficient communication link. The shape and finish of the fiber end faces determines the efficiency of a connection comprised of coupled fiber end faces. The importance of fiber end face quality becomes even more critical for fiber connection arrays and for in the field applications. In this article we propose and demonstrate a quantitative inspection method for the fiber connectors using reflected wavefront technology. The manufactured and polished fiber tip is illuminated by a collimated light from a microscope objective. The reflected light is collected by the objective and is directed to a Shack-Hartmann wavefront sensor. A set of lenses is used to create the image of the fiber tip on the surface of the sensor. The wavefront is analyzed by the sensor, and the measured parameters are used to obtain surface properties of the fiber tip, and estimate connection loss. For example, defocus components in the reflected light indicate the presence of bow in the fiber end face. This inspection method provides a contact-free approach for quantitative inspection of fiber end faces and for estimating the connection loss, and can potentially be integrated into a feedback system for automated inspection and polishing of fiber tips and fiber tip arrays.

  15. The Progress on Physiological Function and Extraction Technology of Dietary Fiber%膳食纤维的生理保健功能及其提取工艺的研究进展

    Institute of Scientific and Technical Information of China (English)

    权美平; 侯云云

    2013-01-01

    Dietary fiber was the seventh nutrients which human required, and it played an important role in the maintenance of a balanced diet. This paper introduced the sources and distribution of dietary fiber, summarized progress of physiological function and extraction technology, and put forward people should increase the dietary fiber intake and diversity in daily diet.%膳食纤维是人类所需的第七大营养素,在维持膳食平衡方面发挥着重要的作用.本文介绍了目前膳食纤维的来源与分布,综述其生理保健功能和提取工艺技术的研究进展,提出人们应增加日常饮食中膳食纤维的摄入量及摄取的多样性.

  16. Fiber Optic Microphone

    Science.gov (United States)

    Cho, Y. C.; George, Thomas; Norvig, Peter (Technical Monitor)

    1999-01-01

    Research into advanced pressure sensors using fiber-optic technology is aimed at developing compact size microphones. Fiber optic sensors are inherently immune to electromagnetic noise, and are very sensitive, light weight, and highly flexible. In FY 98, NASA researchers successfully designed and assembled a prototype fiber-optic microphone. The sensing technique employed was fiber optic Fabry-Perot interferometry. The sensing head is composed of an optical fiber terminated in a miniature ferrule with a thin, silicon-microfabricated diaphragm mounted on it. The optical fiber is a single mode fiber with a core diameter of 8 micron, with the cleaved end positioned 50 micron from the diaphragm surface. The diaphragm is made up of a 0.2 micron thick silicon nitride membrane whose inner surface is metallized with layers of 30 nm titanium, 30 nm platinum, and 0.2 micron gold for efficient reflection. The active sensing area is approximately 1.5 mm in diameter. The measured differential pressure tolerance of this diaphragm is more than 1 bar, yielding a dynamic range of more than 100 dB.

  17. Dietary Fiber

    Science.gov (United States)

    Fiber is a substance in plants. Dietary fiber is the kind you eat. It's a type of carbohydrate. You may also see it listed on a food label as soluble ... types have important health benefits. Good sources of dietary fiber include Whole grains Nuts and seeds Fruit and ...

  18. Fiber Amplifiers

    DEFF Research Database (Denmark)

    Rottwitt, Karsten

    2017-01-01

    The chapter provides a discussion of optical fiber amplifiers and through three sections provides a detailed treatment of three types of optical fiber amplifiers, erbium doped fiber amplifiers (EDFA), Raman amplifiers, and parametric amplifiers. Each section comprises the fundamentals including t...

  19. Blended Yarns of Modacrylic Fibers with Silk Protein

    Institute of Scientific and Technical Information of China (English)

    江慧

    2001-01-01

    The fiber properties of modacrylic fibers with silk protein and spinning technology for blended knitting yarns are studied. By testing the fiber properties, fiber spinnability is analysed. Modacrylic fibers with silk protein are brittle and have poor cohesion, so the key to process modacrylic fibers with silk protein lies in forming lap and sliver. During opening and carding, low speed is used to decrease fiber damage and the proper static resistant oil is applied to eliminate lapping fibers. Besides, the temperature and relative humidity have to be strictly controlled. The applications of modacrylic fibers with silk protein are also put forward.

  20. Application of Fiber Optic Instrumentation

    Science.gov (United States)

    Richards, William Lance; Parker, Allen R., Jr.; Ko, William L.; Piazza, Anthony; Chan, Patrick

    2012-01-01

    Fiber optic sensing technology has emerged in recent years offering tremendous advantages over conventional aircraft instrumentation systems. The advantages of fiber optic sensors over their conventional counterparts are well established; they are lighter, smaller, and can provide enormous numbers of measurements at a fraction of the total sensor weight. After a brief overview of conventional and fiber-optic sensing technology, this paper presents an overview of the research that has been conducted at NASA Dryden Flight Research Center in recent years to advance this promising new technology. Research and development areas include system and algorithm development, sensor characterization and attachment, and real-time experimentally-derived parameter monitoring for ground- and flight-based applications. The vision of fiber optic smart structure technology is presented and its potential benefits to aerospace vehicles throughout the lifecycle, from preliminary design to final retirement, are presented.

  1. Holey fiber amplifiers and lasers

    OpenAIRE

    Richardson, D J; Furusawa, K.; Kogure, T.; Price, J.H.V.; Lee, J.H.; Monro, T.M.

    2004-01-01

    We review our recent activities in the development of small-core, active holey fibers and describe a number of experiments that highlight the advantages of this technology within a range of both linear and nonlinear devices.

  2. 20 years of KVH fiber optic gyro technology: the evolution from large, low performance FOGs to compact, precise FOGs and FOG-based inertial systems

    Science.gov (United States)

    Napoli, Jay

    2016-05-01

    Precision fiber optic gyroscopes (FOGs) are critical components for an array of platforms and applications ranging from stabilization and pointing orientation of payloads and platforms to navigation and control for unmanned and autonomous systems. In addition, FOG-based inertial systems provide extremely accurate data for geo-referencing systems. Significant improvements in the performance of FOGs and FOG-based inertial systems at KVH are due, in large part, to advancements in the design and manufacture of optical fiber, as well as in manufacturing operations and signal processing. Open loop FOGs, such as those developed and manufactured by KVH Industries, offer tactical-grade performance in a robust, small package. The success of KVH FOGs and FOG-based inertial systems is due to innovations in key fields, including the development of proprietary D-shaped fiber with an elliptical core, and KVH's unique ThinFiber. KVH continually improves its FOG manufacturing processes and signal processing, which result in improved accuracies across its entire FOG product line. KVH acquired its FOG capabilities, including its patented E•Core fiber, when the company purchased Andrew Corporation's Fiber Optic Group in 1997. E•Core fiber is unique in that the light-guiding core - critical to the FOG's performance - is elliptically shaped. The elliptical core produces a fiber that has low loss and high polarization-maintaining ability. In 2010, KVH developed its ThinFiber, a 170-micron diameter fiber that retains the full performance characteristics of E•Core fiber. ThinFiber has enabled the development of very compact, high-performance open-loop FOGs, which are also used in a line of FOG-based inertial measurement units and inertial navigation systems.

  3. Water Fibers

    CERN Document Server

    Douvidzon, Mark L; Martin, Leopoldo L; Carmon, Tal

    2016-01-01

    Fibers constitute the backbone of modern communication and are used in laser surgeries; fibers also genarate coherent X-ray, guided-sound and supercontinuum. In contrast, fibers for capillary oscillations, which are unique to liquids, were rarely considered in optofluidics. Here we fabricate fibers by water bridging an optical tapered-coupler to a microlensed coupler. Our water fibers are held in air and their length can be longer than a millimeter. These hybrid fibers co-confine two important oscillations in nature: capillary- and electromagnetic-. We optically record vibrations in the water fiber, including an audio-rate fundamental and its 3 overtones in a harmonic series, that one can hear in soundtracks attached. Transforming Micro-Electro-Mechanical-Systems [MEMS] to Micro-Electro-Capillary-Systems [MECS], boosts the device softness by a million to accordingly improve its response to minute forces. Furthermore, MECS are compatible with water, which is a most important liquid in our world.

  4. ASSESMENT OF SELF HEALING PROPERTY IN HYBRID FIBER POLYMERIC COMPOSITE

    OpenAIRE

    2011-01-01

    In recent years, Natural fiber reinforced composites is an emerging area in polymer technology. Fibers resulting from plants are considered a budding substitute for non-renewable synthetic fibers like glass and carbon fibers. The objective of this study is to merge the benefits of natural and synthetic fibers by developing ahybrid composite of jute and glass fibers along with self healing property to eliminate delamination without compromising the benefits of hybridization. This concept offer...

  5. Self Regulating Fiber Fuel Cell

    Science.gov (United States)

    2010-08-16

    energy numbers are 2.3X and 5.7X the theoretical values for lithium thionyl chloride respectively (1100 Whr/liter and 590 Whr/kg), which has the...REPORT Self Regulating Fiber Fuel Cell 14. ABSTRACT 16. SECURITY CLASSIFICATION OF: Advances in lithium primary battery technology, which serves as the...Prescribed by ANSI Std. Z39.18 - 16-Aug-2010 Self Regulating Fiber Fuel Cell Report Title ABSTRACT Advances in lithium primary battery technology

  6. 碳纤维复合材料废弃物的回收与再利用技术发展%Technology Development of Recovery & Reuse of Carbon Fiber Composite

    Institute of Scientific and Technical Information of China (English)

    罗益锋

    2013-01-01

    本文主要介绍了国外一些大学、科研院所和企业在碳纤维增强塑料(CFRP)和碳纤维回收再利用领域最新的技术研究进展,并对我国今后在该领域的发展提出了建议。%The current R&D situation of recycling carbon fiber reinforced plastic (CFRP) wastes was illustrated in this article, in terms of several relative technologies and processes introduced by universities;research institutes and companies abroad. Furthermore, some suggestions on how to develop domestic technologies of recycling carbon fibers from CFRP wastes and reuse them were put forward.

  7. 光纤通信技术在消防部队的实践与发展前景%Application of Optical Fiber Communication Technology in Fire Forces and Its Development Prospect

    Institute of Scientific and Technical Information of China (English)

    黄雅蕾

    2015-01-01

    光纤通信技术广泛应用到各行各业,促进了社会经济的快速发展。文中针对光纤通信技术在消防部队的应用情况进行分析和探讨,并对其发展前景进行相关展望。%Optical fiber communication technology has been widely applied to all walks of life,which promotes rapid development of social economy.In this article,application of optical fiber communication technology in fire department is analyzed and discussed,and its development prospect is presented.

  8. 超高分子量聚乙烯纤维的生产技术和市场分析%Production technology and market analysis of ultrahigh-molecular weight polyethylene fiber

    Institute of Scientific and Technical Information of China (English)

    武红艳

    2012-01-01

    介绍了超高分子量聚乙烯(UHMWPE)纤维的主要生产方法,对干法纺丝和湿法纺丝工艺路线进行了比较;分析了国内外UHMWPE纤维的生产现状、市场需求及预测;从工艺路线、生产规模及产品质量方面比较了国内外UHMWPE纤维产品之间的差距;指出干法纺丝工艺路线是今后UHMWPE纤维的主要生产技术,我国应加大干法纺丝工艺的研发力度,尤其是十氢萘的回收技术,提高单机产量,实现规模化生产.%The dominant production technologies for ultrahigh-molecular weight polyethylene ( UHMWPE) fiber were introduced. The dry spinning process and wet spinning process were compared. The production status, market demand and forecast of UHMWPE fiber were analyzed in China and abroad. The gap between China and international UHMWPE fibers was analyzed from the aspects of process technologies, production scale and product quality. It was pointed out that dry spinning process should be the dominant production technology for UHMWPE fiber in the future, and China should enhance the research of dry spinning process, particularly decalin recovery technology, increase the single line output and realize the scale production.

  9. Optical Fiber Chemical Sensor with Sol-Gel Derived Refractive Material as Transducer for High Temperature Gas Sensing in Clean Coal Technology

    Energy Technology Data Exchange (ETDEWEB)

    Shiquan Tao

    2006-12-31

    The chemistry of sol-gel derived silica and refractive metal oxide has been systematically studied. Sol-gel processes have been developed for preparing porous silica and semiconductor metal oxide materials. Micelle/reversed micelle techniques have been developed for preparing nanometer sized semiconductor metal oxides and noble metal particles. Techniques for doping metal ions, metal oxides and nanosized metal particles into porous sol-gel material have also been developed. Optical properties of sol-gel derived materials in ambient and high temperature gases have been studied by using fiber optic spectroscopic techniques, such as fiber optic ultraviolet/visible absorption spectrometry, fiber optic near infrared absorption spectrometry and fiber optic fluorescence spectrometry. Fiber optic spectrometric techniques have been developed for investigating the optical properties of these sol-gel derived materials prepared as porous optical fibers or as coatings on the surface of silica optical fibers. Optical and electron microscopic techniques have been used to observe the microstructure, such as pore size, pore shape, sensing agent distribution, of sol-gel derived material, as well as the size and morphology of nanometer metal particle doped in sol-gel derived porous silica, the nature of coating of sol-gel derived materials on silica optical fiber surface. In addition, the chemical reactions of metal ion, nanostructured semiconductor metal oxides and nanometer sized metal particles with gas components at room temperature and high temperatures have also been investigated with fiber optic spectrometric methods. Three classes of fiber optic sensors have been developed based on the thorough investigation of sol-gel chemistry and sol-gel derived materials. The first group of fiber optic sensors uses porous silica optical fibers doped with metal ions or metal oxide as transducers for sensing trace NH{sub 3} and H{sub 2}S in high temperature gas samples. The second group of

  10. 基于专利信息的中国光纤预制棒技术竞争态势分析%Competition Tendency Analysis on Chinese Patent Information of Optical Fiber Perform Rod Technology

    Institute of Scientific and Technical Information of China (English)

    王伟

    2012-01-01

    光纤预制棒是光纤生产的上游产品和光电子产业的基础材料之一,具有较高的附加价值,同时也是我国对外依存度较高的产品.采用定量的方法,对在中国申请的光纤预制棒专利技术进行了数据挖掘和分析研究,揭示其发展现状和趋势、热点和关键技术领域、竞争和合作对手的能力水平及发展意图等,为国内外相关企业和研究机构了解中国光纤预制棒行业的技术状况提供重要的量化参考依据.%Optical fiber preform rod is a upstream production of the optical fiber product and also one of the basic materials in the optoelectronic industry. It is a greatly external depended product in the domestic with high additional value. The pa-per reveals a series aspect of the situation of optical fiber preform rod, such as the current and future development, hot and key technology field, the ability of competition and cooperation, the development level and the opponent intention, through data mining and analysis of the application of the optical fiber perform rod patent technology in China. Our study provides important quantitative reference for the domestic and foreign relevant enterprises and research insliiutes to the understanding of optical fiber preform rod industry technical status in China.

  11. 绿茶渣中膳食纤维提取工艺的研究%Study on the Extraction Technology of Dietary Fiber from Green-tea Residue

    Institute of Scientific and Technical Information of China (English)

    黄艳

    2011-01-01

    本文以热水浸泡过的绿茶渣为原料,采用碱性提取法制备膳食纤维。利用正交试验设计确定绿茶渣中不溶性膳食纤维的最佳提取工艺,结果表明:绿茶渣中可溶性膳食纤维含量极少,没有提取的经济价值;不溶性膳食纤维的最佳提取工艺参数为:NaOH浓度为0.4mol/L、处理时间为60min、提取温度为50℃,此时提取率为34.64%。%Dietary fiber was prepared by alkalinity extration from green-tea residue soaked in hot water. Through orthogonal experiment design, the optimun extration technology of dietary fiber was determined. The results showed that there was little soluble dietary fiber in the green-tea residue. Therefore, there was no economic value on the extraction of soluble dietary fiber from green tea residue. The optimum conditions of the extration of insoluble dietary fiber were as follow: the NaOH concentraion was 0.4 tool/L, the extraction time was 60 rain and the extraction temperature was at 50℃. Under the condition, the extraction rate of insoluble dietary fiber from green-tea residue was 34.64%.

  12. 纯壳聚糖纤维关键技术研究及其产业化%Research on the key technology of pure chitosan fibers and industrialization

    Institute of Scientific and Technical Information of China (English)

    周家村; 林亮; 付晓

    2012-01-01

    简介了纯海洋动物再生纤维—壳聚糖纤维的理化性质、生物学特性、抑菌机理以及调节人体皮肤微生态平衡的保健功能。重点阐述了由废弃虾、蟹壳为原料,生产纯壳聚糖纤维的关键技术和全程无毒化纺丝的工艺优点,纯壳聚糖纤维在医药、工业、纺织等领域的应用现状,以及实现原料国产化及纤维产业化发展。%This paper briefly describes the physical and chemical properties of pure marine animals recycled fiber-chitosan fiber,with its biological characteristics and the bacteriostatic mechanisms as well as the health care functions of maintaining the human skin micro-ecological balance.The key technology of producing chitosan using abandoned shrimp and crab shell as raw materials,and the whole non-toxic spinning technology advantages are described in detail.We illustrates the application of the pure chitosan fiber used in medical,industrial,textile and such kind of fields,and the realization of raw materials' localization and the industrialized development.

  13. 家纺用化学纤维生产技术与装备的发展现状与趋势%Technology and Equipment Development of Chemical Fiber Used in Home Textiles

    Institute of Scientific and Technical Information of China (English)

    芦长椿

    2015-01-01

    本文介绍了家纺用化学纤维几个品种的生产方法和技术特征,包括膨体连续长丝(BCF)、空气变形丝(ATY)以及采用一步法工艺生产的地毯用短纤维。目前国内铺敷织物用纤维生产基本靠进口设备,技术与装备的国产化已势在必行。而随着人们消费理念的变化,亦要考虑建筑环境标准和生态认证对家用纺织品市场的影响。%Process and technology characterics of various types of chemical fiber used in home textiles are introduced in this article, including bulking continuous filament (BCF) , air textured yarn (ATY) as well as the staple fibers used for carpet with one-step process. Currently, the production of domestic chemical fiber used in carpet and flooring still relies on imported equipment, and localization of relative technology and equipment is urgent. Furthermore, with the consumption concept is changing, it is essential to pay attention to the impact of building environment standards and eco-labels on the home textile market.

  14. Fiber Tracking Technology Based on Riemannian Manifold Inverse Distance Interpolation%基于黎曼流形反距离插值的纤维追踪技术研究

    Institute of Scientific and Technical Information of China (English)

    范宏; 邹翎; 王凯; 李柏林; 高业文

    2011-01-01

    Purpose To improve the precision of fiber tracking andto better understandthe normal brain function. Materials andMethods Based on the streamline tracking technology, this algorithm introduced Riemannian metrics and inverse distance weights tointerpolatethe diffusion tensor of current points. Results Using this new method, the fibers tracked from in vivo data were smoother and longer than those obtained using the conventional interpolation methods. Conclusion Riemannian manifold inverse distance interpolation is an effective fiber tracking technology.%目的 提高纤维追踪的精度,有助于理解正常脑功能.材料与方法在流线追踪的基础上,引入黎曼测度和反距离权重,从而完成对当前点的张量值插值.结果 新插值方法追踪出的纤维比传统插值方法的更长,更平滑.结论 该算法是一种有效的纤维追踪技术.

  15. Diode Pumped Fiber Laser.

    Science.gov (United States)

    1984-12-01

    FIBER LASERS I. Nd:YAG FIBER LASER FABRICATION .............. 5 A. FIBER GROWTH .......................... 5 B. FIBER PROCESSING 7...1.32 pm FIBER LASERS I. Nd:YAG FIBER LASER FABRICATION A. FIBER GROWTH The single crystal fibers used in this work were grown at Stanford University

  16. Technology.

    Science.gov (United States)

    Online-Offline, 1998

    1998-01-01

    Focuses on technology, on advances in such areas as aeronautics, electronics, physics, the space sciences, as well as computers and the attendant progress in medicine, robotics, and artificial intelligence. Describes educational resources for elementary and middle school students, including Web sites, CD-ROMs and software, videotapes, books,…

  17. Nonlinearity of InP-Doped Fibers

    Institute of Scientific and Technical Information of China (English)

    ZHANG Ru; CHEN Xi; WANG Jin; DUAN Yu-Wen

    2009-01-01

    By combining nano-technology with fiber technology, an optical fiber doped with semiconductor nano-particles as InP is fabricated by using the modified chemical vapor deposition (MCVD) method. Proved by experiment,the fiber has excellent waveguide characteristics, and the concentration of InP is approximately 0.1%. By using a scanning electron microscope, a stereo-scan photograph of the fiber is obtained, and based on the graph,presentations of the fiber under both magnetic and electronic fields are simulated, the effective core area Aeff≈ 10 μm2 is calculated, and so is the nonlinear index γ = 10.53 W-1/Km of the fiber. This research leads a new method of high nonlinearity fiber fabrication.

  18. Frequency-Locked Single-Frequency Fiber Laser at 2 Micron Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Based on our proprietary fiber technology and extensive experience in fiber laser development, a new single-frequency 2?]m fiber laser source will be developed. The...

  19. Application of the fiber-optic sensor thickness inspection technology on ZJ19B tobacco machinery%光纤传感器厚度检测技术在ZJ19B烟机的运用

    Institute of Scientific and Technical Information of China (English)

    倪慧彩

    2012-01-01

    介绍了光纤传感器检测厚度的检测技术在卷烟设备中的运用,概述了光纤传感器检测系统的基本结构、工作原理及优点,简述了该系统安装和校准方法,提高了检测的准确率和产品质量,降低了消耗.%This article introduces the application of the fiber-optic sensor thickness inspection technology on the cigarette making equipment. It explains the basic structure, working principle and advantage of the fiber-optic sensor thickness inspection system and briefly gives the installing procedures, aligning and adjusting methods of the system. This achieves enhancing the precise rate, guarantees the product quality and reduces the consumption.

  20. Características tecnológicas dos caules de juta visando à produção de pastas celulósicas para papel Technological characteristics of jute stalks to produce cellulosic fibers for paper making

    Directory of Open Access Journals (Sweden)

    Anísio Azzini

    1986-01-01

    Full Text Available Foram estudadas seis variedades de juta quanto à densidade básica do caule e seus teores em líber, lenho, fibra, celulose e dimensões das fibras. Os valores para a densidade básica, de 0,270 a 0,335g/cm³, evidenciaram suas diferenças tecnológicas. Os caules da variedade introduzida sob nº I-52445 foram os menos densos, com menores teores de fibra e de celulose. Os teores de líber (36,6 a 40,6%, lenho (59,4 a 63,4%, fibra (17,3 a 22,0% e celulose (42,4 a 45,4%, bem como o estudo micrométrico das fibras liberianas e lenhosas, evidenciaram as possibilidades de utilização dos caules de juta como matéria-prima para produção de fibras celulósicas para papel.In this paper six varieties of jute identified by the numbers I-53502, I -53503, I -52444, I -52445, I -52446 e Roxa were studied considering the following stalk technological characteristics: basic density, contents of bast, woody fiber, cellulose and fiber dimensions. The basic density ranged from 0.270 to 0.335g/cm³, showing differences among varieties. The contents of bast ranged from 36.6 to 40.6%, woody from 49.4 to 63.4%, fiber from 17.3 to 22.0%, and cellulose from 42.4 to 45.4%; the bast fiber lengths ranged from 1.99 to 2.14mm and woody 0.70 to 0.82mm. These results indicated the great potential the jute stalks have to produce cellulose fibers for paper making.

  1. Two Fiber Optical Fiber Thermometry

    Science.gov (United States)

    Jones, Mathew R.; Farmer, Jeffery T.; Breeding, Shawn P.

    2000-01-01

    An optical fiber thermometer consists of an optical fiber whose sensing tip is given a metallic coating. The sensing tip of the fiber is essentially an isothermal cavity, so the emission from this cavity will be approximately equal to the emission from a blackbody. Temperature readings are obtained by measuring the spectral radiative heat flux at the end of the fiber at two wavelengths. The ratio of these measurements and Planck's Law are used to infer the temperature at the sensing tip. Optical fiber thermometers have high accuracy, excellent long-term stability and are immune to electromagnetic interference. In addition, they can be operated for extended periods without requiring re-calibration. For these reasons. it is desirable to use optical fiber thermometers in environments such as the International Space Station. However, it has recently been shown that temperature readings are corrupted by emission from the fiber when extended portions of the probe are exposed to elevated temperatures. This paper will describe several ways in which the reading from a second fiber can be used to correct the corrupted temperature measurements. The accuracy and sensitivity to measurement uncertainty will be presented for each method.

  2. Advances in photonic bandgap fiber functionality

    DEFF Research Database (Denmark)

    Lyngsøe, Jens Kristian

    In order to take advantage of the many intriguing optical properties of photonic bandgap fibers, there are some technological challenges that have to be addressed. Among other things this includes transmission loss and the fibers ability to maintain field polarization. The work presented...... in this thesis addresses these two fundamental properties in both hollow core photonic crystal fibers and solid photonic bandgap fibers. Transmission loss in hollow core photonic crystal fibers is dominated by light scattering at the silica surfaces inside the fiber. In the current work it has been...... experimentally demonstrated that the minimum loss wavelength is located in the spectral region around 2000 nm, where the transmission loss in these fibers is significantly lower than in conventional solid silica fibers. Additionally it has been shown that transmission loss can be lowered roughly 40...

  3. Automated fiber placement system technology for thermoplastic composites%热塑性复合材料自动纤维铺放装备技术

    Institute of Scientific and Technical Information of China (English)

    宋清华; 肖军; 立伟; 王显峰; 潘杰; 黄晓川

    2016-01-01

    Based on the automated fiber placement (AFP )in-situ curing technology of thermoplastic composite (TPC),we researched AFP system technology of thermoplastic composites,analyzed the functional requirements of AFP platform,proposed the overall planning scheme of platform,designed and developed the automatic prototype head of thermoplastic composites,meanwhile,proposed the schemes of tension control for prepreg,precise sending prepreg and closed-loop control for temperature.On this basis,feasibility verification experiments for the AFP sys-tem have been carried out to testify feasibility of the planning scheme and practical value of the platform.The results show that the experimental platform optimizes the matching of tension and laying speed,realizes the dynamic con-stant tension laying of prepreg and ensures the quality of the molding component according to the laying characteris-tics of thermoplastic composites.The experimental platform regulates the coordination of laying speed and sending prepreg to achieve precise positioning and security molding component size.The relationship between laying speed, heat power and heat flux distribution was established to realize high precision temperature field distribution control. Although the mechanical properties for AFP molding component are lower than those of hot moulded component, the AFP platform will lay foundation for wide use of AFP system technology in thermoplastic composites.%基于热塑性复合材料(TPC)自动纤维铺放(AFP)原位固结技术,开展热塑性复合材料 AFP 装备技术研究,分析 AFP平台的功能需求,提出平台总体规划方案,设计开发热塑性复合材料自动铺丝头,并提出预浸纱张力控制方案、精确送纱及温度闭环控制方案。在此基础上,设计 AFP系统可行性验证实验,证明方案的可行性和平台的实用价值。结果表明:本实验平台针对热塑性复合材料铺放特点,优化张力与铺放速度匹配,

  4. Application of Optical Fiber Data Transmission Technology into Digital Array Radar%光纤传输技术在数字阵列雷达中的应用

    Institute of Scientific and Technical Information of China (English)

    赵磊; 郭文卓

    2011-01-01

    随着数字阵列雷达的发展,天线阵面与控制中心之间需要交换的数据量越来越大,在这种情况下,光纤传输技术由于抗干扰性强、传输容量大等优点而被广泛采用.波分复用技术和光纤滑环技术的日渐成熟使得光纤传输系统在数字阵列雷达中的应用具备了工程可实现性.首先给出了典型的光纤传输系统构建方案,然后对光纤传输中的关键技术实现、光链路故障的检测和定位等做了分析.该方案已在某雷达中成功应用,性能稳定可靠.%With the development of digital array radar, the amount of data to be exchanged between antenna and control center is increasing remarkablely. To meet such requirements, optical fiber technology for data transmission has received extensive attention because of its high anti-interference performance and high transmission capacity. With the advancement of the techniques of wavelength division multiplexing (WDM) and fiber optic rotary joint, optical fiber data transmission now is applicable in digital array radar system. In this paper, a typical optical fiber transmission scheme is presented, and the analysis on the key technology and the fault detection and position of optical link is also performed. The scheme proposed is being successfully applied into certain radar product, and the performance is proved to be effective and reliable.

  5. Method of composite fluffing technology and its effect on properties of fluff pulp fiber%复合绒毛化及其对绒毛浆性能的影响

    Institute of Scientific and Technical Information of China (English)

    徐永建; 闫瑛; 岳小鹏; 张鼎军; 朱振峰

    2013-01-01

    以硫酸盐马尾松浆为原料,通过对比两种复合绒毛化方法对绒毛浆性能的影响得到,先对原浆纤维进行漂白,漂白接近终点时补加碱进行短时间的浓碱处理为较优的复合绒毛化方法,并通过进一步实验验证了该方法中进行短时间浓碱处理的合理性.结果表明,原浆纤维经复合绒毛化后,纸浆白度为76.66% ISO ,提高了52.77%,绒毛浆板耐破指数为0.57 kpa・m2/g ,下降了48.18%,绒毛浆吸收时间为8.42 s ,缩短了46.64%,吸收性为8.95 g/g ,干蓬松度为17.19 cm3/g ,这两个性能指标分别降低了10.23%,6.63%.%Composite fluffing technology of cellulose fiber in the process of fluff pulp making was researched using pinus massoniana lamb as the raw material .Effects on fluff pulp prop-erties of two composite fluffing technologies were compared .It indicated that bleaching the virgin fiber initially and then treating it with enormous alkali towards the end of bleaching was the more preferable method .It also revealed that when fiber was treated by this method , brightness of it was 76 .13% ISO and increased 51 .71% ,burst index was 0 .57 kpa・m2/g and decreased 48 .18% ,the absorption time was 8 .42 s and decreased 46 .64% in comparison with virgin fiber .Meanwhile ,absorption and dry bulkiness of the fiber decreased 10 .23% , 6 .63% ,respectively .In addition ,rationality of the more preferable method for its effects on fiber properties was also researched .

  6. Sensored fiber reinforced polymer grate

    Energy Technology Data Exchange (ETDEWEB)

    Ross, Michael P.; Mack, Thomas Kimball

    2017-08-01

    Various technologies described herein pertain to a sensored grate that can be utilized for various security fencing applications. The sensored grate includes a grate framework and an embedded optical fiber. The grate framework is formed of a molded polymer such as, for instance, molded fiber reinforced polymer. Further, the grate framework includes a set of elongated elements, where the elongated elements are spaced to define apertures through the grate framework. The optical fiber is embedded in the elongated elements of the grate framework. Moreover, bending or breaking of one or more of the elongated elements can be detected based on a change in a characteristic of input light provided to the optical fiber compared to output light received from the optical fiber.

  7. Vacuum fiber-fiber coupler

    Science.gov (United States)

    Heinrici, Axel; Bjelajac, Goran; Jonkers, Jeroen; Jakobs, Stefan; Olschok, Simon; Reisgen, Uwe

    2017-02-01

    Research and development carried out by the ISF Welding and Joining Institute of RWTH Aachen University has proven that combining high power laser and low vacuum atmosphere provides a welding performance and quality, which is comparable to electron beam welding. The developed welding machines are still using a beam forming which takes place outside the vacuum and the focusing laser beam has to be introduced to the vacuum via a suitable window. This inflexible design spoils much of the flexibility of modern laser welding. With the target to bring a compact, lightweight flying optics with flexible laser transport fibers into vacuum chambers, a high power fiber-fiber coupler has been adapted by II-VI HIGHYAG that includes a reliable vacuum interface. The vacuum-fiber-fiber coupler (V-FFC) is tested with up to 16 kW sustained laser power and the design is flexible in terms of a wide variety of laser fiber plug systems and vacuum flanges. All that is needed to implement the V-FFC towards an existing or planned vacuum chamber is an aperture of at least 100 mm (4 inch) diameter with any type of vacuum or pressure flange. The V-FFC has a state-of-the-art safety interface which allows for fast fiber breakage detection for both fibers (as supported by fibers) by electric wire breakage and short circuit detection. Moreover, the System also provides connectors for cooling and electric signals for the laser beam optics inside the vacuum. The V-FFC has all necessary adjustment options for coupling the laser radiation to the receiving fiber.

  8. Large Mode Area Photonic Crystal Fibers

    DEFF Research Database (Denmark)

    Nielsen, Martin Dybendal

    2004-01-01

    The photonic crystal fiber (PCF) is a novel single-material optical waveguide realized by an arrangement of air-holes running along the full length of the fiber. Since the proposal of the PCF in 1996, the technology has developed into being a well-established area of research and commercialisation......-mode area fiber optimised for visible light applications. The second is a fiber optimised for the telecommunication band realizing a nonlinear effective area 5 times larger than state of the art conventional fibers. Two examples of alternative designs are demonstrated addressing the core and the cladding...

  9. Construction of Fiber Standardization Demonstration Area to Be Started

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ The China Fiber Inspection Bureau has announced that in 2007 it will reinforce the implementation of science, technologies, and standardization, and begin a project of constructing a fiber standardization demonstration area.

  10. Compact Ultra-Wideband Optical Frequency Comb Fiber Laser Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Based on our success in developing the world first commercial 10 W femtosecond fiber laser system and our leading technology development in ultrashort pulsed fiber...

  11. Technology

    Directory of Open Access Journals (Sweden)

    Xu Jing

    2016-01-01

    Full Text Available The traditional answer card reading method using OMR (Optical Mark Reader, most commonly, OMR special card special use, less versatile, high cost, aiming at the existing problems proposed a method based on pattern recognition of the answer card identification method. Using the method based on Line Segment Detector to detect the tilt of the image, the existence of tilt image rotation correction, and eventually achieve positioning and detection of answers to the answer sheet .Pattern recognition technology for automatic reading, high accuracy, detect faster

  12. Campus fiber optic enterprise networks

    Science.gov (United States)

    Weeks, Richard A.

    1991-02-01

    The proliferation of departmental LANs in campus environments has driven network technology to the point where construction of token ring fiber-optic backbone systems is now a cost-effective alternative. This article will discuss several successful real life case history applications of token ring fiber in a campus setting each with unique distance and load factor requirements. It is hoped that these examples will aid in the understanding planning and implementation of similar installations. It will also attempt to provide important information on the emerging Fiber Distributed Data Interface (FDDI) standard.

  13. Generation of High Purity Photon-Pair in a Short Highly Non-Linear Fiber

    Science.gov (United States)

    2013-01-01

    of entangled photon pairs in optical fiber attracted enormous interest due to its better spatial mode definition and inherent compatibility with...existing fiber optics technologies for long distance transmission, storage and processing. Entangled photon pair generation in optical fiber is...nonlinear microstructure fiber (HNMSF) [7]. In contrast, entangled photon pair generation at telecom wavelengths via SFWM using highly nonlinear fiber

  14. Dietary fiber.

    Science.gov (United States)

    Madar, Z; Thorne, R

    1987-01-01

    Studies done on dietary fiber (DF) over the past five years are presented in this Review. The involvement of dietary fiber in the control of plasma glucose and lipid levels is now established. Two dietary fiber sources (soybean and fenugreek) were studied in our laboratory and are discussed herein. These sources were found to be potentially beneficial in the reduction of plasma glucose in non-insulin dependent diabetes mellitus subjects. They are shown to be acceptable by human subjects and are easy to use either in a mixture of milk products and in cooking. The mechanism by which dietary fiber alters the nutrient absorption is also discussed. The effect of DF on gastric emptying, transit time, adsorption and glucose transport may contribute to reducing plasma glucose and lipid levels. DF was found to be effective in controlling blood glucose and lipid levels of pregnant diabetic women. Dietary fiber may also be potentially beneficial in the reduction of exogenous insulin requirements in these subjects. However, increased consumption of DF may cause adverse side effects; the binding capabilities of fiber may affect nutrient availability, particularly that of minerals and prolonged and high DF dosage supplementation must be regarded cautiously. This is particularly true when recommending such a diet for pregnant or lactating women, children or subjects with nutritional disorders. Physiological effects of DF appear to depend heavily on the source and composition of fiber. Using a combination of DF from a variety of sources may reduce the actual mass of fiber required to obtain the desired metabolic effects and will result in a more palatable diet. Previously observed problems, such as excess flatus, diarrhea and mineral malabsorption would also be minimized.

  15. An accurate, flexible and small optical fiber sensor: a novel technological breakthrough for real-time analysis of dynamic blood flow data in vivo.

    Science.gov (United States)

    Yuan, Qiao-ying; Zhang, Ling; Xiao, Dan; Zhao, Kun; Lin, Chun; Si, Liang-yi

    2014-01-01

    Because of the limitations of existing methods and techniques for directly obtaining real-time blood data, no accurate microflow in vivo real-time analysis method exists. To establish a novel technical platform for real-time in vivo detection and to analyze average blood pressure and other blood flow parameters, a small, accurate, flexible, and nontoxic Fabry-Perot fiber sensor was designed. The carotid sheath was implanted through intubation of the rabbit carotid artery (n = 8), and the blood pressure and other detection data were determined directly through the veins. The fiber detection results were compared with test results obtained using color Doppler ultrasound and a physiological pressure sensor recorder. Pairwise comparisons among the blood pressure results obtained using the three methods indicated that real-time blood pressure information obtained through the fiber sensor technique exhibited better correlation than the data obtained with the other techniques. The highest correlation (correlation coefficient of 0.86) was obtained between the fiber sensor and pressure sensor. The blood pressure values were positively related to the total cholesterol level, low-density lipoprotein level, number of red blood cells, and hemoglobin level, with correlation coefficients of 0.033, 0.129, 0.358, and 0.373, respectively. The blood pressure values had no obvious relationship with the number of white blood cells and high-density lipoprotein and had a negative relationship with triglyceride levels, with a correlation coefficient of -0.031. The average ambulatory blood pressure measured by the fiber sensor exhibited a negative correlation with the quantity of blood platelets (correlation coefficient of -0.839, Preal time; the sensor can also determine the content and status of the blood flow to some extent. Therefore, the fiber sensor can obtain partially real-time vascular rheology information and may thus enable the early diagnosis of blood rheology disorders and

  16. Study on Extraction Technology of Dietary Fiber from Angelica sinensis Residue%当归提取剩余物中提取膳食纤维的工艺研究

    Institute of Scientific and Technical Information of China (English)

    王欢; 周益平; 郭明

    2012-01-01

    The technology for extracting the dietary fiber from Angelica sinensis residue by a combined chemical and enzymatic method was studied. The optimal conditions were obtained by the single factor and orthogonal experiment as follows:alkali concentration 2 %, alkali-hydrolyzable time 2 h, alkali-hydrolyzable temperature 30℃ and particle size 80 mesh. Under these conditions the extracting rate of dietary fiber was 71%, the waterholding capacity of dietary fiber was 2.1g·g-1 and the comprehensive value was 0. 988.%以中药材当归的提取剩余物为研究对象,运用酶-化学结合法制备膳食纤维,并采用单因素实验法与正交实验法结合以选取最优提取工艺:碱处理质量分数为2%、碱处理时间为0.5h、碱处理温度为30℃、粒度为80目,在此条件下得到当归膳食纤维的得率为71%,持水力为2.1g.g-1,其综合得分为0.988。

  17. 光纤激光器接口与光纤总线传输技术研究及案例应用探究%Researching Transmission Technology Based on Fiber Laser Interface and Fiber-optic Bus & Application in Numerical Control system

    Institute of Scientific and Technical Information of China (English)

    吴淇

    2016-01-01

    应用Glink总线,研究了光纤总线与光纤激光器接口之间的传输技术,按照实时性要求使Glink子栈设备控制时序严格同步。在控制光纤激光器接口操作中,本文论述了光纤激光器接口模式和内容,以及光纤总线的传输方式,通过FPGA编程来实现其接口驱动的开发,并在数控系统中加以验证。%ApplingGlinkbus ,tostudytransmission technology between optical bus and fiber laserinterfaces. In accordance with the requirements of real-time control device makes Glink sub-stack strict timing synchronization.In the fiber laser control interface operation, the paper discusses the content and interface mode fiber lasers and the transmission of optical bus, through FPGA programming to achieve its interface-driven development, and verified in the numerical control system.

  18. Fiber-optic sensors for monitoring patient physiological parameters: a review of applicable technologies and relevance to use during magnetic resonance imaging procedures.

    Science.gov (United States)

    Dziuda, Łukasz

    2015-01-01

    The issues involved with recording vital functions in the magnetic resonance imaging (MRI) environment using fiber-optic sensors are considered in this paper. Basic physiological parameters, such as respiration and heart rate, are fundamental for predicting the risk of anxiety, panic, and claustrophobic episodes in patients undergoing MRI examinations. Electronic transducers are generally hazardous to the patient and are prone to erroneous operation in heavily electromagnetically penetrated MRI environments; however, nonmetallic fiber-optic sensors are inherently immune to electromagnetic effects and will be crucial for acquiring the above-mentioned physiological parameters. Forty-seven MRI-tested or potentially MRI-compatible sensors have appeared in the literature over the last 20 years. The author classifies these sensors into several categories and subcategories, depending on the sensing element placement, method of application, and measure and type. The author includes five in-house-designed fiber Bragg grating based sensors and shares experience in acquiring physiological measurements during MRI scans. This paper aims to systematize the knowledge of fiber-optic techniques for recording life functions and to indicate the current directions of development in this area.

  19. Fiber-optic sensors for monitoring patient physiological parameters: a review of applicable technologies and relevance to use during magnetic resonance imaging procedures

    Science.gov (United States)

    Dziuda, Łukasz

    2015-01-01

    The issues involved with recording vital functions in the magnetic resonance imaging (MRI) environment using fiber-optic sensors are considered in this paper. Basic physiological parameters, such as respiration and heart rate, are fundamental for predicting the risk of anxiety, panic, and claustrophobic episodes in patients undergoing MRI examinations. Electronic transducers are generally hazardous to the patient and are prone to erroneous operation in heavily electromagnetically penetrated MRI environments; however, nonmetallic fiber-optic sensors are inherently immune to electromagnetic effects and will be crucial for acquiring the above-mentioned physiological parameters. Forty-seven MRI-tested or potentially MRI-compatible sensors have appeared in the literature over the last 20 years. The author classifies these sensors into several categories and subcategories, depending on the sensing element placement, method of application, and measurand type. The author includes five in-house-designed fiber Bragg grating based sensors and shares experience in acquiring physiological measurements during MRI scans. This paper aims to systematize the knowledge of fiber-optic techniques for recording life functions and to indicate the current directions of development in this area.

  20. An accurate, flexible and small optical fiber sensor: a novel technological breakthrough for real-time analysis of dynamic blood flow data in vivo.

    Directory of Open Access Journals (Sweden)

    Qiao-ying Yuan

    Full Text Available Because of the limitations of existing methods and techniques for directly obtaining real-time blood data, no accurate microflow in vivo real-time analysis method exists. To establish a novel technical platform for real-time in vivo detection and to analyze average blood pressure and other blood flow parameters, a small, accurate, flexible, and nontoxic Fabry-Perot fiber sensor was designed. The carotid sheath was implanted through intubation of the rabbit carotid artery (n = 8, and the blood pressure and other detection data were determined directly through the veins. The fiber detection results were compared with test results obtained using color Doppler ultrasound and a physiological pressure sensor recorder. Pairwise comparisons among the blood pressure results obtained using the three methods indicated that real-time blood pressure information obtained through the fiber sensor technique exhibited better correlation than the data obtained with the other techniques. The highest correlation (correlation coefficient of 0.86 was obtained between the fiber sensor and pressure sensor. The blood pressure values were positively related to the total cholesterol level, low-density lipoprotein level, number of red blood cells, and hemoglobin level, with correlation coefficients of 0.033, 0.129, 0.358, and 0.373, respectively. The blood pressure values had no obvious relationship with the number of white blood cells and high-density lipoprotein and had a negative relationship with triglyceride levels, with a correlation coefficient of -0.031. The average ambulatory blood pressure measured by the fiber sensor exhibited a negative correlation with the quantity of blood platelets (correlation coefficient of -0.839, P<0.05. The novel fiber sensor can thus obtain in vivo blood pressure data accurately, stably, and in real time; the sensor can also determine the content and status of the blood flow to some extent. Therefore, the fiber sensor can obtain

  1. 荞麦皮粉中膳食纤维的制备工艺研究%Study on Extraction Technology of Dietary Fiber from Buckwheat Brans

    Institute of Scientific and Technical Information of China (English)

    杨芙莲; 郭翠翠

    2013-01-01

    Dietary fiber was extracted from buckwheat brans by alkaline hydrolysis method. The optimum extraction condition was found by single-factor and orthogonal experiment, and the properties of dietary fiber were also studied. The results showed that the optimum extraction condition was as follows: the temperature of alkaline hydrolysis 80 ℃, the concentration of NaOH 1.0%, the ratio of material to solution 1:16 (g/mL), and the time of alkaline hydrolysis 80 min. Under these conditions, the yield of dietary fiber was 20.39%. The water holding capacity of insoluble dietary fiber, swelling capacity, and solubility of soluble dietary fiber were 5.97 g/g, 7.4 mL/g and 96%, respectively.%以荞麦皮粉为原料,采用碱法提取膳食纤维,通过单因素及正交试验得出最佳提取工艺条件,并对所得膳食纤维进行性质测定.结果表明,最佳提取工艺条件为:碱解温度80℃,氢氧化钠质量分数1.0%,料液比1∶16(g/mL),碱解时间80 min.在此条件下膳食纤维得率为20.39%,水不溶性膳食纤维持水力为5.97 g/g,膨胀力为7.4 mL/g,水溶性膳食纤维溶解率为96%.

  2. 酶法制备紫红薯膳食纤维的工艺研究%Studies on the Preparation Technology of purple Ipomoea Batatas Dietary Fiber by Enzymatic Method

    Institute of Scientific and Technical Information of China (English)

    吴少福; 侯英梅; 上官新晨; 蒋艳; 沈勇根

    2011-01-01

    为了确定酶法制备紫红薯膳食纤维的最优工艺参数,提高产品纯度,以膳食纤维的膨胀力为指标,采用单因素和正交优化试验对酶法制备紫红薯膳食纤维的工艺进行研究.结果表明,将紫红薯渣按1:10(质量比)用水调成浆,糊化后冷却至75℃,按干薯渣的0.5%加入混合酶[m(淀粉酶):m(糖化酶)=7:3],保温处理150min;灭酶后降温至60℃,按原料的0.2%加入木瓜蛋白酶处理60min.样品的酸性洗涤膳食纤维含量达75.46%.该法为紫红薯膳食纤维的制备提供试验依据.%In order to confirm the optimum technologic parameter of purple Ipomoea Batatas dietary fiber prepared by enzymatic method, improving product purity. To make a target of the dietary fiber expansibility, the technology of purple Ipomoea Batatas dietary fiber enzymatic preparation had been researched with single-factor and orthogonal experiment. The results showed that: 1:10 proportion of purple Ipomoea Batatas dregs to water, mixing enzyme (α-amylase:glucoamylase,7:3) amount to dry basis 0.50%, temperature 75 ℃, time 150 min; after thermal inactivation, pawpaw protease amount to dry basis 0.20%, temperature 60 ℃, time 60min. The content of acid detergent DF in the sample reached to 75.46%. Therefore, this technology of enzymatic preparation may lay the foundation of processing for purple Ipomoea Batatas dietary fiber.

  3. Technological functional properties of soy, oat and wheat fibers and soy products with added fibers and fermented with kefir culturePropriedades funcionais tecnológicas das fibras de soja, aveia e trigo e produtos de soja com adição de fibras e fermentados com cultura de kefir

    Directory of Open Access Journals (Sweden)

    Elza Iouko Ida

    2012-02-01

    Full Text Available The objective of this study was to characterize the technological functional properties of soy, oats and wheat fibers and evaluate soy products with added fiber and fermented with kefir. The fibers were characterized with regard to pH, water adsorption capacity, water and oil absorption capacity and swelling volume. Soy products were developed with the addition of 3% soy fiber, oat and wheat and fermented with kefir. The fermented products were characterized for pH, acidity, syneresis, viscosity and firmness, Lactococcus lactis counts and analysis of sanitary conditions. The soy fiber showed a higher content of protein and lipids, pH, water adsorption and adsorption capacity. The wheat fiber showed a higher oil absorption capacity. The addition of soy, oat and wheat fibers influence pH, acidity, syneresis, viscosity and firmness of fermented soy products with kefir. The lowest syneresis and highest viscosity and firmness were obtained with the soy fermented products with soy fiber. The addition of soy fiber stimulated Lactococcus lactis growth. The fermented soy products had enough Lactococcus lactis counts to be considered probiotics. The products presented satisfactory hygienic sanitary conditions.O objetivo deste trabalho foi caracterizar as propriedades funcionais tecnológicas das fibras de soja, aveia e trigo e avaliar os produtos de soja com adição de fibras e fermentados com cultura de kefir. As fibras foram caracterizadas quanto a composição química, pH, capacidade de adsorção e absorção de água, capacidade de absorção de óleo e volume de intumescimento. Foram desenvolvidos produtos de soja com adição de 3% de fibra de soja, aveia e trigo e fermentados com cultura de kefir. Os produtos fermentados foram caracterizados quanto o pH, acidez, sinerese, viscosidade e firmeza, contagem de Lactococcus lactis e análise das condições higiênico-sanitárias. A fibra de soja apresentou maior teor de proteínas e lipídios, p

  4. Interferometric Fiber Optic Sensors

    Directory of Open Access Journals (Sweden)

    Hae Young Choi

    2012-02-01

    Full Text Available Fiber optic interferometers to sense various physical parameters including temperature, strain, pressure, and refractive index have been widely investigated. They can be categorized into four types: Fabry-Perot, Mach-Zehnder, Michelson, and Sagnac. In this paper, each type of interferometric sensor is reviewed in terms of operating principles, fabrication methods, and application fields. Some specific examples of recently reported interferometeric sensor technologies are presented in detail to show their large potential in practical applications. Some of the simple to fabricate but exceedingly effective Fabry-Perot interferometers, implemented in both extrinsic and intrinsic structures, are discussed. Also, a wide variety of Mach-Zehnder and Michelson interferometric sensors based on photonic crystal fibers are introduced along with their remarkable sensing performances. Finally, the simultaneous multi-parameter sensing capability of a pair of long period fiber grating (LPG is presented in two types of structures; one is the Mach-Zehnder interferometer formed in a double cladding fiber and the other is the highly sensitive Sagnac interferometer cascaded with an LPG pair.

  5. Interferometric fiber optic sensors.

    Science.gov (United States)

    Lee, Byeong Ha; Kim, Young Ho; Park, Kwan Seob; Eom, Joo Beom; Kim, Myoung Jin; Rho, Byung Sup; Choi, Hae Young

    2012-01-01

    Fiber optic interferometers to sense various physical parameters including temperature, strain, pressure, and refractive index have been widely investigated. They can be categorized into four types: Fabry-Perot, Mach-Zehnder, Michelson, and Sagnac. In this paper, each type of interferometric sensor is reviewed in terms of operating principles, fabrication methods, and application fields. Some specific examples of recently reported interferometeric sensor technologies are presented in detail to show their large potential in practical applications. Some of the simple to fabricate but exceedingly effective Fabry-Perot interferometers, implemented in both extrinsic and intrinsic structures, are discussed. Also, a wide variety of Mach-Zehnder and Michelson interferometric sensors based on photonic crystal fibers are introduced along with their remarkable sensing performances. Finally, the simultaneous multi-parameter sensing capability of a pair of long period fiber grating (LPG) is presented in two types of structures; one is the Mach-Zehnder interferometer formed in a double cladding fiber and the other is the highly sensitive Sagnac interferometer cascaded with an LPG pair.

  6. Infrared Fiber Optic Sensors

    Science.gov (United States)

    1997-01-01

    Successive years of Small Business Innovation Research (SBIR) contracts from Langley Research Center to Sensiv Inc., a joint venture between Foster-Miller Inc. and Isorad, Ltd., assisted in the creation of remote fiber optic sensing systems. NASA's SBIR interest in infrared, fiber optic sensor technology was geared to monitoring the curing cycles of advanced composite materials. These funds helped in the fabrication of an infrared, fiber optic sensor to track the molecular vibrational characteristics of a composite part while it is being cured. Foster-Miller ingenuity allowed infrared transmitting optical fibers to combine with Fourier Transform Infrared spectroscopy to enable remote sensing. Sensiv probes operate in the mid-infrared range of the spectrum, although modifications to the instrument also permits its use in the near-infrared region. The Sensiv needle-probe is built to be placed in a liquid or powder and analyze the chemicals in the mixture. Other applications of the probe system include food processing control; combustion control in furnaces; and maintenance problem solving.

  7. Optical Fiber Protection

    Science.gov (United States)

    1999-01-01

    F&S Inc. developed and commercialized fiber optic and microelectromechanical systems- (MEMS) based instrumentation for harsh environments encountered in the aerospace industry. The NASA SBIR programs have provided F&S the funds and the technology to develop ruggedized coatings and coating techniques that are applied during the optical fiber draw process. The F&S optical fiber fabrication facility and developed coating methods enable F&S to manufacture specialty optical fiber with custom designed refractive index profiles and protective or active coatings. F&S has demonstrated sputtered coatings using metals and ceramics and combinations of each, and has also developed techniques to apply thin coatings of specialized polyimides formulated at NASA Langley Research Center. With these capabilities, F&S has produced cost-effective, reliable instrumentation and sensors capable of withstanding temperatures up to 800? C and continues building commercial sales with corporate partners and private funding. More recently, F&S has adapted the same sensing platforms to provide the rapid detection and identification of chemical and biological agents

  8. High-Performance Synthetic Fibers for Composites

    Science.gov (United States)

    1992-04-01

    required wastewater treatment . In short, this new process can easily produce the current standard high-quality precursor fiber, but it also has the...FMI Composites LTD); Formation of fibergLass\\preform for composite coupling shaft; Undulating ribbon structure of graphene layers for a PAN-based c...ongoing research and development in areas that are of general importance to fiber science and technology (surface properties and treatments , fiber-matrix

  9. Laboratory Equipment Type Fiber Optic Refractometer

    OpenAIRE

    E. F. Carome; M. Benca; L. Ovsenik; J. Turan

    2002-01-01

    Using fiber optics and micro optics technologies we designed an innovative fiber optic index of refraction transducer that has unique properties. On the base of this transducer a laboratory equipment type fiber optic refractometer was developed for liquid index of refraction measurements. Such refractometer may be used for medical, pharmaceutical, industrial fluid, petrochemical, plastic, food, and beverage industry applications. For example, it may be used for measuring the concentrations of...

  10. 光纤传感技术在岩土工程安全监测中的应用%Application of optical fiber sensing technology to safety monitoring of geotechnical engineering

    Institute of Scientific and Technical Information of China (English)

    高垠; 马玉华; 李克绵

    2013-01-01

    The optical Fiber Grating sensing technology and its characteristics as well as the technical indexes of FBG ( Fiber Bragg Gratings) sensor and its selection are described in detail herein along with the introduction made on the successful cases of the application of this technology to the safety monitoring of geotechnical engineering construction projects in China.The study result can provide some valuable references for the persons engaged in the design of safety monitoring of geotechnical engineering and the relevant in-situ monitoring.%详细介绍了光纤光栅传感技术及其特点、光纤BFG光栅传感器技术特性指标及选择,给出了光纤传感技术在国内岩土工程安全监测中成功应用的实例.研究结果为从事岩土工程安全监测设计、现场监测的人员提供参考和借鉴.

  11. Soluble vs. insoluble fiber

    Science.gov (United States)

    Insoluble vs. soluble fiber; Fiber - soluble vs. insoluble ... There are 2 different types of fiber -- soluble and insoluble. Both are important for health, digestion, and preventing diseases. Soluble fiber attracts water and turns to gel during digestion. ...

  12. Research Progress of PBO Fiber Heat Treatment Technology and Its Application%PBO纤维热处理技术及其应用研究进展

    Institute of Scientific and Technical Information of China (English)

    朱晓琳; 张鹏; 金子明; 虢忠仁; 钟蔚华; 宫平; 曲志敏

    2016-01-01

    Research on heat-treatment process of PBO fiber,the mechanism of high strength and high modulus of PBO fiber, and the gap between domestic and abroad are reviewed. The domestic PBO fiber is still at the experimental stage in the process of heat treatment,although it can be a small batch of PBO high modulus fiber,but when it is compared with the Toyobo production of Zylon-HM fiber,there is still a gap in strength retention rate,modulus growth rate,performance stability,yield and species models and other aspects. PBO fiber has high strength,high modulus,high thermal resistance and other properties,in the aerospace,defense industry and other fields of reinforced materials,high temperature and anti-ablation materials,has a good application prospects and high market value.%对国内外聚对苯撑苯并双恶唑(PBO)纤维热处理工艺技术、PBO纤维热处理工艺机理研究进展、高模量PBO纤维的性能及应用进行了综述,对比了国内外成果及研究差距。阐明了国内PBO纤维关于热处理工艺研究尚处于试验阶段,虽能够小批量制备PBO高模量纤维,但与Toyobo公司产Zylon-HM纤维相比,在强度保持率、模量增长率、性能稳定性、产量及类型等方面还有差距。PBO纤维具有高强度、高模量、耐高热等性能,在航空航天、国防军工等领域的增强材料、耐高温、耐烧蚀材料之中,具有良好的应用前景和较高的市场价值。

  13. Study on production technology of dry-spinning polyimide fiber%干法纺聚酰亚胺纤维生产技术的研发

    Institute of Scientific and Technical Information of China (English)

    王士华; 苗岭; 陈桃; 张清华

    2013-01-01

    阐述了干法纺聚酰亚胺(PI)纤维生产技术的研究过程、技术方法,并介绍了该纤维的主要特性.综述表明,干法纺PI纤维生产技术是针对湿纺技术生产效率低、成本高、溶剂回收困难等缺点而创新发展的新技术,具有聚合原液国产化制备并可随机调控,纺丝过程的因素可控性,纤维的拉伸、环化过程一体化设计等技术关键点和创新点.其纤维产品有更优异的热稳定性、低温稳定性、永久阻燃性、化学稳定性和电绝缘性.指出干法纺PI纤维生产技术对打破国外技术壁垒,以及对我国高性能纤维产业结构调整和优化升级具有重要战略意义.%The research techniques of manufacturing process of polyimide fibers by dry spinning,as well as the main features of polyimide fibers,are introduced in this paper.Comparing to the disadvantages of wet spinning process,such as low efficiency,high cost,and the difficulty for recovering solvent,the dry spinning process is a facile new technique to overcome these difficulties.The technique for manufacturing spinning dope domestic and adjustable to spinning conditions,along with the controllable spinning process and the continuity design of thermal treatment of curing and hot stretching symbolized a series innovation for manufacturing polyimide fibers.The polyimide fibers produced by dry spinning process possess outstanding high-low temperature stability,perpetual flame retardant properties,fine chemical stability and excellent dielectrical properties.The conclusion of this paper is that the dry spinning technique of polyimide fiber is very important for breaking foreign technique barrier and improving the structure readjustment in high performance fiber industry.

  14. Photovoltaic fibers

    Science.gov (United States)

    Gaudiana, Russell; Eckert, Robert; Cardone, John; Ryan, James; Montello, Alan

    2006-08-01

    It was realized early in the history of Konarka that the ability to produce fibers that generate power from solar energy could be applied to a wide variety of applications where fabrics are utilized currently. These applications include personal items such as jackets, shirts and hats, to architectural uses such as awnings, tents, large covers for cars, trucks and even doomed stadiums, to indoor furnishings such as window blinds, shades and drapes. They may also be used as small fabric patches or fiber bundles for powering or recharging batteries in small sensors. Power generating fabrics for clothing is of particular interest to the military where they would be used in uniforms and body armor where portable power is vital to field operations. In strong sunlight these power generating fabrics could be used as a primary source of energy, or they can be used in either direct sunlight or low light conditions to recharge batteries. Early in 2002, Konarka performed a series of proof-of-concept experiments to demonstrate the feasibility of building a photovoltaic cell using dye-sensitized titania and electrolyte on a metal wire core. The approach taken was based on the sequential coating processes used in making fiber optics, namely, a fiber core, e.g., a metal wire serving as the primary electrode, is passed through a series of vertically aligned coating cups. Each of the cups contains a coating fluid that has a specific function in the photocell. A second wire, used as the counter electrode, is brought into the process prior to entering the final coating cup. The latter contains a photopolymerizable, transparent cladding which hardens when passed through a UV chamber. Upon exiting the UV chamber, the finished PV fiber is spooled. Two hundred of foot lengths of PV fiber have been made using this process. When the fiber is exposed to visible radiation, it generates electrical power. The best efficiency exhibited by these fibers is 6% with an average value in the 4

  15. Templated Chemically Deposited Semiconductor Optical Fiber Materials

    Science.gov (United States)

    Sparks, Justin R.; Sazio, Pier J. A.; Gopalan, Venkatraman; Badding, John V.

    2013-07-01

    Chemical deposition is a powerful technology for fabrication of planar microelectronics. Optical fibers are the dominant platform for telecommunications, and devices such as fiber lasers are forming the basis for new industries. High-pressure chemical vapor deposition (HPCVD) allows for conformal layers and void-free wires of precisely doped crystalline unary and compound semiconductors inside the micro-to-nanoscale-diameter pores of microstructured optical fibers (MOFs). Drawing the fibers to serve as templates into which these semiconductor structures can be fabricated allows for geometric design flexibility that is difficult to achieve with planar fabrication. Seamless coupling of semiconductor optoelectronic and photonic devices with existing fiber infrastructure thus becomes possible, facilitating all-fiber technological approaches. The deposition techniques also allow for a wider range of semiconductor materials compositions to be exploited than is possible by means of preform drawing. Gigahertz bandwidth junction-based fiber devices can be fabricated from doped crystalline semiconductors, for example. Deposition of amorphous hydrogenated silicon, which cannot be drawn, allows for the exploitation of strong nonlinear optical function in fibers. Finally, crystalline compound semiconductor fiber cores hold promise for high-power infrared light-guiding fiber devices and subwavelength-resolution, large-area infrared imaging.

  16. Continuously Developed Acetate Fibers Technology and Market%不断进步中的醋酯纤维技术与市场

    Institute of Scientific and Technical Information of China (English)

    芦长椿

    2012-01-01

    简要介绍了醋酯纤维的特点及近年来醋酯纤维技术的新进展,指出基于国内烟用醋酯丝束市场供需已趋于平衡的现实,开发高档服装用醋酯长丝产品具有可行性.%Acetate fibers from renewable material are mainly applied in two fields of consumption, namely in cigarette filter tow and high-end woman's fashion, evening fashion as well as apparel linings. This article briefly introduces the features of acetate fibers and its new development in recent years. Given the balancing of demand and supply in domestic cigarette filter tow market, the exploitation of acetate yarns products used in high-end fashions shall be feasible.

  17. Modal/涤纶混纺纱上浆工艺研究%Research on Sizing Technology of Modal/Polyester Fiber Blend Yarn

    Institute of Scientific and Technical Information of China (English)

    赵金龙; 沈兰萍; 钱现

    2012-01-01

    根据Modal/涤纶混纺纱性能,制定出4种浆料配方,并对浆液及浆膜性能进行了测试分析.分别采用这4种配方的浆料对Modal/涤纶混纺纱进行浆纱试验,测试了不同配方浆纱的各项性能,从而得:出适合Modal/涤纶混纺纱的浆料配方.%According to the properties of Modal/polyester fiber blend yarn, four kinds of sizing formula were deterimined. Sizing liquors and sizing film were analysed. Four kinds of sizing formula were used to sizing the yarns, then sizing properties and sizing effect were analysed. According to the experimental results, sizing formula that suites for Modal/polyester fiber blend yarn was sure.

  18. Dispersion Management with Higher Order Mode Fibers

    Institute of Scientific and Technical Information of China (English)

    Siddharth Ramachandran

    2003-01-01

    Dispersion compensation with few-mode fibers is emerging as a promising technique that can provide full dispersion and dispersion-slope compensation. The inherent modal path diversity of these fibers allows implementation of static as well as tunable dispersion management schemes. In addition, the low nonlinearityof this technology can improve system OSNR, leading to enhancements in transmission distances.

  19. Dispersion Management with Higher Order Mode Fibers

    Institute of Scientific and Technical Information of China (English)

    Siddharth; Ramachandran

    2003-01-01

    Dispersion compensation with few-mode fibers is emerging as a promising technique that can provide full dispersion and dispersion-slope compensation. The inherent modal path diversity of these fibers allows implementation of static as well as tunable dispersion management schemes. In addition, the low non-linearity of this technology can improve system OSNR, leading to enhancements in transmission distances.

  20. Fiber optic and laser sensors VIII; Proceedings of the Meeting, San Jose, CA, Sept. 17-19, 1990

    Science.gov (United States)

    Depaula, Ramon P. (Editor); Udd, Eric (Editor)

    1991-01-01

    This issue presents topics on the advances in fiber-optic sensor technology, fiber-optic gyroscope, fiber-optic position and pressure sensors, fiber-optic magnetic and temperature sensors, and generic fiber-optic sensors. Papers included are on a novel analog phase tracker for interferometric fiber-optic sensor applications, recent development status of fiber-optic sensors in China, the magnetic-field sensitivity of depolarized fiber-optic gyros, a depolarized fiber-optic gyro for future tactical applications, fiber-optic position transducers for aircraft controls, and a metal embedded optical-fiber pressure sensor. Attention is also given to a fiber-optic magnetic field sensor using spectral modulation encoding, a bare-fiber temperature sensor, an interferometric fiber-optic accelerometer, improvement of specular reflection pyrometer, a theoretical analysis of two-mode elliptical-core optical fiber sensors, and a fiber probe for ring pattern.

  1. An Accurate, Flexible and Small Optical Fiber Sensor: A Novel Technological Breakthrough for Real-Time Analysis of Dynamic Blood Flow Data In Vivo

    OpenAIRE

    Qiao-ying Yuan; Ling Zhang; Dan Xiao,; Kun Zhao; Chun Lin; Liang-yi Si

    2014-01-01

    Because of the limitations of existing methods and techniques for directly obtaining real-time blood data, no accurate microflow in vivo real-time analysis method exists. To establish a novel technical platform for real-time in vivo detection and to analyze average blood pressure and other blood flow parameters, a small, accurate, flexible, and nontoxic Fabry-Perot fiber sensor was designed. The carotid sheath was implanted through intubation of the rabbit carotid artery (n = 8), and the bloo...

  2. Multifunctional Metal/Polymer Composite Fiber for Space Applications Project

    Data.gov (United States)

    National Aeronautics and Space Administration — In this Small Business Innovation Research Phase I Program, Syscom Technology, Inc. (STI) will fabricate a metallized multifunctional composite fiber from a...

  3. CARACTERÍSTICAS DO CAPULHO E PROPRIEDADES TECNOLÓGICAS DA FIBRA DO ALGODOEIRO EM FUNÇÃO DA CALAGEM E DA GESSAGEM BOLLS CHARACTERISTICS AND TECHNOLOGICAL PROPERTIES OF THE COTTON FIBER FACING OF LIMESTONE AND PHOSPHOGYPSUM

    Directory of Open Access Journals (Sweden)

    NELSON PAULIERI SABINO

    1998-01-01

    Full Text Available Em latossolo roxo ácido e de baixa fertilidade do município de Guaíra (SP, desenvolveu-se de 1986/87 a 1989/90 um ensaio de caráter permanente com o algodoeiro para estudar o efeito da aplicação de calcário (0,6; 1,8 e 3,0 t.ha-1 e de gesso (0, 2, 4, 6 t.ha-1 sobre as características do capulho e propriedades tecnológicas da fibra. O delineamento experimental utilizado foi do tipo blocos ao acaso com parcelas subsubdivididas e quatro repetições. O calcário elevou os valores de massa de um capulho e diminuiu o índice Micronaire e a maturidade da fibra, mas não afetou a massa de sementes, a porcentagem, o comprimento, a uniformidade de comprimento e a tenacidade da fibra. O gesso aumentou as massas de capulho e de sementes, especialmente quando associado a maior dose de calcário, assim como o índice Micronaire e a maturidade da fibra, no mais baixo nível de calagem.The effects of limestone and phosphogypsum applications on bolls characteristics and technological properties of the cotton fiber were studied in a permanent trial on a Dystrophic Dusky Latosol, acid and of low fertility during growing seasons of 1986/87 to 1989/90. A randomized complete block design was used, arranged in split split-plots with four replications where the dolomitic limestone doses were the main plots (0.6, 1.8 and 3.0 t.ha-1, and the phosphogypsum doses (0, 2, 4, and 6 t.ha-1 were the subplots. Lime and phosphogypsum were applied in the first year and reaplicated during 1988/89. Liming caused an increase in mass of bolls and reduced the Micronaire index and fiber maturity, and did not affect the mass of seed, the percentage of fiber, the length, the length uniformity and fiber tenacity. The use of phosphogypsum increase the mass of bolls and mass of seed, mainly when associated with extremes doses of lime. Otherwise, its effects upon Micronaire index and fiber maturity values, were significant at low level of liming.

  4. Caracterização tecnológica de caules de quatro variedades de mandioca como fonte de fibras celulósicas para papel Technological characterization of four manioc varieties stem to produce cellulosic fibers for papermaking

    Directory of Open Access Journals (Sweden)

    Anisio Azzini

    1996-01-01

    Full Text Available No presente estudo, procedeu-se à caracterização tecnológica dos caules de quatro variedades de mandioca (Manihot esculenta Crantz - IAC 12.829, Branca de Santa Catarina, Roxinha ou Mico e Fibra - como fonte de fibras celulósicas para a produção de celulose e papel. Os resultados mostraram que os rendimentos em fibras celulósicas dos caules de mandioca variaram de 239,7 a 317,6 g/kg. As variedades Fibra e Branca de Santa Catarina, respectivamente, foram as que apresentaram o menor (18,2 g/kg e o maior (35,0 g/kg teor de fração medular. As frações lenhosas do caule forneceram fibras mais curtas (0,77 a 0,96 mm que as liberianas (1,71 a 2,61 mm. As relações entre as dimensões das fibras indicaram valores adequados à produção de celulose e papel com boas características físico-mecânicas.The technological characterization of stems of four manioc varieties (IAC 12.829, Branca de Santa Catarina, Roxinha or Mico and Fibra were determined, in order to evaluate the cellulosic fibers as raw material for pulp and paper production. The results showed that the cellulosic fiber yields of the cassava stem varied from 239.7 to 317.6 g/kg. The 'Fibra' and 'Branca de Santa Catarina' varieties presented, respectively, the smallest (18.2 g/kg and the highest (35.0 g/kg medullary contents. The cassava stem woody portion supplied cellulosic fibers (0.77 to 0.96 mm shorter than the fibers of the best fraction (1.71 to 2.61 mm. The relation between fiber dimensions pointed out adequate values to produce pulp and paper with good physical and mechanical properties.

  5. Fiber resources

    Science.gov (United States)

    P. J. Ince

    2004-01-01

    In economics, primary inputs or factors of production define the term ‘resources.’ Resources include land resources (plants, animals, and minerals), labor, capital, and entrepreneurship. Almost all pulp and paper fiber resources are plant materials obtained from trees or agricultural crops. These resources encompass plant materials harvested directly from the land (...

  6. Optical fiber communications

    CERN Document Server

    Keiser, Gerd

    2008-01-01

    The fourth edition of this popular text and reference book presents the fundamental principles for understanding and applying optical fiber technology to sophisticated modern telecommunication systems. Optical-fiber-based telecommunication networks have become a major information-transmission-system, with high capacity links encircling the globe in both terrestrial and undersea installations. Numerous passive and active optical devices within these links perform complex transmission and networking functions in the optical domain, such as signal amplification, restoration, routing, and switching. Along with the need to understand the functions of these devices comes the necessity to measure both component and network performance, and to model and stimulate the complex behavior of reliable high-capacity networks.

  7. Architectures of fiber optic network in telecommunications

    Science.gov (United States)

    Vasile, Irina B.; Vasile, Alexandru; Filip, Luminita E.

    2005-08-01

    The operators of telecommunications have targeted their efforts towards realizing applications using broad band fiber optics systems in the access network. Thus, a new concept related to the implementation of fiber optic transmission systems, named FITL (Fiber In The Loop) has appeared. The fiber optic transmission systems have been extensively used for realizing the transport and intercommunication of the public telecommunication network, as well as for assuring the access to the telecommunication systems of the great corporations. Still, the segment of the residential users and small corporations did not benefit on large scale of this technology implementation. For the purpose of defining fiber optic applications, more types of architectures were conceived, like: bus, ring, star, tree. In the case of tree-like networks passive splitters (that"s where the name of PON comes from - Passive Optical Network-), which reduce significantly the costs of the fiber optic access, by separating the costs of the optical electronic components. That's why the passive fiber optics architectures (PON represent a viable solution for realizing the access at the user's loop. The main types of fiber optics architectures included in this work are: FTTC (Fiber To The Curb); FTTB (Fiber To The Building); FTTH (Fiber To The Home).

  8. Pigtail modulation technology of distributed Bragg reflector fiber laser self-mixing interference system%分布式布拉格反射光纤激光器自混合尾纤调制技术

    Institute of Scientific and Technical Information of China (English)

    吴爽; 吕亮

    2016-01-01

    T he laser self‐mixing interference technology is a novel measurement technology , w hich has been widely applied in vibration measurement on account of its distinct advantages of simplicity ,compactness and self‐collimating .In this paper ,the piezoelectric pigtail fiber modulation technology was used to modulate the distributed Bragg reflector fiber laser self‐mixing interference system .Finally ,the reconstruction of external object vibration signal was achieved .The reconstruction results showed that the error of reconstructed vibration signal peak value was less than 0 .3% ,when the external target peak value was in the range of λ/4 to 2λ.%激光自混合干涉技术是一种新型测量技术,其具有结构简单、紧凑、易准直等优点,因而广泛应用于振动测量领域.采用压电陶瓷尾纤调制技术,对分布式布拉格反射光纤激光器自混合干涉系统进行调制,最终实现了对外界物体振动信号的重构.重构结果表明,当外界振动物体峰峰值在λ/4到2λ范围时,重构振动信号的峰峰值误差低于0.3%.

  9. High Power Fiber Lasers and Applications to Manufacturing

    Science.gov (United States)

    Richardson, Martin; McComb, Timothy; Sudesh, Vikas

    2008-09-01

    We summarize recent developments in high power fiber laser technologies and discuss future trends, particularly in their current and future use in manufacturing technologies. We will also describe our current research programs in fiber laser development, ultra-fast and new lasers, and will mention the expectations in these areas for the new Townes Laser Institute. It will focus on new core laser technologies and their applications in medical technologies, advanced manufacturing technologies and defense applications. We will describe a program on large mode area fiber development that includes results with the new gain-guiding approach, as well as high power infra-red fiber lasers. We will review the opportunities for high power fiber lasers in various manufacturing technologies and illustrate this with applications we are pursuing in the areas of femtosecond laser applications, advanced lithographies, and mid-IR technologies.

  10. 1570 nm High Energy Fiber Laser Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This SBIR phase I project proposes a single frequency high energy fiber laser for remote sensing. Current state-of-art technologies can not provide all features of...

  11. Passive and Portable Polymer Optical Fiber Cleaver

    DEFF Research Database (Denmark)

    Saez-Rodriguez, D.; Min, R.; Ortega, B.

    2016-01-01

    Polymer optical fiber (POF) is a growing technology in short distance telecommunication due to its flexibility, easy connectorization, and lower cost than the mostly deployed silica optical fiber technology. Microstructured POFs (mPOFs) have particular promising potential applications in the sens......Polymer optical fiber (POF) is a growing technology in short distance telecommunication due to its flexibility, easy connectorization, and lower cost than the mostly deployed silica optical fiber technology. Microstructured POFs (mPOFs) have particular promising potential applications...... opening up the possibility of an electrically passive cleaver. In this letter, we describe the implementation and testing of a high quality cleaver based on a mechanical system formed by a constant force spring and a damper, which leads to the first reported electrical passive and portable cleaver....

  12. Developing Accurate Spatial Maps of Cotton Fiber Quality Parameters

    Science.gov (United States)

    Awareness of the importance of cotton fiber quality (Gossypium, L. sps.) has increased as advances in spinning technology require better quality cotton fiber. Recent advances in geospatial information sciences allow an improved ability to study the extent and causes of spatial variability in fiber p...

  13. All-optical, Three-axis Fiber Laser Magnetometer

    Science.gov (United States)

    2012-04-16

    E-1 1.  INTRODUCTION ...achieved with other magnetic field sensing technologies such as those based on flux gates and fiber optic magnetostrictive sensors. The deployed...ALL-OPTICAL, THREE-AXIS FIBER LASER MAGNETOMETER 1. INTRODUCTION This report describes the development of an undersea fiber optic magnetometer

  14. Multiparameter fiber sensors: enabling new capabilities in production optimization

    NARCIS (Netherlands)

    Cheng, L.K.; Boering, M.; Braal, F.M.

    2014-01-01

    Fiber optic data transmission already has led to revolutionary developments, and ongoing research in fiber optic sensing technology for applications in extreme operational conditions will boost the development of fiber optic multipleparameter sensing systems further. Such innovations will be of part

  15. Sport Technology

    CSIR Research Space (South Africa)

    Kirkbride, T

    2007-11-01

    Full Text Available in design and manufacturing to virtual reality. There are carbon fiber materials used and in performance analysis that use video base technology. In the 1999 cricket World Cup, small earphones were used for Hansie to communicate with the coach and were later...

  16. Fiber Optics: Deregulate and Deploy.

    Science.gov (United States)

    Suwinski, Jan H.

    1993-01-01

    Describes fiber optic technology, explains its use in education and commercial settings, and recommends regulations and legislation that will speed its use to create broadband information networks. Topics discussed include distance learning; interactive video; costs; and the roles of policy makers, lawmakers, public advocacy groups, and consumers.…

  17. Investigation on the biological enzyme degumming technology combined with chemical method on hemp fiber%汉麻纤维的生物酶与化学法联合脱胶工艺的研究

    Institute of Scientific and Technical Information of China (English)

    赵欣; 赵彦松; 罗晶琨

    2015-01-01

    采用酸性果胶酶和木聚糖酶复配对汉麻纤维进行前处理后,再使用氢氧化钠传统方法对汉麻纤维进行二次脱胶,分析了酶用量、时间、温度、pH和二次脱胶时氢氧化钠用量对煮练效果的影响,并确定最佳工艺条件为:酸性果胶酶9%(omf),木聚糖酶12%(omf),时间120 min,温度50℃,pH=4.6,二次脱胶时使用6 g/L氢氧化钠.与传统煮练法漂白后的大麻纤维相比,联合脱胶漂白后纤维的白度基本保持不变,但后者的失重率、断裂强力和残胶率却均优于前者.%Hemp fibers pretreated with acid pectinase and xylanase were degummed once again with the traditional sodium hydroxide. The influences of the amount of enzyme, treating time and temperature, pH and the dosage of sodium hydroxide in the second degumming on scouring effect were analyzed, and the opti-mum technological conditions were determined as the amount of pectinase was 9%(omf), xylanase dosage was 12%(omf), the time was 120 min, the temperature was 50 ℃, pH was 4.6 and the concentration of sodi-um hydroxide in second degumming was 6 g/L. Compared with bleached hemp fibers with traditional scouring method, the whiteness of the bleached hemp fibers with combined method remain nearly unchanged, the weight loss rate, breaking strength and the residual gum rate was better.

  18. Cashmere fiber accused of wet a performance improvement technology research%羊绒纤维控湿性有苣改善技木的研究

    Institute of Scientific and Technical Information of China (English)

    徐筱; 高巧燕; 邢建伟

    2012-01-01

    羊绒由于其特殊的结构,决定了其在不同的温度和湿度条件下容易吸湿和放湿,最终造成羊绒质量稳定性差,本次实验就是为了减小其质量随着温度和湿度的改变而改变的幅度,减少羊绒在运输过程中的质量损失,增强其质量稳定性。实验通过改变助剂的用量,改变助剂处理温度及处理时间,以及调节湿度等来检测对羊绒处理过后的控湿效果。实验的目的是在不影响羊绒纤维的手感和强力、强度的基础上改善羊绒纤维的回潮率和控湿效果。%Cashmere because of its special structure, determined its easy moisture absorption and desorption at different temperature and humidity, finally result in its poor stability, this exploration experiment is to reduce the extent of quality changes along with the temperature and humidity changes, reduce the mass loss of cashmere during transportation, and enhance its quality stability.The auxiliaries we used in this experiment is self-made, we mainly detect the humidity controlling spinning of cashmere after treatment using auxiliary through changes in their dosage, changing the treatment temperature and processing time of auxiliary ,and adjust humidity.The purpose of this experiment is to improve moisture regain, humidity controlling effect of cashmere fiber on the bases of not affect the feel of cashmere fiber, strengthl and the intensity of cashmere fiber.

  19. Nonlinear analysis of nano-cluster doped fiber

    Institute of Scientific and Technical Information of China (English)

    LIU Gang; ZHANG Ru

    2007-01-01

    There are prominent nonlinear characteristics that we hope for the semiconductor nano-clusters doped fiber. Refractive index of fiber core can be effectively changed by adulteration. This technology can provide a new method for developing photons components. Because the semiconductor nano-cluster has quantum characteristics,Based on first-order perturbation theory and classical theory of fiber,we deduced refractive index expressions of fiber core,which was semiconductor nano-cluster doped fiber. Finally,third-order nonlinear coefficient equation was gained. Using this equation,we calculated SMF-28 fiber nonlinear coefficient. The equation shows that new third-order coefficient was greater.

  20. Optical fiber sensors fabricated by the focused ion beam technique

    DEFF Research Database (Denmark)

    Yuan, Scott Wu; Wang, Fei; Bang, Ole

    2012-01-01

    crystal fiber (PCF). Using this technique we fabricate a highly compact fiber-optic Fabry-Pérot (FP) refractive index sensor near the tip of fiber taper, and a highly sensitive in-line temperature sensor in PCF. We also demonstrate the potential of using FIB to selectively fill functional fluid......Focused ion beam (FIB) is a highly versatile technique which helps to enable next generation of lab-on-fiber sensor technologies. In this paper, we demonstrate the use application of FIB to precisely mill the fiber taper and end facet of both conventional single mode fiber (SMF) and photonic...

  1. Technological Status of Man-Made Fiber Laboratory and Pilot Plant%化学纤维实验室与中间试验设备的技术现状

    Institute of Scientific and Technical Information of China (English)

    芦长椿

    2011-01-01

    The commonly-used lab scale spintester, i.e., laboratory and pilot plant suitable for dry spinning,wet spinning and melt spinning are specifically introduced. The spintester includes testing units such as small-scale drawing twister, false-twist drawing texturing machine and industrial yarn unit which are applied for enhancing process, developing new products and reducing the energy consumption. Recently,new pilot plants are emerging in the research of high-performance fiber material which, to some extent,accelerates the renewal speed in man-made fiber technologies.%重点介绍了常用的试验规模的纺丝设备,即采用干法、湿法和熔融法的实验室和中间试验纺丝装置,包括企业为优化生产工艺、开发新产品、降低能耗所配备的诸如小型拉伸机、拉伸变形机、工业丝试验单元等.

  2. In-Line Fiber Optic Interferometric Sensors in Single-Mode Fibers

    Directory of Open Access Journals (Sweden)

    De-Wen Duan

    2012-08-01

    Full Text Available In-line fiber optic interferometers have attracted intensive attention for their potential sensing applications in refractive index, temperature, pressure and strain measurement, etc. Typical in-line fiber-optic interferometers are of two types: Fabry-Perot interferometers and core-cladding-mode interferometers. It’s known that the in-line fiber optic interferometers based on single-mode fibers can exhibit compact structures, easy fabrication and low cost. In this paper, we review two kinds of typical in-line fiber optic interferometers formed in single-mode fibers fabricated with different post-processing techniques. Also, some recently reported specific technologies for fabricating such fiber optic interferometers are presented.

  3. 谈钢纤维混凝土耐磨地坪施工技术%Discussion on construction technology of steel-fiber-concrete wear-resisting floor

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    Taking the warehouse floor construction project of Qingxu logistic center of Shanxi Meet All as an example,through analyzing its actual conditions,the paper applies steel-fiber-concrete wear-resisting floor construction technology,specifically introduces its construction technology procedures,and illustrates critical construction technologies and control points,with a view to guarantee the construction quality.%以山西美特好清徐物流中心的库房地坪施工项目为例,通过对该项目实际情况的分析,采用钢纤维耐磨混凝土超平地坪施工技术,并对该施工技术的具体工艺流程进行了详细介绍,说明了施工过程中应把握的关键技术及控制要点,以确保施工质量。

  4. 综述路桥施工技术中钢纤维混凝土技术的使用%The Technology of Steel Fiber Reinforced Concrete in Road and Bridge Construction

    Institute of Scientific and Technical Information of China (English)

    邓强

    2014-01-01

    对于路桥施工而言,混凝土质量对于路桥结构的强度与力学性能有着直接的影响。将钢纤维混凝土技术应用在路桥施工中,能够提升施工质量的安全性与可靠性,这对路桥工程的良性发展有着十分积极的效用。%The quality of concrete has a direct effect on the strength and mechanical property of road and bridge structure. Applying the technology of steel fiber reinforced concrete in road bridge construction can effectively improve the safety and reliability of the construction quality, which has a very positive effect on the development of road and bridge engineering.

  5. Fiber optic evanescent wave biosensor

    Science.gov (United States)

    Duveneck, Gert L.; Ehrat, Markus; Widmer, H. M.

    1991-09-01

    The role of modern analytical chemistry is not restricted to quality control and environmental surveillance, but has been extended to process control using on-line analytical techniques. Besides industrial applications, highly specific, ultra-sensitive biochemical analysis becomes increasingly important as a diagnostic tool, both in central clinical laboratories and in the doctor's office. Fiber optic sensor technology can fulfill many of the requirements for both types of applications. As an example, the experimental arrangement of a fiber optic sensor for biochemical affinity assays is presented. The evanescent electromagnetic field, associated with a light ray guided in an optical fiber, is used for the excitation of luminescence labels attached to the biomolecules in solution to be analyzed. Due to the small penetration depth of the evanescent field into the medium, the generation of luminescence is restricted to the close proximity of the fiber, where, e.g., the luminescent analyte molecules combine with their affinity partners, which are immobilized on the fiber. Both cw- and pulsed light excitation can be used in evanescent wave sensor technology, enabling the on-line observation of an affinity assay on a macroscopic time scale (seconds and minutes), as well as on a microscopic, molecular time scale (nanoseconds or microseconds).

  6. Research on Processing Technology of Glass Fiber Reinforced Thermoplastic Resin Matrix Interlayer Composites%纤维增强热塑性树脂基夹层复合材料加工工艺研究

    Institute of Scientific and Technical Information of China (English)

    邹积洋; 孙开颜; 李军; 任万杰

    2015-01-01

    Glass fiber reinforced thermoplastic resin matrix interlayer composite which uses ethylene-vinyl acetate copolymer(EVAC) thermoplastic resin reinforced glass fiber as matrix material,and the alumina ceramicsas interlayer has the characteristics of high toughness in surface,high hardness and high brittleness in the interlayer. To meet the precision of machining process,the quality requirement of the product surface and the requirements of machining processing schedule at the same time, it is difficult to process all kinds of angles and holes. Aiming to solve the difficulties in the processing technology of the glass fiber reinforced thermoplastic resin matrix interlayer composites,the choice of machines,knife tools and the processing parameters, as well as the determination of process quality are researched. Meanwhile,the equipment specifications,blade diameter,the relationship between cutting speed and the thickness of the glass fiber reinforced thermoplastic resin matrix interlayer composite are all determined. The determination method of process quality is given by the section quality,size precision and the surface quality and other aspects.%采用玻纤增强乙烯–乙酸乙烯酯共聚物(EVAC)复合材料为基体材料,以氧化铝陶瓷为夹层材料,制备的纤维增强热塑性树脂基夹层复合材料具有表面韧性好,夹层硬度高、脆性大的特点,在同时满足纤维增强热塑性树脂基夹层复合材料加工精度、加工面质量和加工进度要求的条件下,各类角、孔的加工难度很大。针对此类复合材料的加工难点,从设备和刀具的选择、工艺参数的选定、工艺质量的判定等几个方面对复合材料的加工工艺进行了研究,确定了设备规格、刀具外径、切割进刀速度与复合材料厚度关系等关键参数,并从断面质量、尺寸精度、表面质量等方面给出了工艺质量的判定方法。

  7. A Survey on Key Technologies for Carbon Fiber-reinforced Plastics with Applications to Automobile Lightening%面向汽车轻量化应用的碳纤维复合材料关键技术

    Institute of Scientific and Technical Information of China (English)

    宋燕利; 杨龙; 郭巍; 华林

    2016-01-01

    轻量化技术已成为汽车实现节能、减排的重要途径,碳纤维复合材料为汽车轻量化提供了重要材料基础。由于材料特性与制造工艺的特殊性与复杂性,采用碳纤维复合材料实现汽车轻量化时需要克服多项关键技术。结合汽车产品特点,从低成本碳纤维技术、材料-结构-性能一体化技术、高效成型技术、多材料连接技术、循环利用技术几个方面阐述了碳纤维复合材料在汽车轻量化应用中的关键技术,展望了未来汽车用碳纤维复合材料的发展趋势。%Lightweight has become an important way to achieve energy saving and emission reduction for auto-mobile and carbon fiber-reinforced plastics (CFRP)has provided a significant material foundation for automobile ligh-tening.Due to particularity and complexity of material properties and manufacturing processes,the application of CFRP to vehicle lightening still faces several crucial technological challenges.In this paper,the key technologies aimed at these issues,including low cost carbon fiber,structure-function integration,highly efficient molding,multi-mate-rial connection,and recycling,are analyzed and summarized combining with the automobile features.The future de-velopment prospect of CFRP for automobile application is also put forward.

  8. 植被恢复用植生卷材制造技术及其应用%Manufacture Technology of Vegetative Blanket of Natural Fiber for Revegetation and Its Use

    Institute of Scientific and Technical Information of China (English)

    郭文静; 赵平; 王正; 范留芬

    2011-01-01

    综述以植物纤维为主要原料的复合植生卷材在边坡绿化中的应用优势,介绍复合植生卷材的特点以及以无纺布或纸、农作物秸秆、木纤维为主要原料的不同复合植生卷材的制造技术及其特点,概述复合植生卷材的国内外技术发展应用状况,并提出复合植生卷材在植被恢复和边坡绿化等领域的应用前景及其在我国生态环境综合治理中低碳加工、循环利用的新思路。%The application advantages of vegetative blanket made from natural fiber in slope vegetation were summarized. Both the characteristics of compounded vegetative blanket as well as the manufacture technology and characteristics of different types of compounded vegetative blanket made from paper or nonwoven fabrics, crop stalks and wood fiber respectively were described. The technology development and application of compounded vegetative blanket at home and abroad were also reviewed. Finally, the paper prospected the application of compounded vegetative blanket in revegetation and slope vegetation, and proposed the new thought that corapounded vegetative blanket can be used in China's eological environment improvement to achieve low-carbon and recycling use.

  9. 一种便携式大气激光通信系统设计与实现%Research on atmosphere laser communication system based on fiber technology

    Institute of Scientific and Technical Information of China (English)

    曾文锋; 李东; 李申鹏; 谭威; 易志刚

    2012-01-01

    设计了一种以光纤技术为核心的大气激光通信系统,采用半导体激光器和PIN接收管收发合一的以太网端机和视、音频端机,并分别用光纤与光学天线连接,实现了端机与光学天线之间的软性连接,结合EDFA光纤放大技术实现对1550 nm半导体激光器的功率放大,使结构稳定可靠,安装调试方便,适于野外环境使用,通信距离可达2 km,传输带宽100 MBit/s,样机试验证明通信效果良好.%A kind of atmosphere laser communication system with fiber technology as its core is designed. Ethernet terminal and video-audio terminal with transceiver composed of semiconductor laser and PIN are used. They are connected to the optical antenna with fiber,so the flexible connection between terminal machine and optical antenna is realized. By EDFA technology,the power of the 1550 nm semiconductor laser is amplified. The scheme and structure of the system make it to be more steady and reliable and the installation is more convenient. It is suitable for field application. A prototype's communication distance reaches 2 kilometers and the transmission bandwidth is 100 Mbit/s. Experiments prove that the performance of the system is quite good.

  10. Tunable photonic bandgap fiber based devices for optical networks

    DEFF Research Database (Denmark)

    Alkeskjold, Thomas Tanggaard; Scolari, Lara; Rottwitt, Karsten

    2005-01-01

    In future all optical networks one of the enabling technologies is tunable elements including reconfigurable routers, switches etc. Thus, the development of a technology platform that allows construction of tuning components is critical. Lately, microstructured optical fibers, filled with liquid...

  11. Fiber optics principles and practices

    CERN Document Server

    Al-Azzawi, Abdul

    2007-01-01

    Since the invention of the laser, our fascination with the photon has led to one of the most dynamic and rapidly growing fields of technology. New advances in fiber optic devices, components, and materials make it more important than ever to stay current. Comprising chapters drawn from the author's highly anticipated book Photonics: Principles and Practices, Fiber Optics: Principles and Practices offers a detailed and focused treatment for anyone in need of authoritative information on this critical area underlying photonics.Using a consistent approach, the author leads you step-by-step throug

  12. Patterned functional carbon fibers from polyethylene

    Energy Technology Data Exchange (ETDEWEB)

    Hunt, Marcus A [ORNL; Saito, Tomonori [ORNL; Brown, Rebecca H [ORNL; Kumbhar, Amar S [University of North Carolina, Chapel Hill; Naskar, Amit K [ORNL

    2012-01-01

    Patterned, continuous carbon fibers with controlled surface geometry were produced from a novel melt-processible carbon precursor. This portends the use of a unique technique to produce such technologically innovative fibers in large volume for important applications. The novelties of this technique include ease of designing and fabricating fibers with customized surface contour, the ability to manipulate filament diameter from submicron scale to a couple of orders of magnitude larger scale, and the amenable porosity gradient across the carbon wall by diffusion controlled functionalization of precursor. The geometry of fiber cross-section was tailored by using bicomponent melt-spinning with shaped dies and controlling the melt-processing of the precursor polymer. Circular, trilobal, gear-shaped hollow fibers, and solid star-shaped carbon fibers of 0.5 - 20 um diameters, either in self-assembled bundle form, or non-bonded loose filament form, were produced by carbonizing functionalized-polyethylene fibers. Prior to carbonization, melt-spun fibers were converted to a char-forming mass by optimizing the sulfonation on polyethylene macromolecules. The fibers exhibited distinctly ordered carbon morphologies at the outside skin compared to the inner surface or fiber core. Such order in carbon microstructure can be further tuned by altering processing parameters. Partially sulfonated polyethylene-derived hollow carbon fibers exhibit 2-10 fold surface area (50-500 m2/g) compared to the solid fibers (10-25 m2/g) with pore sizes closer to the inside diameter of the filaments larger than the sizes on the outer layer. These specially functionalized carbon fibers hold promise for extraordinary performance improvements when used, for example, as composite reinforcements, catalyst support media, membranes for gas separation, CO2 sorbents, and active electrodes and current collectors for energy storage applications.

  13. Green Fiber Bottle

    DEFF Research Database (Denmark)

    Didone, Mattia; Tosello, Guido

    their impact on the environment, especially the oceans. For example, the life span of a plastic bottle in the ocean is 500 years, and during its degradation, the plastic is reduced to micro pieces, which causes the starvation of several marine animals. The new bottle is completely made from molded paper pulp...... technologies, the manufacturing technology for the production of the bottle has to offer the possibility of significant energy savings. Molded pulp products are made from wood fibers dispersed in water, and then they are formed, drained and dried. A relatively large quantity of resources (i.e. energy and time......) is consumed during the drying process. It is in this process stage that an innovative way of drying the products can be exploited by using the concept of impulse drying. Impulse drying is an advance drying technique in which water is removed from a wet paper pulp by the combination of mechanical pressure...

  14. Noninvasive blood pressure measurement scheme based on optical fiber sensor

    Science.gov (United States)

    Liu, Xianxuan; Yuan, Xueguang; Zhang, Yangan

    2016-10-01

    Optical fiber sensing has many advantages, such as volume small, light quality, low loss, strong in anti-jamming. Since the invention of the optical fiber sensing technology in 1977, optical fiber sensing technology has been applied in the military, national defense, aerospace, industrial, medical and other fields in recent years, and made a great contribution to parameter measurement in the environment under the limited condition .With the rapid development of computer, network system, the intelligent optical fiber sensing technology, the sensor technology, the combination of computer and communication technology , the detection, diagnosis and analysis can be automatically and efficiently completed. In this work, we proposed a noninvasive blood pressure detection and analysis scheme which uses optical fiber sensor. Optical fiber sensing system mainly includes the light source, optical fiber, optical detector, optical modulator, the signal processing module and so on. wavelength optical signals were led into the optical fiber sensor and the signals reflected by the human body surface were detected. By comparing actual testing data with the data got by traditional way to measure the blood pressure we can establish models for predicting the blood pressure and achieve noninvasive blood pressure measurement by using spectrum analysis technology. Blood pressure measurement method based on optical fiber sensing system is faster and more convenient than traditional way, and it can get accurate analysis results in a shorter period of time than before, so it can efficiently reduce the time cost and manpower cost.

  15. Photonic Bandgap Fibers

    DEFF Research Database (Denmark)

    Barkou, Stig Eigil; Broeng, Jes; Bjarklev, Anders Overgaard

    1999-01-01

    Photonic bandgap fibers are describes using a new Kagomé cladding structure. These fibers may potentially guide light in low-index regions. Such fibers offer new dispersion properties, and large design flexibility.......Photonic bandgap fibers are describes using a new Kagomé cladding structure. These fibers may potentially guide light in low-index regions. Such fibers offer new dispersion properties, and large design flexibility....

  16. Broadband Wireline Provider Service: Optical Carrier - Fiber to the End User; BBRI_fiber12

    Data.gov (United States)

    University of Rhode Island Geospatial Extension Program — This dataset represents the availability of wireline broadband Internet access in Rhode Island via "Optical Carrier - Fiber to the End User" technology. Broadband...

  17. Technology Transfer/Commercialization Report

    Science.gov (United States)

    2002-01-01

    Contents include the following: (1) Who we are. (2) Technology opportunities and successes in 2002: Hilbert-Huang transform; new sensors via sol-gel-filled fiber optics; hierarchical segmentation software. (3) Activities in 2002: encouraging researcher involvement; inventorying new technologies; patenting Goddard technologies; promoting Goddard technologies; establishing new agreements;seeking and bestowing awards. (4) How to reach Goddard's: technology commercialization office.

  18. Technology Transfer/Commercialization Report

    Science.gov (United States)

    2002-01-01

    Contents include the following: (1) Who we are. (2) Technology opportunities and successes in 2002: Hilbert-Huang transform; new sensors via sol-gel-filled fiber optics; hierarchical segmentation software. (3) Activities in 2002: encouraging researcher involvement; inventorying new technologies; patenting Goddard technologies; promoting Goddard technologies; establishing new agreements;seeking and bestowing awards. (4) How to reach Goddard's: technology commercialization office.

  19. All-Fiber Raman Probe

    DEFF Research Database (Denmark)

    Brunetti, Anna Chiara

    The design and development of an all-in-fiber probe for Raman spectroscopy are presented in this Thesis. Raman spectroscopy is an optical technique able to probe a sample based on the inelastic scattering of monochromatic light. Due to its high specificity and reliability and to the possibility...... to perform real-time measurements with little or no sample preparation, Raman spectroscopy is now considered an invaluable analytical tool, finding application in several fields including medicine, defense and process control. When combined with fiber optics technology, Raman spectroscopy allows...... for the realization of flexible and minimally-invasive devices, able to reach remote or hardly accessible samples, and to perform in-situ analyses in hazardous environments. The work behind this Thesis focuses on the proof-of-principle demonstration of a truly in-fiber Raman probe, where all parts are realized...

  20. Research and Technology 1980

    Science.gov (United States)

    1980-01-01

    Topics are divided into three major areas: Earth resources, advanced development, and technology transfer. Topics include: aerial color infrared photography, fiber optics, lightning research, soil mechanics, corrosion prevention, image processing, and communication systems development.

  1. 曲线拟合技术在无线光纤振动传感器的研究%Research on Wireless Fiber Brag Grating Vibration Sensor Based on Curve Simulating Technology

    Institute of Scientific and Technical Information of China (English)

    吴皓莹

    2009-01-01

    无线光纤光栅振动传感器在未来桥梁及大型基础设施健康监测中有着广泛的应用前景,如何降低能耗是亟待解决的问题.采用曲线拟合技术,可以提取振动波形的特征参数,从而有效降低数据在无线传输中的能耗.通过模拟仿真实验,上述方法可以很好地实现数据压缩,并保证数据传输的准确性.%Wireless Fiber Brag Grating Vibration Sensor will play an important role in the deployment of next-generation,health-monitoring systems for bridges and civil infrastructures. The key problem is how to save energy on wireless data transmi-tion. By using the technology of curve simulating, eigan parameter can be extracted in order to save the energy exhausted in da-ta transmition. Simulating experiment results show that the proposed technology realizes data compression and preserves the presicion of data.

  2. Characterizing Cellulosic Fibers from Ulex europaeus

    Directory of Open Access Journals (Sweden)

    Richard Celis

    2014-10-01

    Full Text Available Information on the morphological and physical properties of biofibers is necessary to support the mechanical understanding of the biological design of plants, as well as for the development of new technology that adds value to non-traditional bioresources, such as those based on Ulex europaeus fibers. Ulex europaeus fibers were extracted through a chemical pulping process at 170 °C and with 40 g/L NaOH. The dimensions of the fibers produced were 0.97 ± 0.1 mm in length and 13 ± 2 μm in diameter. Pressed fiber paper sheets were made to evaluate their mechanical properties. Burst and tear indices of 1.2 mN/kg and 8.6 Nm2/kg, respectively, were recorded. The values obtained did not compare well to fiber paper sheets from Pinus radiata, presumably due to the significant amount of non-structural elements of wood present in the samples and the lower length of Ulex europaeus fibers, which resulted in lower tensile strength. Additionally, nanoindentation tests were conducted to assess the hardness and elastic modulus of the fibers, obtaining average values of 0.84 GPa and 9.23 GPa for the stem, respectively. These values were significantly lower than those of industrial biofiber, perhaps due to the lower morphogenic maturity of Ulex europaeus fibers compared to other traditional sources of fiber.

  3. Nickel(II) removal by mixtures of Acorga M5640 and DP8R in pseudo-emulsion based hollow fiber with strip dispersion technology.

    Science.gov (United States)

    Gonzalez, R; Cerpa, A; Alguacil, F J

    2010-11-01

    This work presents the investigation of Ni(II) extraction from aqueous solution through pseudo-emulsion based hollow fiber strip dispersion (PSEHFSD) containing the mixture 2-hydroxy-5-nonylbenzaldehyde oxime+di(2-ethylhexyl) phosphoric acid/Exxsol D100 as extractant in the form of a pseudo-emulsion with H₂SO₄. The organic and aqueous strip phases are separated when the stirring device is stopped. The permeation of Ni(II) is investigated as a function of various experimental variables: hydrodynamic conditions, feed pH, extractants mixture concentration in the pseudo-emulsion, initial Ni(II) concentration in feed phase, H₂SO₄ concentration in the pseudo-emulsion as strippant. In PEHFSD, pseudo-emulsion is an emulsion that is formed temporarily between organic and stripping solutions. In this investigation, feed was circulated through the lumen side in counter-current mode. The selectivity of 2-hydroxy-5-nonylbenzaldehyde oxime+di(2-ethylhexyl) phosphoric acid/Exxsol D100 based PEHFSD toward different metals was also examined. Copyright © 2010 Elsevier Ltd. All rights reserved.

  4. 新材料技术在腈纶厂反应釜上的应用%New Material Technological improvement of acrylic fiber reactor

    Institute of Scientific and Technical Information of China (English)

    胡卫东

    2016-01-01

    文中对影响腈纶反应釜长周期运转的因素进行了分析,指出结疤是影响装置长周期运转主要原因。采用铝材制成的聚合釜,有较高的电极电位,介质中的杂质会产生一个微电池,使聚合物颗粒不易粘附在聚合釜上,避免了釜内结疤。%This paper made analysis to the factors influencing long period running of acrylic fiber reactor,and pointed out that the scarring is the main reason influencing long period running of the plant. By using polymerization reactor made of aluminum which has higher electrode potential,impurities in medium can generate a microbattery,made polymer granules not easy to adhere to polymerization reactor and prevented scarring in side the reactor.

  5. 麻秆芯纤维发泡缓冲包装材料的制备工艺%Manufacturing Technology of Foaming Buffer Packaging Material Prepared from Cannabis sativa Core Fiber

    Institute of Scientific and Technical Information of China (English)

    何蕊; 陈太安; 戈应仓

    2011-01-01

    利用大麻秆芯纤维为植物纤维原料制备缓冲包装材料,探讨麻秆芯纤维添加量、胶黏剂、发泡剂和填料4个工艺因素对发泡体性能的影响,并利用外观特征、密度和回弹率3个性能指标对发泡体进行综合评价,筛选出的优化工艺条件为:麻秆芯纤维添加量为30.0%,胶黏剂用量为20.0%,发泡剂用量为1.5%,填料用量为10.0%.优化工艺条件下制备的发泡材料外观量化评分为9,密度为0.151//cm3,回弹率为3.22%,初步达到缓冲包装材料的要求.%The foaming buffer packaging material was experimented to be made of the Cannabis sativa stem core fiber. The influence of the proportion of four major raw material components i. e. , the amount of C. sativa stem core fiber, glue dosage, dosage of foaming agent and the additive dosage applied, upon the properties of foaming material was studied, and the properties of the foaming material were comprehensively evaluated with appearance, bulk density and shape recovery rate indexes. The results showed that the optimized raw material proportionfor the processing was 30. 0% of fiber, 20. 0% of glue, 1. 5% of foaming agent and 10. 0% of additive. The foaming buffer packaging material manufactured by the optimized processing technology was assessed that the appearance was scored as 9 points, the bulk density was 0. 151 g/cm3 and the shape recovery rate was 3. 22% , indicating that the foaming material could be used as buffer packaging material.

  6. Continuous Fiber Ceramic Composites (CFCC)

    Energy Technology Data Exchange (ETDEWEB)

    R. A. Wagner

    2002-12-18

    This report summarizes work to develop CFCC's for various applications in the Industries of the Future (IOF) and power generation areas. Performance requirements range from relatively modest for hot gas filters to severe for turbine combustor liners and infrared burners. The McDermott Technology Inc. (MTI) CFCC program focused on oxide/oxide composite systems because they are known to be stable in the application environments of interest. The work is broadly focused on dense and porous composite systems depending on the specific application. Dense composites were targeted at corrosion resistant components, molten aluminum handling components and gas turbine combustor liners. The development work on dense composites led to significant advances in fiber coatings for oxide fibers and matrix densification. Additionally, a one-step fabrication process was developed to produce low cost composite components. The program also supported key developments in advanced oxide fibers that resulted in an improved version of Nextel 610 fiber (commercially available as Nextel 650) and significant progress in the development of a YAG/alumina fiber. Porous composite development focused on the vacuum winding process used to produce hot gas filters and infrared burner components.

  7. Biosensing with optical fiber gratings

    Directory of Open Access Journals (Sweden)

    Chiavaioli Francesco

    2017-06-01

    Full Text Available Optical fiber gratings (OFGs, especially long-period gratings (LPGs and etched or tilted fiber Bragg gratings (FBGs, are playing an increasing role in the chemical and biochemical sensing based on the measurement of a surface refractive index (RI change through a label-free configuration. In these devices, the electric field evanescent wave at the fiber/surrounding medium interface changes its optical properties (i.e. intensity and wavelength as a result of the RI variation due to the interaction between a biological recognition layer deposited over the fiber and the analyte under investigation. The use of OFG-based technology platforms takes the advantages of optical fiber peculiarities, which are hardly offered by the other sensing systems, such as compactness, lightness, high compatibility with optoelectronic devices (both sources and detectors, and multiplexing and remote measurement capability as the signal is spectrally modulated. During the last decade, the growing request in practical applications pushed the technology behind the OFG-based sensors over its limits by means of the deposition of thin film overlays, nanocoatings, and nanostructures, in general. Here, we review efforts toward utilizing these nanomaterials as coatings for high-performance and low-detection limit devices. Moreover, we review the recent development in OFG-based biosensing and identify some of the key challenges for practical applications. While high-performance metrics are starting to be achieved experimentally, there are still open questions pertaining to an effective and reliable detection of small molecules, possibly up to single molecule, sensing in vivo and multi-target detection using OFG-based technology platforms.

  8. 非织造工艺对天然纤维增强体树脂流动性能的影响%EFFECT OF NON-WOVEN TECHNOLOGY ON RESIN FLOW CHARACTER FOR NATURAL FIBER REINFORCEMENT

    Institute of Scientific and Technical Information of China (English)

    薛道顺; 周红涛; 胡红

    2011-01-01

    The resin flow character of fibrous reinforcement is an important factor to the design of resin flow process and the mechanical property of the final product. This paper investigated the effect of non-woven technology on resin flow character for flax fiber non-woven reinforcement. The results show that the flax non-woven reinforcement manufactured by parallel-laid technology has lower permeability but higher flow anisotropy than that of nonwoven reinforcement manufactured by cross-laid technology under the same vacuum pressure. With the increasing of reinforcement layers and vacuum pressures, the permeability decreases; the change of vacuum pressure has no obvious influence on flow anisotropy.%纤维增强体的树脂流动性能是影响树脂传递模塑工艺设计及其复合材料质量的一个重要因素.本文利用单向法测试真空辅助传递模塑工艺中非织造工艺对亚麻纤维增强体对树脂流动性能的影响.结果表明,相同压力条件下,由平行铺网工艺制作的纤维增强体比交叉铺网工艺增强体树脂渗透率低,流动各项异性大;随着层数的增加及压力的增大,两种铺网工艺增强体的树脂渗透率降低,压力的变化对流动各向异性影响不大.

  9. Activities to investigate wavelength-shifting optical fibers

    Science.gov (United States)

    Anderson, Megan; Strong, Denver; Baker, Blane

    2017-07-01

    Understanding principles and operation of optical fibers is important for students of physics due to increased applications of fiber optics in today’s technological world. In an effort to devise new activities to study such fibers, we obtained samples of wavelength-shifting WLS optical fibers, used in construction of research-grade particle detectors. Qualitative experiments in our laboratories examined how these fibers interact with various colors of visible light. From these results, student activities were developed to increase critical thinking in introductory physics courses and to facilitate students’ progression from traditional-classroom to research-oriented settings.

  10. Overview of advanced components for fiber optic systems

    Science.gov (United States)

    Depaula, Ramon P.; Stowe, David W.

    1986-01-01

    The basic operating principles and potential performance of several state-of-the-art fiber-optic devices are illustrated with diagrams and briefly characterized. Technologies examined include high-birefringence polarization-maintaining fibers and directional couplers, single-mode fiber polarizers and cut-off polarizers, optical-fiber modulators with radially poled piezoactive polymer (PVF2) jackets, and piezoelectric-squeezer polarization modulators. The need for improved manufacturing techniques to make such fiber-optic devices cost-competitive with their thin-film integrated-optics analogs is indicated.

  11. Photonic crystal fibers

    DEFF Research Database (Denmark)

    Lægsgaard, Jesper; Hansen, K P; Nielsen, M D;

    2003-01-01

    Photonic crystal fibers having a complex microstructure in the transverse plane constitute a new and promising class of optical fibers. Such fibers can either guide light through total internal reflection or the photonic bandgap effect, In this paper, we review the different types and applications...... of photonic crystal fibers with particular emphasis on recent advances in the field....

  12. Photonic crystal fibers -

    DEFF Research Database (Denmark)

    Libori, Stig E. Barkou

    2002-01-01

    During this ph.d. work, attention has been focused on understanding and analyzing the modal behavior of micro-structured fibers. Micro-structured fibers are fibers with a complex dielectric toplogy, and offer a number of novel possibilities, compared to standard silica based optical fibers. The t...

  13. Photonic Crystal Fiber Attenuator

    Institute of Scientific and Technical Information of China (English)

    Joo; Beom; Eom; Hokyung; Kim; Jinchae; Kim; Un-Chul; Paek; Byeong; Ha; Lee

    2003-01-01

    We propose a novel fiber attenuator based on photonic crystal fibers. The difference in the modal field diameters of a conventional single mode fiber and a photonic crystal fiber was used. A variable optical attenuator was also achieved by applying macro-bending on the PCF part of the proposed attenuator

  14. Efficient Tm-Fiber-Pumped Ho:YLF Laser System for Coherent LIDAR Applications Project

    Data.gov (United States)

    National Aeronautics and Space Administration — We propose to employ a recently developed, efficient, high-power, heavily-doped Tm:silica-fiber technology as a high-gain fiber pre-amplifier and as a...

  15. 77 FR 65713 - Certain Optoelectronic Devices for Fiber Optic Communications, Components Thereof, and Products...

    Science.gov (United States)

    2012-10-30

    ... COMMISSION Certain Optoelectronic Devices for Fiber Optic Communications, Components Thereof, and Products... Singapore; and Avago Technologies U.S. Inc. of San Jose, California. Letters supplementing the complaint... the United States after importation of certain optoelectronic devices for fiber optic...

  16. Industrial production of enzyme-modified wool fibers for machine-washable bed coverings

    NARCIS (Netherlands)

    Lenting, H.B.M.; Broekman, H.; Guebitz, G.M.; Kokol, V.; Shen, J.

    2009-01-01

    Enzyme technology is explored on wool fibers to prevent shrinkage and consolidation behavior during washing of woolen bed coverings using normal household machine conditions. Enzyme modification of wool fibers after two different pretreatments has been realized on industrial scale. Enlarged

  17. 基于耦合技术的单色光谱吸收法检测甲烷气体浓度%Based on the Optical fiber coupling technology of spectral absorption method to detect methane gas concentration

    Institute of Scientific and Technical Information of China (English)

    姜建国; 刘盈萱; 王源

    2014-01-01

    In allusion to flammable and explosive safety problems of electronic testing equipment in methane gas concentration and adjustable laser expensive prices, put forward an application of coupling technique of mono-chromatic spectrum tests to detect methane gas concentration. The choice of monochromatic light source is given based on, designed a monochromatic spectrum absorption detection device based on optical fiber coupling technolo-gy. Application of Matlab is proposed for methane gas concentration and two sets of data output voltage linear fit-ting. Through the output voltage to predict methane gas concentration, and exam the error of the predicted values and the real value. The experimental results show that optical fiber coupling technology was applied to monochromatic spectrum absorption method to detect methane gas concentration can be without power in real-time detection of methane gas concentration, error less than 2%.%针对电子检测装置在甲烷气体浓度检测时存在易燃易爆等安全隐患,本文提出了一种基于光纤耦合技术的单色光谱吸收法检测甲烷气体浓度的方案。给出了单色光源的选择依据,设计了基于光纤耦合技术的单色光谱吸收法检测装置,提出了应用Matlab对甲烷气体浓度与输出电压两组数据进行线性拟合。通过输出电压预测出甲烷气体浓度,并检测了预测值与真实值的误差。实验结果表明,将光纤耦合技术应用于单色光谱吸收法检测甲烷气体浓度,可以在无电力介入的情况下对甲烷气体浓度进行实时检测,误差不超过2%。

  18. 光纤网络在通讯工程技术中的应用%Application of Optical Fiber Network in Telecommunications Engineering Technology

    Institute of Scientific and Technical Information of China (English)

    王林

    2015-01-01

    光纤网络的诞生和发展是电信史上的一次重要革命,因其具有抗干扰、速率快、容量大的特点,利用光纤的信息传递优势可以最大限度的提高资源利用效率,因此光纤通信改变了传统的通信方式。随着光纤网络在通讯工程技术中的广泛应用,与之配合的网络基础技术也随之发展起来,其已经渗入到有线通信的多个领域,成为现代通信的主力军,对社会生活的影响日益深刻。展望将来的通信行业,光纤网络技术具有不可限量的潜力。因此,研究光纤网络在通讯工程技术中的应用具有十分重要的现实意义。%The birth and development of optical network is an important revolution in the history of telecommunications, because of its advantages of anti-jamming, speed and large capacity optical ifber characteristics, using the advantage of information transmission can improve efifciency and maximum utilization of resources, so the optical ifber communication has changed the traditional way of communication. With the wide application of optical ifber network in telecommunications engineering technology in the basic technology and network matching has been developed, which has penetrated into many ifelds of wire communication, become the main force of modern communication, more profound inlfuence on social life. The prospect of the communications industry in the future, optical ifber network technology has limitless potential. Therefore, has the extremely important practical signiifcance in the application research of optical ifber network communication technology in engineering.

  19. Preparation of zeolite covered cellulose fibers

    Energy Technology Data Exchange (ETDEWEB)

    Mintova, S.; Valtchev, V. [Institute of Applied Mineralogy, Sofia (Bulgaria)

    1995-12-01

    Membrane separation has proved to be an important technology in chemical industry. That is why the design of different type of zeolite containing membranes has received much attention during the last decade. Zeolite containing filters and membranes were prepared by embedding zeolite crystals with adhesive substances in the cellulose matrix. This communication discussed the preparation of zeolite containing cellulose materials by in situ crystallization. Discussed axe: (1) the effect of the vegetal fiber structure and chemical composition (2) the effect of the type of the zeolite coating; (3) the effect of the mechanical and chemical treatment of the fibers on the process of the fiber zeolite coating.

  20. Laboratory Equipment Type Fiber Optic Refractometer

    Directory of Open Access Journals (Sweden)

    E. F. Carome

    2002-09-01

    Full Text Available Using fiber optics and micro optics technologies we designed aninnovative fiber optic index of refraction transducer that has uniqueproperties. On the base of this transducer a laboratory equipment typefiber optic refractometer was developed for liquid index of refractionmeasurements. Such refractometer may be used for medical,pharmaceutical, industrial fluid, petrochemical, plastic, food, andbeverage industry applications. For example, it may be used formeasuring the concentrations of aqueous solutions: as the concentrationor density of a solute increase, the refractive index increasesproportionately. The paper describes development work related to designof laboratory type fiber optic refractometer and describes experimentsto evaluation of its basic properties.

  1. Manufacturing Technology of Bamboo-Fiber Based Composites Used as Container Flooring%集装箱底板用竹基纤维复合制造技术

    Institute of Scientific and Technical Information of China (English)

    余养伦; 孟凡丹; 于文吉

    2013-01-01

    The bamboo-based fiber composite container flooring was made of bamboo fibrous veneer, where a series of dotted and/or linear shaped cracks were formed on the cylinder wall of a semicircular bamboo tube so as to form a netty structural bamboo fibrous veneer which was composed of interlaced fiber bundles, using the moso bamboo and D. 0. bamboo as raw material and phenolic-formaldehyde as adhesive and then was contrasted and analyzed with traditional container flooring such as Apitong plywood, bamboo-wood composite plywood and sliver plybamboo. The results show that the physical and mechanical properties of bamboo-based fiber composites can meet or exceed the requirement of the plywood for container flooring reference to the national standard GB/T 19536-2004 without moving the outer and inner layer of bamboo through the rational structure and process design. The properties of bamboo-fiber based composites exceed that of Apitong plywood, bamboo-wood composite plywood and sliver plybamboo. The split bamboo tube is fluffed directly to make the bamboo fibrous veneer with the outer and inner layer of bamboo, which change the traditional component units structure of bamboo-based panel such as bamboo strips and bamboo sliver, so that the unavailable big-sized cluster bamboo in the existing technology can be fully used, and the process is easier, and the production efficiency is higher.%以毛竹和绿竹为原料,酚醛树脂为胶黏剂,采用点裂和线裂纤维分离技术,将半圆竹筒分离形成由竹纤维束组成的网状结构的纤维化单板,经过工艺和结构设计,制造竹基纤维复合集装箱底板,并与传统阿必通、竹木和竹篾全竹集装箱底板的性能进行对比分析.结果表明:在不去竹青和竹黄的条件下,采用合理的结构和工艺制造的竹基纤维复合材料,性能达到或超过GB/T 19536-2004《集装箱底板用胶合板》标准规定的各项指标要求,其综合性能超过传统阿必通、竹木和

  2. Honeywell FLASH fiber optic motherboard evaluations

    Science.gov (United States)

    Stange, Kent

    1996-10-01

    The use of fiber optic data transmission media can make significant contributions in achieving increasing performance and reduced life cycle cost requirements placed on commercial and military transport aircraft. For complete end-to-end fiber optic transmission, photonics technologies and techniques need to be understood and applied internally to the aircraft line replaceable units as well as externally on the interconnecting aircraft cable plant. During a portion of the Honeywell contribution to Task 2A on the Fly- by-Light Advanced System Hardware program, evaluations were done on a fiber optic transmission media implementation internal to a Primary Flight Control Computer (PFCC). The PFCC internal fiber optic transmission media implementation included a fiber optic backplane, an optical card-edge connector, and an optical source/detector coupler/installation. The performance of these optical media components were evaluated over typical aircraft environmental stresses of temperature, vibration, and humidity. These optical media components represent key technologies to the computer end-to-end fiber optic transmission capability on commercial and military transport aircraft. The evaluations and technical readiness assessments of these technologies will enable better perspectives on productization of fly-by-light systems requiring their utilizations.

  3. Research for Electronic Fiber Optics Technologists

    Science.gov (United States)

    Lawrence, Ellis E.

    1999-01-01

    The intent of this project was to provide research experiences for socially and economically disadvantaged students in networking via fiber optics. The objectives of this project were: 1) To provide knowledge and skills needed by students to use the tools and equipment essential to networking NASA's and the university's topologies; 2) To provide the student researchers with needed mathematical skills and concepts to progress in fiber optic technology; 3) To afford the principal investigator an opportunity to become certified in fiber optics; 4) To build a transmitter and receiver circuit that will be linked by fiber-optic cable to demonstrate mastery of concepts; and 5) To conduct research for NASA and the University in the fiber-optic system. The research will attempt to develop applications for THUNDER (Thin-layer Composite Unimorph Ferroelectric Driver and Sensor) and LARC-SI (Langley Research Center- Soluble Polyimide), (inventions at NASA/LaRC) and fiber-optic technology that will be beneficial to NASA, the university and the consumer. This research has the potential of improving the nation's manpower in the area of fiberoptic technology. It will allow students the opportunity to participate in visible research at NASA and in industry.

  4. Distributed radiofrequency signal processing using multicore fibers

    Science.gov (United States)

    Garcia, S.; Gasulla, I.

    2016-11-01

    Next generation fiber-wireless communication paradigms will require new technologies to address the current limitations to massive capacity, connectivity and flexibility. Multicore optical fibers, which were conceived for high-capacity digital communications, can bring numerous advantages to fiber-wireless radio access architectures. Besides radio over fiber parallel distribution and multiple antenna connectivity, multicore fibers can implement, at the same time, a variety of broadband processing functionalities for microwave and millimeter-wave signals. This approach leads to the novel concept of "fiber-distributed signal processing". In particular, we capitalize on the spatial parallelism inherent to multicore fibers to implement a broadband tunable true time delay line, which is the basis of multiple processing applications such as signal filtering, arbitrary waveform generation and squint-free radio beamsteering. We present the design of trench-assisted heterogeneous multicore fibers composed of cores featuring individual spectral group delays and chromatic dispersion profiles. Besides fulfilling the requirements for true time delay line operation, the MCFs are optimized in terms of higher-order dispersion, crosstalk and bend sensitivity. Microwave photonics signal processing will benefit from the performance stability, 2D operation versatility and compactness brought by the reported fiberintegrated solution.

  5. Fiber transport of spatially entangled photons

    Science.gov (United States)

    Löffler, W.; Eliel, E. R.; Woerdman, J. P.; Euser, T. G.; Scharrer, M.; Russell, P.

    2012-03-01

    High-dimensional entangled photons pairs are interesting for quantum information and cryptography: Compared to the well-known 2D polarization case, the stronger non-local quantum correlations could improve noise resistance or security, and the larger amount of information per photon increases the available bandwidth. One implementation is to use entanglement in the spatial degree of freedom of twin photons created by spontaneous parametric down-conversion, which is equivalent to orbital angular momentum entanglement, this has been proven to be an excellent model system. The use of optical fiber technology for distribution of such photons has only very recently been practically demonstrated and is of fundamental and applied interest. It poses a big challenge compared to the established time and frequency domain methods: For spatially entangled photons, fiber transport requires the use of multimode fibers, and mode coupling and intermodal dispersion therein must be minimized not to destroy the spatial quantum correlations. We demonstrate that these shortcomings of conventional multimode fibers can be overcome by using a hollow-core photonic crystal fiber, which follows the paradigm to mimic free-space transport as good as possible, and are able to confirm entanglement of the fiber-transported photons. Fiber transport of spatially entangled photons is largely unexplored yet, therefore we discuss the main complications, the interplay of intermodal dispersion and mode mixing, the influence of external stress and core deformations, and consider the pros and cons of various fiber types.

  6. Fiber optic hydrogen sensor

    Energy Technology Data Exchange (ETDEWEB)

    Butler, M.A.; Sanchez, R.; Dulleck, G.R.

    1996-05-01

    This report covers the development of fiber optic hydrogen and temperature sensors for monitoring dissolved hydrogen gas in transformer oil. The concentration of hydrogen gas is a measure of the corona and spark discharge within the transformer and reflects the state of health of the transformer. Key features of the instrument include use of palladium alloys to enhance hydrogen sensitivity, a microprocessor controlled instrument with RS-232, liquid crystal readout, and 4-20 ma. current loop interfaces. Calibration data for both sensors can be down loaded to the instrument through the RS-232 interface. This project was supported by the Technology Transfer Initiative in collaboration with J. W. Harley, Inc. through the mechanism of a cooperative research and development agreement (CRADA).

  7. 分布式光纤油气长输管道泄漏检测及预警技术%Distributed fiber oil and gas pipeline leak detection and warning technology

    Institute of Scientific and Technical Information of China (English)

    张富斌

    2015-01-01

    管道用于油气运输有着独特的优势,因此成为了运输油气的主要手段。在实际油气的运输过程中因为人为因素和自然因素等原因,经常会导致运输油气的管道发生泄漏事故,这不仅造成环境污染,而且会威胁到人们的生命财产安全。本文介绍了分布式光纤油气长输管道泄漏检测及预警技术在油田的应用。%For oil and gas transportation pipeline has a unique advantage, it became the primary means of transportation of oil and gas. In the actual transportation of oil and gas, man-made and natural factors and other reasons often resulted the transport of oil and gas pipeline leak accident, which not only affected environmental pollution, but also threatened people’s life and property safety.This article introduced distributed fiber oil and gas pipeline leak detection and warning technology.

  8. Optical Fiber Sensing System of Methane Based on Harmonic Detection Technology%基于谐波检测的新型光纤甲烷传感系统

    Institute of Scientific and Technical Information of China (English)

    宋鹏; 李奉泽; 刘鉴

    2011-01-01

    基于谐波检测技术,设计了一种高性能的光纤甲烷传感系统.采用大功率的DFBID光源补偿弱吸收的缺点,选用自聚焦气室消除光源干涉噪声,提高光路耦合效率,实现远距传输;设计模拟与数字相结合的锁相放大电路,相敏检波用高度集成的芯片AD360实现,采用最佳调制频率.通过实验证明,本系统实现了对甲烷气体稳定快速高精度的实时遥测.%Based on harmonic detection technology, a high-performance fiber-optic methane sensing system is designed. Using high-power light source DFBLD for compensation of weak absorption, and choosing self-focusing chamber to eliminate interference noise source, the optical coupling efficiency is improved, the long-distance transmission is achieved. A lock amplifier of analog and digital combination is designed, the phase sensitive detection is realized with highly integrated chip AD360, and the best modulation frequency is used to improve SNR. The experimental results show that the system can realize the stable, rapid and accurate real-time telemetry for the methane gas.

  9. Amplitude-modulated fiber-ring laser

    DEFF Research Database (Denmark)

    Caputo, J. G.; Clausen, Carl A. Balslev; Sørensen, Mads Peter

    2000-01-01

    Soliton pulses generated by a fiber-ring laser are investigated by numerical simulation and perturbation methods. The mathematical modeling is based on the nonlinear Schrödinger equation with perturbative terms. We show that active mode locking with an amplitude modulator leads to a self-starting......Soliton pulses generated by a fiber-ring laser are investigated by numerical simulation and perturbation methods. The mathematical modeling is based on the nonlinear Schrödinger equation with perturbative terms. We show that active mode locking with an amplitude modulator leads to a self......-starting of stable solitonic pulses from small random noise, provided the modulation depth is small. The perturbative analysis leads to a nonlinear coupled return map for the amplitude, phase, and position of the soliton pulses circulating in the fiber-ring laser. We established the validity of this approach...

  10. Amplitude-modulated fiber-ring laser

    DEFF Research Database (Denmark)

    Caputo, J. G.; Clausen, Carl A. Balslev; Sørensen, Mads Peter

    2000-01-01

    Soliton pulses generated by a fiber-ring laser are investigated by numerical simulation and perturbation methods. The mathematical modeling is based on the nonlinear Schrödinger equation with perturbative terms. We show that active mode locking with an amplitude modulator leads to a self-starting......Soliton pulses generated by a fiber-ring laser are investigated by numerical simulation and perturbation methods. The mathematical modeling is based on the nonlinear Schrödinger equation with perturbative terms. We show that active mode locking with an amplitude modulator leads to a self......-starting of stable solitonic pulses from small random noise, provided the modulation depth is small. The perturbative analysis leads to a nonlinear coupled return map for the amplitude, phase, and position of the soliton pulses circulating in the fiber-ring laser. We established the validity of this approach...

  11. Optical Fiber Fusion Splicing

    CERN Document Server

    Yablon, Andrew D

    2005-01-01

    This book is an up-to-date treatment of optical fiber fusion splicing incorporating all the recent innovations in the field. It provides a toolbox of general strategies and specific techniques that the reader can apply when optimizing fusion splices between novel fibers. It specifically addresses considerations important for fusion splicing of contemporary specialty fibers including dispersion compensating fiber, erbium-doped gain fiber, polarization maintaining fiber, and microstructured fiber. Finally, it discusses the future of optical fiber fusion splicing including silica and non-silica based optical fibers as well as the trend toward increasing automation. Whilst serving as a self-contained reference work, abundant citations from the technical literature will enable readers to readily locate primary sources.

  12. Optical Sensors Based on Plastic Fibers

    Science.gov (United States)

    Bilro, Lúcia; Alberto, Nélia; Pinto, João L.; Nogueira, Rogério

    2012-01-01

    The recent advances of polymer technology allowed the introduction of plastic optical fiber in sensor design. The advantages of optical metrology with plastic optical fiber have attracted the attention of the scientific community, as they allow the development of low-cost or cost competitive systems compared with conventional technologies. In this paper, the current state of the art of plastic optical fiber technology will be reviewed, namely its main characteristics and sensing advantages. Several measurement techniques will be described, with a strong focus on interrogation approaches based on intensity variation in transmission and reflection. The potential applications involving structural health monitoring, medicine, environment and the biological and chemical area are also presented. PMID:23112707

  13. Optical Sensors Based on Plastic Fibers

    Directory of Open Access Journals (Sweden)

    Rogério Nogueira

    2012-09-01

    Full Text Available The recent advances of polymer technology allowed the introduction of plastic optical fiber in sensor design. The advantages of optical metrology with plastic optical fiber have attracted the attention of the scientific community, as they allow the development of low-cost or cost competitive systems compared with conventional technologies. In this paper, the current state of the art of plastic optical fiber technology will be reviewed, namely its main characteristics and sensing advantages. Several measurement techniques will be described, with a strong focus on interrogation approaches based on intensity variation in transmission and reflection. The potential applications involving structural health monitoring, medicine, environment and the biological and chemical area are also presented.

  14. ASSESMENT OF SELF HEALING PROPERTY IN HYBRID FIBER POLYMERIC COMPOSITE

    Directory of Open Access Journals (Sweden)

    N.ABILASH

    2011-07-01

    Full Text Available In recent years, Natural fiber reinforced composites is an emerging area in polymer technology. Fibers resulting from plants are considered a budding substitute for non-renewable synthetic fibers like glass and carbon fibers. The objective of this study is to merge the benefits of natural and synthetic fibers by developing ahybrid composite of jute and glass fibers along with self healing property to eliminate delamination without compromising the benefits of hybridization. This concept offers the designer an ability to incorporate secondary functional ability of counteracting service degradation in addition to achieving the primary, usually structuralintegrity, requirement. The self-healing approach utilizes a releasable healing agent contained in a hollow fiber that is embedded in a resin system. Specimens are produced using a hollow glass fiber and epoxy resin. In addition, in the case of multiple fibers test, e-glass fibers are incorporated in the composite. When a crack isinitiated and propagates through the composite breaking the hollow fiber, a liquid healing agent comes out and fills the crack gap. Polymerization of the monomer healing agent is facilitated when it contacts a catalyst that is pre-coated on the outside surface of the hollow glass fiber. Self-healing materials also have the benefit ofoffering lighter and optimized structures as well as reduced maintenance cost.

  15. Microstructured fibers for high power applications

    Science.gov (United States)

    Baggett, J. C.; Petrovich, M. N.; Hayes, J. R.; Finazzi, V.; Poletti, F.; Amezcua, R.; Broderick, N. G. R.; Richardson, D. J.; Monro, T. M.; Salter, P. L.; Proudley, G.; O'Driscoll, E. J.

    2005-10-01

    Fiber delivery of intense laser radiation is important for a broad range of application sectors, from medicine through to industrial laser processing of materials, and offers many practical system design and usage benefits relative to free space solutions. Optical fibers for high power transmission applications need to offer low optical nonlinearity and high damage thresholds. Single-mode guidance is also often a fundamental requirement for the many applications in which good beam quality is critical. In recent years, microstructured fiber technology has revolutionized the dynamic field of optical fibers, bringing with them a wide range of novel optical properties. These fibers, in which the cladding region is peppered with many small air holes, are separated into two distinct categories, defined by the way in which they guide light: (1) index-guiding holey fibers (HFs), in which the core is solid and light is guided by a modified form of total internal reflection, and (2) photonic band-gap fibers (PBGFs) in which guidance in a hollow core can be achieved via photonic band-gap effects. Both of these microstructured fiber types offer attractive qualities for beam delivery applications. For example, using HF technology, large-mode-area, pure silica fibers with robust single-mode guidance over broad wavelength ranges can be routinely fabricated. In addition, the ability to guide light in an air-core within PBGFs presents obvious power handling advantages. In this paper we review the fundamentals and current status of high power, high brightness, beam delivery in HFs and PBGFs, and speculate as to future prospects.

  16. Fiber design and realization of point-by-point written fiber Bragg gratings in polymer optical fibers

    Science.gov (United States)

    Stefani, Alessio; Stecher, Matthias; Town, Graham E.; Bang, Ole

    2012-04-01

    An increasing interest in making sensors based on fiber Bragg gratings (FBGs) written in polymer optical fibers (POFs) has been seen recently. Mostly microstructured POFs (mPOFs) have been chosen for this purpose because they are easier to fabricate compared, for example, to step index fibers and because they allow to tune the guiding parameters by modifying the microstructure. Now a days the only technique used to write gratings in such fibers is the phase mask technique with UV light illumination. Despite the good results that have been obtained, a limited flexibility on the grating design and the very long times required for the writing of FBGs raise some questions about the possibility of exporting POF FBGs and the sensors based on them from the laboratory bench to the mass production market. The possibility of arbitrary design of fiber Bragg gratings and the very short time required to write the gratings make the point-by-point grating writing technique very interesting and would appear to be able to fill this technological gap. On the other end this technique is hardly applicable for microstructured fibers because of the writing beam being scattered by the air-holes. We report on the design and realization of a microstructured polymer optical fiber made of PMMA for direct writing of FBGs. The fiber was designed specifically to avoid obstruction of the writing beam by air-holes. The realized fiber has been used to point-by-point write a 5 mm long fourth order FBG with a Bragg wavelength of 1518 nm. The grating was inspected under Differential Interferometric Contrast microscope and the reflection spectrum was measured. This is, to the best of our knowledge, the first FBGs written into a mPOF with the point-by-point technique and also the fastest ever written into a polymer optical fiber, with less than 2.5 seconds needed.

  17. Modal instabilities in very large mode area rod fiber amplifiers

    DEFF Research Database (Denmark)

    Jørgensen, Mette Marie; Hansen, Kristian Rymann; Laurila, Marko

    large core fiber areas are highly desirable to mitigate various nonlinear processes, such as Kerr, four-wave mixing, Raman, and Brillouin effects. It is difficult to scale up the core area without going into a multi-moded regime. Microstructured fiber technology has allowed core diameters of 60...... to modal instability [3-5], represented in Fig. 2 as the growth of the higher order mode content. This is a fundamental obstacle for power scaling in fiber amplifiers that significantly reduces beam quality and stability. We combine analytic considerations for thermally induced mode coupling...... with the finite element method to allow complex micro structured fibers to be considered. Thereby the modal instability threshold is estimated for very large mode area fiber amplifiers of various photonic crystal fiber designs. Experimentally the modal instability threshold for very large mode area fiber...

  18. Learning from history: Adaptive calibration of 'tilting spine' fiber positioners

    CERN Document Server

    Gilbert, James

    2015-01-01

    This paper discusses a new approach for determining the calibration parameters of independently-actuated optical fibers in multi-object astronomical fiber positioning systems. This work comes from the development of a new type of piezoelectric motor intended to enhance the 'tilting spine' fiber positioning technology originally created by the Australian Astronomical Observatory. Testing has shown that the motor's performance can vary depending on the fiber's location within its accessible field, meaning that an individual fiber is difficult calibrate with a one-time routine. Better performance has resulted from constantly updating calibration parameters based on the observed movements of the fiber during normal closed-loop positioning. Over time, location-specific historical data is amassed that can be used to better predict the results of a future fiber movement. This is similar to a technique previously proposed by the Australian Astronomical Observatory, but with the addition of location-specific learning....

  19. Topological one-way fiber of second Chern number

    CERN Document Server

    Lu, Ling

    2016-01-01

    Optical fiber is a ubiquitous and indispensable component in communications, sensing, biomedicine and many other lightwave technologies and applications. Here we propose topological one-way fibers to remove two fundamental mechanisms that limit fiber performance: scattering and reflection. We design three-dimensional~(3D) photonic crystal fibers, inside which photons propagate only in one direction, that are completely immune to Rayleigh and Mie scatterings and significantly suppress the nonlinear Brillouin and Raman scatterings. A one-way fiber is also free from Fresnel reflection, naturally eliminating the needs for fiber isolators. Our finding is enabled by the recently discovered Weyl points in a double-gyroid~(DG) photonic crystal. By annihilating two Weyl points by supercell modulation in a magnetic DG, we obtain the photonic analogue of the 3D quantum Hall phase with a non-zero first Chern number~($C_1$). When the modulation becomes helixes, one-way fiber modes develop along the winding axis, with the ...

  20. 从织物弹性考查PTT/PET双组分长丝的制造技术%Study on Spinning Technology of PTT/PET Bi-Component Fiber from Fabric Elasticity

    Institute of Scientific and Technical Information of China (English)

    焦守业; 王府梅

    2011-01-01

    This article intends to investigate spinning technology of PTT (polytrimethylene terephthalate)/ PET (polyethlene terephthalate) bicomponent composite fiber more accurately from the aspect of fabric elasticity, which can provide guidance to the production. Two series of testing samples are weaved and tested, one called Zifangsi fabric, the other one called Qiyezhongshisi fabric. There are 18 kinds of samples. The effects of four main spinning parameters including different compound method, the intrinsic viscosity and percentage content of PTT and temperature of hot plate on elasticity of fabric are analyzed. The tests show that fabric stretch under a specified tension is much larger with conditions including inside-plate compound, the increasing difference of the viscosity of two polymer and high temperature of hot plate. According to some references, the crimp curvature and crimp elongation of bicomponent fiber would be maximum when the PTT content is 50 %. It exists exceptional case, as the elastic modulus ratio of PET and PTT is much larger.%首先采用自纺丝和企业中试丝两大系列18种聚对苯二甲酸丙二酯(PTT)/聚对苯二甲酸乙二酯(PET)双组分长丝,试制了18种机织物试样,并进行织物弹性测试,分析复合方式、PTT组分特性黏度和含量、热盘温度4个主要纺丝工艺参数对织物弹性的影响.试验发现,在采用板内复合纺丝方法,PTT和PET两组分特性黏度差较大,热盘温度高的纺丝条件下,织物的定力伸长率比较大;文献资料报道的PTT质量分数为50%时双组分纤维卷曲曲率及卷曲伸长率最大仅仅是某些条件下的试验结果,当PET与PTT弹性模量比(e)较大时,存在例外情况.

  1. Study on the Extracting and Decolorizing Technology of Carrot Dietary Fiber%胡萝卜膳食纤维制取及脱色工艺的研究

    Institute of Scientific and Technical Information of China (English)

    鞠国泉; 鞠临子; 赵士豪

    2014-01-01

    This paper studied the optimum extracting and decolorizing technological conditions of carrot dietary fiber ,which derived from the carrot residue as raw material, through the processes of enzymatic hydrolysis and decolorizing. The results showed that the best reacting conditions of protease:the addition amount of protease 0.6%, the reaction temperature 55℃,reaction time 2 h and pH 5.0;the best reacting conditions of amylase:the addition amount of amylase 0.8%, the reaction temperature 55℃, the reaction time 2 h and pH 6;The best decolorizing conditions:H2O2 as the decolorizing agent and its addition amount is 5%, the reaction temperature 55℃, pH 9-10 and the decolorizing time 2 h.The final carrot dietary fiber is light white powder and the purity is 83.25%. Its water holding and swelling capacities are 6.4 g/g and 6.9 mL/g.%研究了以胡萝卜渣为原料,通过酶解、脱色得到质量较好的膳食纤维的最佳提取和脱色工艺条件。结果表明:榨汁后的胡萝卜渣,在pH为5.0,反应温度为55℃,蛋白酶的加入量为0.6%的条件下作用2 h以除去蛋白;在pH为6.0,反应温度为60℃,淀粉酶加入量0.8%的条件下作用2 h以除去淀粉;选用双氧水作脱色剂,其中脱色温度45℃,双氧水加入量为5%,pH为9~10,脱色时间2 h。最后真空干燥即得胡萝卜膳食纤维为浅白色粉末,含量为83.25%(干基)。该试验提取的胡萝卜膳食纤维的持水力6.4 g/g,膨胀力6.9 mL/g。

  2. Properties of ligno-cellulose ficus religiosa leaf fibers

    CSIR Research Space (South Africa)

    Reddy, KO

    2010-04-01

    Full Text Available Religiosa Leaf Fibers International Journal of Polymers and Technologies • 2(1) January-April 2010 29 I J P T © Serials Publications * Corresponding author: E-mail: arajulu@rediffmail.com Properties of Ligno-cellulose Ficus Religiosa Leaf Fibers K. Obi... was also studied and the results are reported in this paper. MATERIALS AND METHODS Materials Extracted ficus leaf fibers, sodium hydroxide pellets (Merk, India), benzene, sodium chlorite, acetic acid, sodium bisulphate and ethanol (S...

  3. Raspberry pomace as a potential fiber source for cookies enrichment

    OpenAIRE

    Danuta Górecka; Bogdan Pachołek; Krzysztof Dziedzic; Milena Górecka

    2010-01-01

      Background. Dietary fiber is not only used for its nutritional properties, but also for its functional and technological properties. The food industry produces significant amounts of by-products which are problems in their disposal. Usually, these products are used in animal feeding. However, the high content of dietary fiber could permit their usage in food products. The dietary fiber in the diet has been recommended on the level 25-30 g/day. Thus, to supplement daily d...

  4. Multicomponent glass fiber optic integrated structures

    Science.gov (United States)

    Pysz, Dariusz; Kujawa, Ireneusz; Szarniak, Przemyslaw; Franczyk, Marcin; Stepien, Ryszard; Buczynski, Ryszard

    2005-09-01

    A range of integrated fiber optic structures - lightguides, image guides, multicapillary arrays, microstructured (photonic) fibers - manufactured in the Institute of Electronic Materials Technology (ITME) is described. All these structures are made of multicomponent glasses (a part of them melted in ITME). They can be manufactured in similar multistep process that involves drawing glass or lightguide rods and tubes preparing glass performs, stacking a bundle with rods and (or) tubes, drawing multifiber or multicapillary performs. Structure formation, technological process, characterization and applications of different integrated structures are presented.

  5. PULP FIBER SIZE CHARACTERIZATION

    Institute of Scientific and Technical Information of China (English)

    Shijie Liu

    2004-01-01

    Pulp fiber length distribution characterization has been examined in this study. Because of the fiber morphology: slender in shape, fiber size distribution characterization is a very difficult task. Traditional technique involves separation of the particles by size,such as Bauer-McNett fiber classifier, and measuring the weight fractions. The particle fractions obtained may or may not reflect the desired size classification.On the other hand, the more recent technique through optical measurement of fiber length is limited by its inability to measure the mass of the particle fractions.Therefore, not only the two techniques fail to generate identical results, either one was accepted to be of better value. Pure hardwood kraft, softwood kraft, and their mixture samples have been measured for their fiber length distributions using an optical fiber quality analyzer: FQA. The data obtained from FQA are extensively studied to investigate more reliable way of representing the fiber length data and thus examining the viable route for measuring the fiber size distributions. It has been found that the fiber length averaged length 11 is a viable indicator of the average pulp fiber length. The fiber size fraction and/or distribution can be represented by the fiber "length" fractions.

  6. Nonlinear compression of high energy fiber amplifier pulses in air-filled hypocycloid-core Kagome fiber.

    Science.gov (United States)

    Guichard, Florent; Giree, Achut; Zaouter, Yoann; Hanna, Marc; Machinet, Guillaume; Debord, Benoît; Gérôme, Frédéric; Dupriez, Pascal; Druon, Frédéric; Hönninger, Clemens; Mottay, Eric; Benabid, Fetah; Georges, Patrick

    2015-03-23

    We report on the generation of 34 fs and 50 µJ pulses from a high energy fiber amplifier system with nonlinear compression in an air-filled hypocycloid-core Kagome fiber. The unique properties of such fibers allow bridging the gap between solid core fibers-based and hollow capillary-based post-compression setups, thereby operating with pulse energies obtained with current state-of-the-art fiber systems. The overall transmission of the compression setup is over 70%. Together with Yb-doped fiber amplifier technologies, Kagome fibers therefore appear as a promising tool for efficient generation of pulses with durations below 50 fs, energies ranging from 10 to several hundreds of µJ, and high average powers.

  7. 中空纤维液相微萃取技术及其在食品有机污染物检测中的应用%Hollow fiber liquid phase microextraction technology and its application in the detection of organic pollutants in food

    Institute of Scientific and Technical Information of China (English)

    朱艳梅; 焦必宁

    2013-01-01

    As a kind of environmental friendly new sample preparation technology,hollow fiber liquid phase microextraction(HF-LPME),integrates extraction,purification and enrichment as a whole.This technology has the characteristic of simple device,low cost,easily combined with a variety of instruments spectrometry,low detection limit,higher recovery,and so on.The application of hollow fiber liquid phase microextraction technology is less in China.This paper reviewed the device,the pattern,the principle of hollow fiber liquid phase microextraction and its application in the detection of organic pollutants in food.%中空纤维液相微萃取作为一种环境友好的新型样品前处理技术,集萃取、净化、浓缩为一体,具有装置简单,成本低,易于与多种仪器联用,富集倍数、检测限低等特点.中空纤维液相微萃取技术在国内的应用还较少.本文综述了中空纤维液相微萃取的装置、模式、原理及在食品有机污染物检测中的应用.

  8. Research on Flax Fiber Reinforced Polylactide Environmental Friendly Composite

    Institute of Scientific and Technical Information of China (English)

    WANG Chun-hong; WANG Rui; LIU Ming; SHEN Lu; BIAN Dong-cai

    2006-01-01

    Biodegradable polylactide acid (PLA) resin can be combined with flax fibers to produce biodegradable composite materials. In our study, commercial PLA fibers were mixed with flax fibers by a non-woven method so as to make nonwoven pre-forms, which can be generated into flax fiber reinforced PLA environmental friendly composites by heat pressing technology. The tensile, flexural and impact properties are tested in order to evaluate the basic physical properties of the composites, and the influenced factors listed as making technology of the pre-forms, weight ratio of flax fibers and heat pressing technology are discussed and optimized, which can be described as weight ratio of flax fibers and PLA fibers is 50/50, heating temperature, time and pressure are respectively 195℃, 20 min and 12.5 Mpa.Preliminary results show that mechanical properties of the flax/PLA composites are quite promising compared with flax/PP composites in common commercial automotive use.Scanning electron microscope (SEM) is used to analyze the tensile specimen fracture surfaces, which shows voids and gaps occurring between flax fibers and PLA matrix and sign of fiber pull-out, the strength of flax/PLA interface can be further improved.

  9. The continuous separation technology of dietary fiber and its components from soybean%大豆膳食纤维及其各组分连续分离工艺研究

    Institute of Scientific and Technical Information of China (English)

    万婕; 余海霞; 刘成梅; 欧阳海峰

    2012-01-01

    摘要:对大豆膳食纤维的提取及其各组分的连续分离工艺进行研究。获得酶一化学法提取膳食纤维的最佳工艺条件为:木瓜蛋白酶用量0.012:1(g/g)、碱提液pH12.03、碱提温度68℃,所得膳食纤维样品中总膳食纤维含量为95.57%,其中可溶性膳食纤维17.44%,不溶性膳食纤维78.13%。碱提酸沉法分离半纤维素的最佳工艺条件为:液固比21:1、提取温度35.5℃、提取时间5.3h。该工艺条件下半纤维素的得率为30.15%,纯度为92.34%。酸性次氯酸钠法分离纤维素的最佳反应条件为:次氯酸钠浓度为16%、pH4.0~4.5、提取温度65℃。纤维素样品的得率为37.24%,产品中纤维素含量91.14%。%The continuous separation technology of dietary fiber and its components from soybean was studied in this paper. Results showed that the optimum conditions for extracting dietary fiber from soybean by chemical-enzyme method were papain 0.012g/g, pH12.03,temperature 68~C. Under this condition,the contents of TDF,SDF and IDF were 95.57% ,17.44% and 78.13% ,respectively. Hemicellulose was separated by alkali extraction and acid precipitation. The better condition were liquid-solid ratio 21:1,35.5℃ ,and extraction time 5.3h,the yield rate and purity of hemicellulose were 30.15% and 92.34%,respectively. The optimum conditions for separation of cellulose from dietary fiber by acidic sodium hypochlorite were concentration of sodium hypochlorite 16%,pH4.0~4.5,and temperature 65%. The yield rate and content of cellulose were 37.24% and 91.14%, respectively.

  10. Glass Fibers: Quo Vadis?

    Directory of Open Access Journals (Sweden)

    Edith Mäder

    2017-02-01

    Full Text Available Since the early 1930s, the process of melting glass and subsequently forming fibers, in particular discontinuous fiber glass or continuous glass filaments, evolved into commercial-scale manufacturing.[...

  11. Fiber Optics Instrumentation Development

    Science.gov (United States)

    Chan, Patrick Hon Man; Parker, Allen R., Jr.; Richards, W. Lance

    2010-01-01

    This is a general presentation of fiber optics instrumentation development work being conducted at NASA Dryden for the past 10 years and recent achievements in the field of fiber optics strain sensors.

  12. Fiber Optic Experience with the Smart Actuation System on the F-18 Systems Research Aircraft

    Science.gov (United States)

    Zavala, Eddie

    1997-01-01

    High bandwidth, immunity to electromagnetic interference, and potential weight savings have led to the development of fiber optic technology for future aerospace vehicle systems. This technology has been incorporated in a new smart actuator as the primary communication interface. The use of fiber optics simplified system integration and significantly reduced wire count. Flight test results showed that fiber optics could be used in aircraft systems and identified critical areas of development of fly-by-light technology. This paper documents the fiber optic experience gained as a result of this program, and identifies general design considerations that could be used in a variety of specific applications of fiber optic technology. Environmental sensitivities of fiber optic system components that significantly contribute to optical power variation are discussed. Although a calibration procedure successfully minimized the effect of fiber optic sensitivities, more standardized calibration methods are needed to ensure system operation and reliability in future aerospace vehicle systems.

  13. 以带蒂筋膜瓣为膜引导骨再生屏障膜包裹接种自体骨髓间充质干细胞的非细胞型组织工程促进骨缺损修复的研究%Feasibility and effectiveness of using pedical fascial flap packing noncelluar tissue engineered bone with autologous red bone marrow and membrance guided bone regeneration technique in the process of bone defect repair

    Institute of Scientific and Technical Information of China (English)

    胡振顺; 杨新明; 王耀一; 孟宪勇; 张瑛; 阴彦林

    2012-01-01

    目的:研究带蒂筋膜瓣为膜引导骨再生(MGBR)屏障膜的可行性及其在促进超临界骨缺损(ECSD)修复方面的实验疗效.方法:50只大白兔,尺骨造ECSD模型,A组单纯植入化骨(NTEB)(对照组),B组制备带蒂筋膜瓣包裹NTEB(实验组),术后对实验动物行一般情况观察、修复区X射线检查、大体观察和组织学检查、骨形态计量分析及生物力学测定分析.结果:各检查结果均显示B组优于A组.结论:以带蒂筋膜瓣为屏障膜具有MGBR作用,其包裹NTEB应用MGBR技术对促进ECSD修复疗效显著.%Objective To study the feasibility and effectiveness of using pedical fascial flap packing noncelluar tissue engineered bone with autologous red bone marrow and membrance guided bone regeneration (MGBR) technique in the process of bone defect repair. Methods 50 rabbits were used to make the experimental model of bilateral defect of the long bone and the periosteum in the ulna. Noncelluar tissue engineered bone (NTEB) was implanted in the bone defect area, one with nothing serving as the control group (group A). While the other wrapped by pedical fascial flap as the experimental group (group B). After the operation, X-ray exam, light density measurement, gross morphology and histological inspection, bone shape measurement analysis in the junctional zone and the biomechanics determination were conducted. Results X-ray films, gross morphology and histological inspection, bone shape measurement analysis , biomechanics determination:the group B was superior to the group A. Conclusions The pedical fascial flap can be used in the MGBR technique. And it has obvious effect on promoting the process of the exceed critical size defect repair.

  14. The power of fiber optics

    Energy Technology Data Exchange (ETDEWEB)

    Roy, C.

    1999-03-01

    The latest technology in optical groundwire (OPGW), involving a single cable serving as a communications network, providing high-speed data and voice transmission, and as a conventional groundwire, part of a power transmission grid, is described. The first-ever symposium devoted to OPGW was held at Hydro-Quebec`s IREQ facility in Montreal, a fitting venue, considering that Hydro-Quebec has installed an extensive network of some 3,500 km of OPGW cables since 1992. The international symposium was attended by over 130 interested experts mainly from North America, but with delegates as far away as Australia, Japan, Libya, Brazil and the UK. The three-day event showcased a number of presentations and demonstrations concerning OPGW splicing requirements, the live-line installation process, the merits of using fiber optics in a power situation, comparison of international standards in OPGW and fiber optics applications, and future developments in fiber optics technology. Demonstration of IREQ`s OPGW type-testing and manufacturer`s exhibits provided an opportunity for hands-on experience.

  15. Formation of thick dielectrophoretic carbon nanotube fibers

    Energy Technology Data Exchange (ETDEWEB)

    Plaado, Margo; Mononen, Robert Matias; Lohmus, Ruenno; Kink, Ilmar; Saal, Kristjan, E-mail: saal@fi.tartu.ee [Institute of Physics, University of Tartu, and Estonian Nanotechnology Competence Centre, 142 Riia Street, 51014 Tartu (Estonia)

    2011-07-29

    The aim of this work was to study the formation process of dielectrophoretic (DEP) carbon nanotube fibers (CNT-fibers) and characterize the fiber properties relevant to their technological applications. The fiber diameter was shown to increase when applied voltage was increased (up to 350 V{sub pp}) and when retraction speed was decreased (down from 400 {mu}m s{sup -1}) in accordance with theoretical expectations. This paper represents the first demonstration of the formation of thick DEP CNT-fibers (up to {approx} 0.4 mm). This is an intriguing result, as it expands the diversity of possible applications of the fibers and facilitates their characterization by analytical methods that require large quantities of the material. The performance of these thick fibers was as follows: a density of {approx} 0.35 g cm{sup -3}, a tensile strength of {approx} 15 MPa, a Young's modulus of {approx} 1 GPa, and an electrical resistivity of {approx} 70 m{Omega} cm.

  16. Effects of hadron irradiation on scintillating fibers

    Energy Technology Data Exchange (ETDEWEB)

    Atac, M. (Univ. of California, Los Angeles, CA (United States) Fermi National Accelerator Lab., Batavia, IL (United States)); Buchanan, C.; Chrisman, D.; Cline, D.; Kolonko, J.; Kubic, J.; Park, J. (Univ. of California, Los Angeles, CA (United States)); Baumbaugh, A.; Binkley, M.; Bross, A.D.; Finley, D.; Elias, J.; Foster, G.W.; Kephart, R.; Kephart, R.; Kim, C.; Park, H.; Pla-Dalmau, A.; Rivetta, C.; Tkaczyk, S.; Wagner, R. (Fermi National Accelerator Lab., Batavia, IL (United States)); Chung, M.; Goldberg, H.; Jeskik, R.; Margulies, S.; Mendez, H.; Solomon, J.; Vaca, F. (Univ. of Illinois, Chicago, IL (United States)); Kelley, C. (Massachusetts College of Pharmacy and Allied Health Sciences, Boston, MA (United States)); Baumbaugh, B.; Bishop, J.; Biswas, N.; Cason, N.; Jacques, J.; Kehoe, R.; Kelly, M.; Kenney, V.; LoSecco, J.; Ruchti, R.; Shephard, W.; Warchol, J.; Wayne, M.; Marchant, J.; Mountain, R.J. (Univ. of Notre Dame, IN (United States)); Davis, D.; Vandergriff, D. (O

    1993-08-01

    Trackers based on scintillating-fiber technology are being considered by the Solenoidal Detector Collaboration at SSC and the D[phi] collaboration at Fermilab. An important issue is the effect of the radiation existing in the detector cores on fiber properties. Most studies of radiation damage in scintillators have irradiated small bulk samples rather than fibers, and have used X-rays, [sup 60]Co gammas, or electron beams, often at accelerated rates. The authors have irradiated some 600 fibers in the Fermilab Tevatron C[phi] area, thereby obtaining a hadronic irradiation at realistic rates. Four-meter-long samples of ten Bicron polystyrene-based fiber types, maintained in air, dry nitrogen, argon, and vacuum atmospheres within stainless-steel tubes, were irradiated for seven weeks at various distances from the accelerator beam pipes. Maximum doses, measured by thermoluminescence detectors, were about 80 Krad. Fiber properties, particularly light yield and attenuation length, have been measured over a one-year period. A description of the work together with the results is presented. At the doses achieved, corresponding to a few years of actual fiber-tracking detector operation, little degradation is observed. In addition, recovery after several days' exposure to air has been noted. Properties of unirradiated samples kept in darkness show no changes after one year.

  17. Fundamentals of fiber lasers and fiber amplifiers

    CERN Document Server

    Ter-Mikirtychev, Valerii (Vartan)

    2014-01-01

    This book covers the fundamental aspects of fiber lasers and fiber amplifiers, and includes a wide range of material from laser physics fundamentals to state-of-the-art topics in this rapidly growing field of quantum electronics. Emphasis is placed on the nonlinear processes taking place in fiber lasers and amplifiers, their similarities, differences to, and their advantages over other solid-state lasers. The reader will learn basic principles of solid-state physics and optical spectroscopy of laser active centers in fibers, main operational laser regimes, and practical recommendations and suggestions on fiber laser research, laser applications, and laser product development. The book will be useful for students, researchers, and professionals who work with lasers, in the optical communications, chemical and biological industries, etc.

  18. How current ginning processes affect fiber length uniformity index

    Science.gov (United States)

    There is a need to develop cotton ginning methods that improve fiber characteristics that are compatible with the newer and more efficient spinning technologies. A literature search produced recent studies that described how current ginning processes affect HVI fiber length uniformity index. Resul...

  19. Research on application of carbon fiber heating material in clothing

    Science.gov (United States)

    Yang, Huanhong

    2017-08-01

    With the development of society, the way of keeping warm clothing is also developing. Carbon fiber has the advantages of high efficiency, safety, mobility and comfort. As a heating element, it has good application prospect. In this paper, the main technology, application issues and design method of carbon fiber heating garment are analyzed, and the key problems in industrialization are also put forward.

  20. ANALYSIS OF THE MAIN FACTORS AFFECTING SECONDARY FIBER DEINKING

    Institute of Scientific and Technical Information of China (English)

    Qing Han; Huanbin Liu; Dongbo Yan

    2004-01-01

    The secondary fiber species,main composition of deinking agent,colloid chemistry behavior of deinking process etc. that may influence the deinking result of secondary fiber were analysed in this dissertation, and some thoughts that optimizing the currently deingking technology were also suggested.

  1. Packaging considerations of fiber-optic laser sources

    Science.gov (United States)

    Heikkinen, Veli; Tukkiniemi, Kari; Vaehaekangas, Jouko; Hannula, Tapio

    1991-12-01

    The continuous progress in material and component technology has generated new laser-based applications that require special packaging techniques. Hybrid integration offers a flexible method to accomplish custom design needs. This paper discusses several aspects in fiber optic packaging including optical, thermal, and mechanical issues. Special emphasis is on optical coupling between a laser diode and a single-mode fiber.

  2. Oil sorption by lignocellulosic fibers

    Science.gov (United States)

    Beom-Goo. Lee; James S. Han; Roger M. Rowell

    1999-01-01

    The oil sorption capacities of cotton fiber, kenaf bast fiber, kenaf core fiber, and moss fiber were compared after refining, extraction, and reduction in particle sizes. The tests were conducted on diesel oil in a pure form. Cotton fiber showed the highest capacity, followed by kenaf core and bast fibers. Wetting, extraction, and reduction in particle size all...

  3. Whole Grains and Fiber

    Science.gov (United States)

    ... whole grains. Does not contain partially hydrogenated oils. Dietary Fiber Dietary fiber is the term for several materials that make ... water. When eaten regularly as part of a diet low in saturated fat and trans fat soluble fiber has been associated with increased diet quality and ...

  4. Resonant filtered fiber amplifiers

    DEFF Research Database (Denmark)

    Alkeskjold, Thomas Tanggaard; Laurila, Marko; Olausson, Christina Bjarnal Thulin

    2013-01-01

    In this paper we present our recent result on utilizing resonant/bandgap fiber designs to achieve high performance ytterbium doped fiber amplifers for achieving diffraction limited beam quality in large mode area fibers, robust bending performance and gain shaping for long wavelength operation of...

  5. Mineral Fiber Toxicology

    Science.gov (United States)

    The chemical and physical properties of different forms of mineral fibers impact biopersistence and pathology in the lung. Fiber chemistry, length, aspect ratio, surface area and dose are critical factors determining mineral fiber-associated health effects including cancer and as...

  6. Fiber Nonlinearities: A Tutorial

    Institute of Scientific and Technical Information of China (English)

    Govind P. Agrawal

    2003-01-01

    Fiber nonlinearities have long been regarded as being mostly harmful for fiber-optic communication systems. Over the last few years, however, the nonlinear effects are increasingly being used for practical telecommunications applications,the Raman amplification being only one of the recent examples. In this tutorial I review the vario us nonlinear effects occurring in optical fibers from both standpoints..

  7. Fiber Nonlinearities: A Tutorial

    Institute of Scientific and Technical Information of China (English)

    Govind; P.; Agrawal

    2003-01-01

    Fiber nonlinearities have long been regarded as being mostly harmful for fiber-optic communication systems. Over the last few years, however, the nonlinear effects are increasingly being used for practical telecommunications applications, the Raman amplification being only one of the recent examples. In this tutorial I review the various nonlinear effects occurring in optical fibers from both standpoints..

  8. High-sensitivity fiber optic acoustic sensors

    Science.gov (United States)

    Lu, Ping; Liu, Deming; Liao, Hao

    2016-11-01

    Due to the overwhelming advantages compared with traditional electronicsensors, fiber-optic acoustic sensors have arisen enormous interest in multiple disciplines. In this paper we present the recent research achievements of our group on fiber-optic acoustic sensors. The main point of our research is high sensitivity interferometric acoustic sensors, including Michelson, Sagnac, and Fabry-Pérot interferometers. In addition, some advanced technologies have been proposed for acoustic or acoustic pressure sensing such as single-mode/multimode fiber coupler, dual FBGs and multi-longitudinal mode fiber laser based acoustic sensors. Moreover, our attention we have also been paid on signal demodulation schemes. The intensity-based quadrature point (Q-point) demodulation, two-wavelength quadrature demodulation and symmetric 3×3 coupler methodare discussed and compared in this paper.

  9. Interface coatings for Carbon and Silicon Carbide Fibers in Silicon Carbide Matrixes Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Interface coatings for fiber-reinforced composites are an enabling technology for high temperature ceramic matrix composites. Because of their availability and...

  10. 直立式浸胶法制备环氧树脂涂覆玻璃纤维%Glass Fiber Coated with Epoxy Resin Utilizing Up-Right Soaking Glue Technology

    Institute of Scientific and Technical Information of China (English)

    从小晔; 王晓钧; 代宝莹

    2012-01-01

    通过直立式浸胶制备环氧树脂(EP)涂覆E-玻璃纤维(E-GF).直立式浸胶方式和聚醚醚酮(PEEK)挤胶辊的采用使得涂覆E-GF的含胶量、涂覆层均匀程度和拉伸载荷高于沉浸式浸胶和手工浸胶.研究表明,直立式浸胶过程中,稀释剂对样品的含胶量影响最大;胶液的温度对涂覆GF拉伸载荷的影响最大.扫描电子显微镜分析证明直立式浸胶的胶液层均匀,断口照片显示纤维产生平齐断裂,使得涂覆纤维的拉伸载荷提高.傅里叶红外光谱分析证实直立式、沉浸式和手工浸胶三种不同浸胶方式不影响树脂胶液的固化反应,含胶量和涂覆均匀度不同是导致涂覆E-GF拉伸性能存在差异的原因.%Up-right soaking glue technology was designed and utilized in this work to manufacture the E-glass fiber ( E-GF) coated with epoxy resin (EP ) .Due to the up-right soaking glue technology and the application of polyetheretherketone (PEEK) roll coater in the process, the gel content, the homogeneity of resin coating layer and the tensile load of the coated E-GF were better than those of the immersion soaking glue technology and the hand-by soaking glue technology.The research results illustrated that the diluent agent exerted a critical influence on gel content and the temperature of resin glue was essential for the tensile load of the coated E-GF respectively.The result of Scanning Electron Microscopy proved that the glue layer on the surface of E-GF was homogenous and the coated E-GF exhibited a level break under the tensile force, which improved the tensile load of the coated E-GF. Through the Fourier-Transfer Infrared investigation, the cross-polymerization of the epoxy resin was proved to be the same for the up-right, immersion and hand-by soaking glue technology.The variation of the gel content and the homogeneity of resin coating layer affected the tensile property of the coated E-GF.

  11. Femtosecond coherent seeding of a broadband Tm:fiber amplifier by an Er:fiber system.

    Science.gov (United States)

    Kumkar, Sören; Krauss, Günther; Wunram, Marcel; Fehrenbacher, David; Demirbas, Umit; Brida, Daniele; Leitenstorfer, Alfred

    2012-02-15

    We generate broadband pulses covering the Yb: and Tm:silica amplification ranges with a passively phase-locked front end based on Er:fiber technology. Full spectral coherence of the octave-spanning output from highly nonlinear germanosilicate bulk fibers is demonstrated. Seeding of a high-power Tm:fiber generates pulses with a clean spectral shape and a bandwidth of 50 nm at a center wavelength of 1.95 μm, pulse energy of 250 nJ, and repetition rate of 10 MHz.

  12. Recent progress in distributed optical fiber Raman photon sensors at China Jiliang University

    Science.gov (United States)

    Zhang, Zaixuan; Wang, Jianfeng; Li, Yi; Gong, Huaping; Yu, Xiangdong; Liu, Honglin; Jin, Yongxing; Kang, Juan; Li, Chenxia; Zhang, Wensheng; Zhang, Wenping; Niu, Xiaohui; Sun, Zhongzhou; Zhao, Chunliu; Dong, Xinyong; Jin, Shangzhong

    2012-06-01

    A brief review of recent progress in researches, productions and applications of full distributed fiber Raman photon sensors at China Jiliang University (CJLU) is presented. In order to improve the measurement distance, the accuracy, the space resolution, the ability of multi-parameter measurements, and the intelligence of full distributed fiber sensor systems, a new generation fiber sensor technology based on the optical fiber nonlinear scattering fusion principle is proposed. A series of new generation full distributed fiber sensors are investigated and designed, which consist of new generation ultra-long distance full distributed fiber Raman and Rayleigh scattering photon sensors integrated with a fiber Raman amplifier, auto-correction full distributed fiber Raman photon temperature sensors based on Raman correlation dual sources, full distributed fiber Raman photon temperature sensors based on a pulse coding source, full distributed fiber Raman photon temperature sensors using a fiber Raman wavelength shifter, a new type of Brillouin optical time domain analyzers (BOTDAs) integrated with a fiber Raman amplifier for replacing a fiber Brillouin amplifier, full distributed fiber Raman and Brillouin photon sensors integrated with a fiber Raman amplifier, and full distributed fiber Brillouin photon sensors integrated with a fiber Brillouin frequency shifter. The Internet of things is believed as one of candidates of the next technological revolution, which has driven hundreds of millions of class markets. Sensor networks are important components of the Internet of things. The full distributed optical fiber sensor network (Rayleigh, Raman, and Brillouin scattering) is a 3S (smart materials, smart structure, and smart skill) system, which is easy to construct smart fiber sensor networks. The distributed optical fiber sensor can be embedded in the power grids, railways, bridges, tunnels, roads, constructions, water supply systems, dams, oil and gas pipelines and other

  13. Near-infrared fiber delivery systems for interstitial photothermal therapy

    Science.gov (United States)

    Slatkine, Michael; Mead, Douglass S.; Konwitz, Eli; Rosenberg, Zvi

    1995-05-01

    Interstitial photothermal coagulation has long been recognized as a potential important, minimally invasive modality for treating a variety of pathologic conditions. We present two different technologies for interstitial photothermal coagulation of tissue with infrared lasers: An optical fiber with a radially symmetric diffusing tip for deep coagulation, and a flat bare fiber for the coagulation of thin and long lesions by longitudinally moving the fiber while lasing in concert. Urology and Gynecology Fibers: The fibers are 600 microns diameter with 20 - 40 mm frosted distal tips protected by a smooth transparent cover. When used with a Neodymium:YAG (Nd:YAG) laser, the active fiber surface diffuses optical radiation in a radial pattern, delivering up to 40 W power, and thus providing consistent and uniform interstitial photothermal therapy. Coagulation depth ranges from 4 to 15 mm. Animal studies in the United States and clinical studies in Europe have demonstrated the feasibility of using these fibers to treat benign prostatic hyperplasia and endometrial coagulation. Rhinology Fiber: The fiber is an 800 micron diameter flat fiber operated at 8 W power level while being interstitially pushed and pulled along its axis. A long and thin coagulated zone is produced. The fiber is routinely used for the shrinking of hypertrophic turbinates without surrounding and bone mucusal damage in ambulatory environments.

  14. Wood versus Plant Fibers: Similarities and Differences in Composite Applications

    Directory of Open Access Journals (Sweden)

    Bo Madsen

    2013-01-01

    Full Text Available The work on cellulose fiber composites is typically strictly divided into two separated research fields depending on the fiber origin, that is, from wood and from annual plants, representing the two different industries of forest and agriculture, respectively. The present paper evaluates in parallel wood fibers and plant fibers to highlight their similarities and differences regarding their use as reinforcement in composites and to enable mutual transfer of knowledge and technology between the two research fields. The paper gives an introduction to the morphology, chemistry, and ultrastructure of the fibers, the modeling of the mechanical properties of the fibers, the fiber preforms available for manufacturing of composites, the typical mechanical properties of the composites, the modeling of the mechanical properties with focus on composites having a random fiber orientation and a non-negligible porosity content, and finally, the moisture sensitivity of the composites. The performance of wood and plant fiber composites is compared to the synthetic glass and carbon fibers conventionally used for composites, and advantages and disadvantages of the different fibers are discussed.

  15. Carbon Fiber from Biomass

    Energy Technology Data Exchange (ETDEWEB)

    Milbrandt, Anelia [Clean Energy Manufacturing Analysis Center, Godlen, CO (United States); Booth, Samuel [Clean Energy Manufacturing Analysis Center, Godlen, CO (United States)

    2016-09-01

    Carbon fiber (CF), known also as graphite fiber, is a lightweight, strong, and flexible material used in both structural (load-bearing) and non-structural applications (e.g., thermal insulation). The high cost of precursors (the starting material used to make CF, which comes predominately from fossil sources) and manufacturing have kept CF a niche market with applications limited mostly to high-performance structural materials (e.g., aerospace). Alternative precursors to reduce CF cost and dependence on fossil sources have been investigated over the years, including biomass-derived precursors such as rayon, lignin, glycerol, and lignocellulosic sugars. The purpose of this study is to provide a comprehensive overview of CF precursors from biomass and their market potential. We examine the potential CF production from these precursors, the state of technology and applications, and the production cost (when data are available). We discuss their advantages and limitations. We also discuss the physical properties of biomass-based CF, and we compare them to those of polyacrylonitrile (PAN)-based CF. We also discuss manufacturing and end-product considerations for bio-based CF, as well as considerations for plant siting and biomass feedstock logistics, feedstock competition, and risk mitigation strategies. The main contribution of this study is that it provides detailed technical and market information about each bio-based CF precursor in one document while other studies focus on one precursor at a time or a particular topic (e.g., processing). Thus, this publication allows for a comprehensive view of the CF potential from all biomass sources and serves as a reference for both novice and experienced professionals interested in CF production from alternative sources.

  16. Optical fiber crossbar switch

    Science.gov (United States)

    Kilcoyne, Michael K.; Beccue, Stephen M.; Brar, Berinder; Robinson, G.; Pedrotti, Kenneth D.; Haber, William A.

    1990-07-01

    Advances in high performance computers and signal processing systems have led to parallel system architectures. The main limitation in achieving the performance expected of these parallel systems has been the realization of an efficient means to interconnect many processors into a effective parallel system. Electronic interconnections have proved cumbersome, costly and ineffective. The Optical Fiber Crossbar Switch (OFCS) is a compact low power, multi-gigahertz bandwidth multi-channel switch which can be used in large scale computer and telecommunication applications. The switch operates in the optical domain using GaAs semiconductor lasers to transmit wideband multiple channel optical data over fiber optic cables. Recently, a 32 X 32 crossbar switching system was completed and demonstrated. Error free performance was obtained at a data bandwidth of 410 MBPS, using a silicon switch IC. The switch can be completely reconfigured in less than 50 nanoseconds under computer control. The fully populated OFCS has the capability to handle 12.8 gigabits per second (GBPS) of data while switching this data over 32 channels without the loss of a single bit during switching. GaAs IC technology has now progressed to the point that 16 X 16 GaAs based crossbar switch Ics are available which have increased the data bandwidth capability to 2.4 GBPS. The present optical interfaces are integrated GaAs transmitter drivers, GaAs lasers, and integrated GaAs optical receivers with data bandwidths exceeding 2.4 GBPS. A system using all Ill-V switching and optoelectronic components is presently under development for both NASA and DoD programs. The overall system is designed to operate at 1.3 GBPS. It is expected that these systems will find wide application in high capacity computing systems based on parallel microprocessor architecture which require high data bandwidth communication between processors. The OFCS will also have application in commercial optical telecommunication systems

  17. Review of diverse optical fibers used in biomedical research and clinical practice.

    Science.gov (United States)

    Keiser, Gerd; Xiong, Fei; Cui, Ying; Shum, Perry Ping

    2014-08-01

    Optical fiber technology has significantly bolstered the growth of photonics applications in basic life sciences research and in biomedical diagnosis, therapy, monitoring, and surgery. The unique operational characteristics of diverse fibers have been exploited to realize advanced biomedical functions in areas such as illumination, imaging, minimally invasive surgery, tissue ablation, biological sensing, and tissue diagnosis. This review paper provides the necessary background to understand how optical fibers function, to describe the various categories of available fibers, and to illustrate how specific fibers are used for selected biomedical photonics applications. Research articles and vendor data sheets were consulted to describe the operational characteristics of conventional and specialty multimode and single-mode solid-core fibers, double-clad fibers, hard-clad silica fibers, conventional hollow-core fibers, photonic crystal fibers, polymer optical fibers, side-emitting and side-firing fibers, middle-infrared fibers, and optical fiber bundles. Representative applications from the recent literature illustrate how various fibers can be utilized in a wide range of biomedical disciplines. In addition to helping researchers refine current experimental setups, the material in this review paper will help conceptualize and develop emerging optical fiber-based diagnostic and analysis tools.

  18. Application of fiber laser for a Higgs factory

    Energy Technology Data Exchange (ETDEWEB)

    Chou, W.

    2014-06-04

    This paper proposes a medium size(~6km) circular Higgs factory based on a photon collider. The recent breakthrough in fiber laser technology by means of a coherent amplifier network makes such a collider feasible and probably also affordable.

  19. Intercalation of Carbon Nanotube Fibers to Improve their Conductivity Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This proposed research will explore how NASA intercalation technology can be used to lower the resistivity of the new Rice-Teijin fiber make them viable for NASA...

  20. Manipulating time-bin qubits with fiber optics components

    OpenAIRE

    Bussieres, Felix; Soudagar, Yasaman; Berlin, Guido; Lacroix, Suzanne; Godbout, Nicolas

    2006-01-01

    We propose two experimental schemes to implement arbitrary unitary single qubit operations on single photons encoded in time-bin qubits. Both schemes require fiber optics components that are available with current technology.

  1. Fiber-Optic Sensing for In-Space Inspection

    Science.gov (United States)

    Pena, Francisco; Richards, W. Lance; Piazza, Anthony; Parker, Allen R.; Hudson, Larry D.

    2014-01-01

    This presentation provides examples of fiber optic sensing technology development activities performed at NASA Armstrong. Examples of current and previous work that support in-space inspection techniques and methodologies are highlighted.

  2. Development of The Liquid Refractometer Using Optical Fiber Detection

    Institute of Scientific and Technical Information of China (English)

    Ming-Horng Chiu; Hsiharng Yang; Shao-Nan Hsu

    2003-01-01

    This article presents a new technique of optical heterodyne interferometry to measure the refractive index of some unknown liquid. It's based on total-internal-reflection heterodyne interferometry and the uses of fiber sensor technology.

  3. Development of The Liquid Refractometer Using Optical Fiber Detection

    Institute of Scientific and Technical Information of China (English)

    Ming-Horng; Chiu; Hsiharng; Yang; Shao-Nan; Hsu

    2003-01-01

    This article presents a new technique of optical heterodyne interferometry to measure the refractive index of some unknown liquid. It's based on total -internal-reflection heterodyne interferometry and the uses of fiber sensor technology.

  4. Multiparameter Fiber Optic Sensor Suite for Structures Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Structural Health Monitoring (SHM) for microspacecraft is a rapidly growing technology area for the use of fiber optics and MEMS. Morgan Research Corporation...

  5. Holey fibers for low bend loss

    Science.gov (United States)

    Nakajima, Kazuhide; Saito, Kotaro; Yamada, Yusuke; Kurokawa, Kenji; Shimizu, Tomoya; Fukai, Chisato; Matsui, Takashi

    2013-12-01

    Bending-loss insensitive fiber (BIF) has proved an essential medium for constructing the current fiber to the home (FTTH) network. By contrast, the progress that has been made on holey fiber (HF) technologies provides us with novel possibilities including non-telecom applications. In this paper, we review recent progress on hole-assisted type BIF. A simple design consideration is overviewed. We then describe some of the properties of HAF including its mechanical reliability. Finally, we introduce some applications of HAF including to high power transmission. We show that HAF with a low bending loss has the potential for use in various future optical technologies as well as in the optical communication network.

  6. 78 FR 16296 - Certain Optoelectronic Devices for Fiber Optic Communications, Components Thereof, and Products...

    Science.gov (United States)

    2013-03-14

    ... COMMISSION Certain Optoelectronic Devices for Fiber Optic Communications, Components Thereof, and Products... complaint filed by Avago Technologies Fiber IP (Singapore) Pte. Ltd. of Singapore (``Avago Fiber IP... importation, or sale within the United States after importation of certain optoelectronic devices for...

  7. Fiber draw synthesis

    Science.gov (United States)

    Orf, Nicholas D.; Shapira, Ofer; Sorin, Fabien; Danto, Sylvain; Baldo, Marc A.; Joannopoulos, John D.; Fink, Yoel

    2011-01-01

    The synthesis of a high-melting temperature semiconductor in a low-temperature fiber drawing process is demonstrated, substantially expanding the set of materials that can be incorporated into fibers. Reagents in the solid state are arranged in proximate domains within a fiber preform. The preform is fluidized at elevated temperatures and drawn into fiber, reducing the lateral dimensions and bringing the domains into intimate contact to enable chemical reaction. A polymer preform containing a thin layer of selenium contacted by tin–zinc wires is drawn to yield electrically contacted crystalline ZnSe domains of sub-100-nm scales. The in situ synthesized compound semiconductor becomes the basis for an electronic heterostructure diode of arbitrary length in the fiber. The ability to synthesize materials within fibers while precisely controlling their geometry and electrical connectivity at submicron scales presents new opportunities for increasing the complexity and functionality of fiber structures.

  8. Nonlinear Photonic Crystal Fibers

    DEFF Research Database (Denmark)

    Hansen, Kim Per

    2004-01-01

    , leading to reduced mode confinement and dispersion flexibility. In this thesis, we treat the nonlinear photonic crystal fiber – a special sub-class of photonic crystal fibers, the core of which has a diameter comparable to the wavelength of the light guided in the fiber. The small core results in a large...... nonlinear coefficient and in various applications, it is therefore possible to reduce the required fiber lengths quite dramatically, leading to increased stability and efficiency. Furthermore, it is possible to design these fibers with zero-dispersion at previously unreachable wavelengths, paving the way...... for completely new applications, especially in and near the visible wavelength region. One such application is supercontinuum generation. Supercontinuum generation is extreme broadening of pulses in a nonlinear medium (in this case a small-core fiber), and depending on the dispersion of the fiber, it is possible...

  9. WiMAX technology and network evolution

    CERN Document Server

    Etemad, Kamran

    2010-01-01

    WiMAX, the Worldwide Interoperability for Microwave Access, represents a paradigm shift in telecommunications technology. It offers the promise of cheaper, smaller, and simpler technology compared to existing broadband options such as DSL, cable, fiber, and 3G wireless.

  10. Fiber optical artificial nose for the food industry

    Science.gov (United States)

    Mahmoud, Mohamed

    2003-04-01

    An artificial nose has been attractive for scientific research and the food industry. This paper proposes that the detection and recognition of odours or chemicals concentrate can be achieved by means of passive and compact size fiber optic sensors (Fiber Bragg Gratings Technology) that will form an olfactory sensor array and a fuzzy logic algorithm that will form the recognition artificial intelligence. The mathematical model of the fiber Bragg gratings olfactory sensor is developed and the design model of the artificial fiber optic nose is introduced.

  11. Enhancing forest value productivity through fiber quality

    Science.gov (United States)

    D. Briggs

    2010-01-01

    Developing markets for carbon storage and bioenergy, shifting of the pulp and paper industry to biorefineries, and the potential of new technologies present the forest sector with exciting transformative opportunities and challenges. One of these challenges will be to understand the implications for fiber (wood) quality. This article provides a definitional context for...

  12. Textile composites based on natural fibers

    CSIR Research Space (South Africa)

    Li, Yan

    2009-04-01

    Full Text Available BASED ON NATURAL FIBERS Yan LI School of Aerospace Engineering and Applied Mechanics, Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai, 200092, P.R.China M. S. SREEKALA Department... of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Cochin-22, Kerala, India - 682 022 Maya JACOB School of Chemical Sciences, Mahatma Gandhi University, Priyadarshini Hills P.O., Kottayam, Kerala, India - 686 560 1...

  13. Towards high-quality optical ceramic YAG fibers for high-energy laser (HEL) applications

    Science.gov (United States)

    Lee, HeeDong; Keller, Kristin; Sirn, Brian

    2012-06-01

    There is a critical demand for high quality, transparent ceramic YAG fibers for high powered fiber lasers. The production of laser quality ceramic fibers hinges on advanced ceramic processing technology, along with the availability of highly sinterable powder with high phase and chemical purity. These two fundamental technologies have been successfully developed at UES. Nd (1.1 a/o) and Yb (1.0 a/o)-doped yttrium aluminum garnet (YAG) fibers with high optical quality were produced by combining UES's tailored powders with advanced consolidation processes including fiber extrusion and vacuum sintering. The as-sintered and as-annealed fibers, approximately 30 microns in diameter, appeared transparent and successfully transmitted laser beams; further development will allow for the production of doped ceramic YAG fiber lasers for advanced high power and high energy fiber laser systems.

  14. Generation and propagation of radially polarized beams in optical fibers

    DEFF Research Database (Denmark)

    Ramachandran, Siddharth; Kristensen, P; Yan, M F

    2009-01-01

    Beams with polarization singularities have attracted immense recent attention in a wide array of scientific and technological disciplines. We demonstrate a class of optical fibers in which these beams can be generated and propagated over long lengths with unprecedented stability, even in the pres......Beams with polarization singularities have attracted immense recent attention in a wide array of scientific and technological disciplines. We demonstrate a class of optical fibers in which these beams can be generated and propagated over long lengths with unprecedented stability, even...... in the presence of strong bend perturbations. This opens the door to exploiting nonlinear fiber optics to manipulate such beams. This fiber also possesses the intriguingly counterintuitive property of being polarization maintaining despite being strictly cylindrically symmetric, a prospect hitherto considered...... infeasible with optical fibers. (C) 2009 Optical Society of America....

  15. Hierarchically Structured Electrospun Fibers

    Directory of Open Access Journals (Sweden)

    Nicole E. Zander

    2013-01-01

    Full Text Available Traditional electrospun nanofibers have a myriad of applications ranging from scaffolds for tissue engineering to components of biosensors and energy harvesting devices. The generally smooth one-dimensional structure of the fibers has stood as a limitation to several interesting novel applications. Control of fiber diameter, porosity and collector geometry will be briefly discussed, as will more traditional methods for controlling fiber morphology and fiber mat architecture. The remainder of the review will focus on new techniques to prepare hierarchically structured fibers. Fibers with hierarchical primary structures—including helical, buckled, and beads-on-a-string fibers, as well as fibers with secondary structures, such as nanopores, nanopillars, nanorods, and internally structured fibers and their applications—will be discussed. These new materials with helical/buckled morphology are expected to possess unique optical and mechanical properties with possible applications for negative refractive index materials, highly stretchable/high-tensile-strength materials, and components in microelectromechanical devices. Core-shell type fibers enable a much wider variety of materials to be electrospun and are expected to be widely applied in the sensing, drug delivery/controlled release fields, and in the encapsulation of live cells for biological applications. Materials with a hierarchical secondary structure are expected to provide new superhydrophobic and self-cleaning materials.

  16. High-Power ZBLAN Glass Fiber Lasers: Review and Prospect

    Directory of Open Access Journals (Sweden)

    Xiushan Zhu

    2010-01-01

    Full Text Available ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF, considered as the most stable heavy metal fluoride glass and the excellent host for rare-earth ions, has been extensively used for efficient and compact ultraviolet, visible, and infrared fiber lasers due to its low intrinsic loss, wide transparency window, and small phonon energy. In this paper, the historical progress and the properties of fluoride glasses and the fabrication of ZBLAN fibers are briefly described. Advances of infrared, upconversion, and supercontinuum ZBLAN fiber lasers are addressed in detail. Finally, constraints on the power scaling of ZBLAN fiber lasers are analyzed and discussed. ZBLAN fiber lasers are showing promise of generating high-power emissions covering from ultraviolet to mid-infrared considering the recent advances in newly designed optical fibers, beam-shaped high-power pump diodes, beam combining techniques, and heat-dissipating technology.

  17. A plating method for metal coating of fiber Bragg grating

    Institute of Scientific and Technical Information of China (English)

    Yulong Li; Hua Zhang; Yan Feng; Gang Peng

    2009-01-01

    We present a method for metal coating optical fiber and in-fiber Bragg grating. The technology process which is based on electroless plating and electroplating method is described in detail. The fiber is firstly coated with a thin copper or nickel plate with electroless plating method. Then, a thicker nickel plate is coated on the surface of the conductive layer. Under the optimum conditions, the surfaces of chemical plating and electroplating coatings are all smooth and compact. There is no visible defect found in the cross-section. Using this two-step metallization method, the in-fiber Bragg grating can be well protected and its thermal sensitivity can be enhanced. After the metallization process, the fiber sensor is successfully embedded in the 42CrMo steel by brazing method. Thus a smart metal structure is achieved. The embedding results show that the plating method for metallization protection of in-fiber Bragg grating is effective.

  18. Ultra-high Frequency Linear Fiber Optic Systems

    CERN Document Server

    Lau, Kam

    2011-01-01

    This book provides an in-depth treatment of both linear fiber-optic systems and their key enabling devices. It presents a concise but rigorous treatment of the theory and practice of analog (linear) fiber-optics links and systems that constitute the foundation of Hybrid Fiber Coax infrastructure in present-day CATV distribution and cable modem Internet access. Emerging applications in remote fiber-optic feed for free-space millimeter wave enterprise campus networks are also described. Issues such as dispersion and interferometric noise are treated quantitatively, and means for mitigating them are explained. This broad but concise text will thus be invaluable not only to students of fiber-optics communication but also to practicing engineers. To the second edition of this book important new aspects of linear fiber-optic transmission technologies are added, such as high level system architectural issues, algorithms for deriving the optimal frequency assignment, directly modulated or externally modulated laser t...

  19. MX optical fiber communication system

    Science.gov (United States)

    Keiser, G.

    The fiber optic (FO) network for the proposed MX mobile basing scheme is described. C3 operations would be implemented through 15,000 km of FO links between 4800 sites. Burying the cables would ensure continued C3 operations in a hostile environment, although protection would be needed from burrowing rodents. Technology development criteria, such as optical sources and photodetectors for the 1300-1600 nm long wavelength region, are noted, together with construction of a test site at an Air Force base in California.

  20. OFDM-PON optical fiber access technologies

    Science.gov (United States)

    Qiu, Kun; Yi, Xinwen; Zhang, Jing; Zhang, Hongbo; Deng, Mingliang; Zhang, Chongfu

    2011-12-01

    The introduction of OFDM into PON networks is to leverage the merits of OFDM to provide the flexibility and reduce the cost. In this paper, we present our latest works on OFDM-PON. Firstly, we propose and demonstrate a novel OFDMPON upstream transmission architecture with traffic aggregation by orthogonal band multiplexing. The multiplexed 10- Gb/s OFDM signal is collectively received. We also conduct a proof-of-concept experiment to verify the architecture. Secondly, we propose and experimentally demonstrate wavelet packet transform based OFDM (WPT-OFDM) using real-valued transforms, which enables the cost-effective intensity modulation/direct detection (IM/DD). Unlike conventional FFT-based OFDM, the need for cyclic prefix is eliminated due to the time-frequency localization properties of the wavelet.

  1. A Polymer Optical Fiber Fuel Level Sensor: Application to Paramotoring and Powered Paragliding

    OpenAIRE

    David Sánchez Montero; Carmen Vázquez; Pedro Contreras Lallana

    2012-01-01

    A low-cost intensity-based polymer optical fiber (POF) sensor for fuel level measurements in paramotoring and powered paragliding is presented, exploiting the advantages of the optical fiber sensing technology. Experimental results demonstrate that the best option can be performed by stripping the fiber at the desired discrete points to measure the fuel level as well as with a gauge-shape fiber bending. The prototype has a good linearity, better than 4% full scale (F.S.), and sensitivity arou...

  2. Space Flight Applications of Optical Fiber; 30 Years of Space Flight Success

    Science.gov (United States)

    Ott, Melanie N.

    2010-01-01

    For over thirty years NASA has had success with space flight missions that utilize optical fiber component technology. One of the early environmental characterization experiments that included optical fiber was launched as the Long Duration Exposure Facility in 1978. Since then, multiple missions have launched with optical fiber components that functioned as expected, without failure throughout the mission life. The use of optical fiber in NASA space flight communications links and exploration and science instrumentation is reviewed.

  3. Monolithic integrated optic fiber Bragg grating sensor interrogator

    Science.gov (United States)

    Mendoza, Edgar A.; Esterkin, Yan; Kempen, Cornelia; Sun, Songjian

    2010-04-01

    Fiber Bragg gratings (FBGs) are a mature sensing technology that has gained rapid acceptance in civil, aerospace, chemical and petrochemical, medicine, aviation and automotive industries. Fiber Bragg grating sensors can be use for a variety of measurements including strain, stress, vibration, acoustics, acceleration, pressure, temperature, moisture, and corrosion distributed at multiple locations within the structure using a single fiber element. The most prominent advantages of FBGs are: small size and light weight, multiple FBG transducers on a single fiber, and immunity to radio frequency interference. A major disadvantage of FBG technology is that conventional state-of-the-art fiber Bragg grating interrogation systems are typically bulky, heavy, and costly bench top instruments that are assembled from off-the-shelf fiber optic and optical components integrated with a signal electronics board into an instrument console. Based on the need for a compact FBG interrogation system, this paper describes recent progress towards the development of a miniature fiber Bragg grating sensor interrogator (FBG-TransceiverTM) system based on multi-channel monolithic integrated optic sensor microchip technology. The integrated optic microchip technology enables the monolithic integration of all of the functionalities, both passive and active, of conventional bench top FBG sensor interrogators systems, packaged in a miniaturized, low power operation, 2-cm x 5-cm small form factor (SFF) package suitable for the long-term structural health monitoring in applications where size, weight, and power are critical for operation.

  4. Microstructure and properties of novel polarization maintaining fiber

    Institute of Scientific and Technical Information of China (English)

    LI Mei-cheng; LIU Li-hua; XUE Jian-jun; XIAO Tian-peng; LIANG Le-tian; ZHAO Lian-cheng

    2005-01-01

    An improved type of elliptical jacket polarization maintaining fiber was developed by using a modified chemical vapor deposition method with special treatment. Different from conventional elliptical jacket, the shape of the stress jacket was transmuted. The cross-section of fiber consists of 5 layers: substrate, outer cladding, stress jacket, inner cladding and core. The cross sectional component distribution was investigated by electron probe microscopy and energy dispersive spectrum. The finite element method was used to calculate the stress birefringence. Based on the analyses of the microstructure, the technological process is improved. The temperature cycling test of the fiber wound into gyroscope coils was performed. The results show that the fiber possesses superior performance at high and low temperatures compared with other fibers. The high homogeneity is achieved by well-controlled modified chemical vapor deposition process. A homogeneous length of 8 km fiber is obtained. With advantages in homogeneity and length, the fiber has great potential in applications such as fiber gyroscopes, fiber hydrophone and other optical fiber sensors.

  5. Intelligent fiber sensing system for the oil field area

    Science.gov (United States)

    Sun, Wenju; Ma, Linping

    2010-08-01

    Optical Fiber strain sensor using fiber Bragg grating are poised to play a major role in structural health from military to civil engineering. Fiber Bragg Grating sensor is a practical type of fiber optic sensors. Its measurement is encoded with the wavelength of the optical signal reflected from fiber Bragg grating. The method of measuring the absolute optical wavelength is a critical component of the fiber optic sensing system. To reliably detect very small changes in the environment at the sensor, the interrogation system must provide accurate and repeatable wavelength measurements. Energy sources are increasingly scarce in the world. Getting oil from the oil-wells has become more and more difficult. Therefore, new technology to monitor the oil-well condition has become extremely important. The traditional electrical sensor system is no longer useful because of the down-hole's high temperature and high pressure environment. The optical fiber sensing system is the first choice to monitor this condition. This system will reduce the cost and increase the productivity. In the high pressure and high temperature environment, the traditional packed fiber grating pressure-temperature sensor will be no longer reliability. We have to find a new fiber grating temperature-pressure sensor element and the interrogation system. In this work we use the very narrow bandwidth birefringent fiber grating as the sensing element. We obtain the interrogation system has 0.1 pm resolution.

  6. Study of fiber optic sugar sensor

    Indian Academy of Sciences (India)

    A Jayanth Kumar; N M Gowri; R Venkateswara Raju; G Nirmala; B S Bellubbi; T Radha Krishna

    2006-08-01

    Over the last two decades, the fiber optic technology has passed through many analytical stages. Some commercially available fiber optic sensors, though in a small way, are being used for automation in mechanical and industrial environments. They are also used for instrumentation and controls. In the present work, an intensity-modulated intrinsic fiber optic sugar sensor is presented. This type of sensor, with slight modification, can be used for on-line determination of the concentration of sugar content in sugarcane juice in sugar industry. In the present set-up, a plastic fiber made of polymethylmethacrylate is used. A portion of the cladding (1 cm, 2 cm, 3 cm) at the mid-point along the length of the fiber is removed. This portion is immersed in sugar solution of known concentration and refractive index. At one end of the fiber an 850 nm source is used and at the other end a power meter is connected. By varying the concentration of sugar solution, the output power is noted. These studies are made due to the change in refractive index of the fluid. The device was found to be very sensitive which is free from EMI and shock hazards, stable and repeatable and they can be remotely interfaced with a computer to give on-line measurements and thus become useful for application in sugar industries.

  7. Fiber optic pressure sensors for nuclear power plants

    Energy Technology Data Exchange (ETDEWEB)

    Hashemian, H.M.; Black, C.L. [Analysis and Measurement Services Corp., Knoxville, TN (United States)

    1995-04-01

    In the last few years, the nuclear industry has experienced some problems with the performance of pressure transmitters and has been interested in new sensors based on new technologies. Fiber optic pressure sensors offer the potential to improve on or overcome some of the limitations of existing pressure sensors. Up to now, research has been motivated towards development and refinement of fiber optic sensing technology. In most applications, reliability studies and failure mode analyses remain to be exhaustively conducted. Fiber optic sensors have currently penetrated certain cutting edge markets where they possess necessary inherent advantages over other existing technologies. In these markets (e.g. biomedical, aerospace, automotive, and petrochemical), fiber optic sensors are able to perform measurements for which no alternate sensor previously existed. Fiber optic sensing technology has not yet been fully adopted into the mainstream sensing market. This may be due to not only the current premium price of fiber optic sensors, but also the lack of characterization of their possible performance disadvantages. In other words, in conservative industries, the known disadvantages of conventional sensors are sometimes preferable to unknown or not fully characterized (but potentially fewer and less critical) disadvantages of fiber optic sensors. A six-month feasibility study has been initiated under the auspices of the US Nuclear Regulatory Commission (NRC) to assess the performance and reliability of existing fiber optic pressure sensors for use in nuclear power plants. This assessment will include establishment of the state of the art in fiber optic pressure sensing, characterization of the reliability of fiber optic pressure sensors, and determination of the strengths and limitations of these sensors for nuclear safety-related services.

  8. Study of a single longitudinal fiber ring laser with a π phase-shifted fiber Bragg grating

    Science.gov (United States)

    Wang, Weitao; Song, Zhiqiang; Qi, Haifeng; Zhang, Xiaolei; Ni, Jiasheng; Guo, Jian; Wang, Chang; Peng, Gangding

    2017-08-01

    A single-longitudinal-mode fiber laser is presented, which is composed of a ring cavity laser and a π phase-shifted fiber Bragg grating. The ring cavity structure can reduce the spatial hole burning, but the mode hopping and competition are still existing due to the long fiber ring cavity length. The π phase-shifted fiber Bragg grating has very narrow transmittance spectrum width as a band-pass filter. Combined with a wavelength-matching fiber Bragg grating, it is able to efficiently suppress the mode hopping and competition in the ring cavity. The single longitudinal mode lasing is verified using a scanning F-P interferometer. Its frequency noise is measured by the self-homodyne technology with a 3×3 optical fiber coupler. The calculated linewidth from the frequency noise is about 21 kHz when the measurement time is 0.2 s.

  9. Femtosecond laser inscription of asymmetric directional couplers for in-fiber optical taps and fiber cladding photonics.

    Science.gov (United States)

    Grenier, Jason R; Fernandes, Luís A; Herman, Peter R

    2015-06-29

    Precise alignment of femtosecond laser tracks in standard single mode optical fiber is shown to enable controllable optical tapping of the fiber core waveguide light with fiber cladding photonic circuits. Asymmetric directional couplers are presented with tunable coupling ratios up to 62% and bandwidths up to 300 nm at telecommunication wavelengths. Real-time fiber monitoring during laser writing permitted a means of controlling the coupler length to compensate for micron-scale alignment errors and to facilitate tailored design of coupling ratio, spectral bandwidth and polarization properties. Laser induced waveguide birefringence was harnessed for polarization dependent coupling that led to the formation of in-fiber polarization-selective taps with 32 dB extinction ratio. This technology enables the interconnection of light propagating in pre-existing waveguides with laser-formed devices, thereby opening a new practical direction for the three-dimensional integration of optical devices in the cladding of optical fibers and planar lightwave circuits.

  10. Polymer optical fiber fuse

    CERN Document Server

    Mizuno, Yosuke; Tanaka, Hiroki; Nakamura, Kentaro

    2013-01-01

    Although high-transmission-capacity optical fibers are in demand, the problem of the fiber fuse phenomenon needs to be resolved to prevent the destruction of fibers. As polymer optical fibers become more prevalent, clarifying their fuse properties has become important. Here, we experimentally demonstrate a fuse propagation velocity of 21.9 mm/s, which is 1 to 2 orders of magnitude slower than that in standard silica fibers. The achieved threshold power density and proportionality constant between the propagation velocity and the power density are respectively 1/186 of and 16.8 times the values for silica fibers. An oscillatory continuous curve instead of periodic voids is formed after the passage of the fuse. An easy fuse termination method is presented herein, along with its potential plasma applications.

  11. Nanotailored Carbon Fibers

    Science.gov (United States)

    2012-04-27

    precursor fiber and also utilize bi- component spinning along with gel spinning, to obtain small diameter fibers. Various processing parameters during...shape of the fiber. In this regard, we have also conducted single component gel spinning using different gelation bath temperatures (100% methanol). SEM...domestic dishwashing detergent, Palmolive antibacterial , 3 wt% detergent and 97% water) for about a week and retested. *** For 5th trial, tungsten

  12. Continuous Fiber Ceramic Composites

    Energy Technology Data Exchange (ETDEWEB)

    None

    2002-09-01

    Fiber-reinforced ceramic composites demonstrate the high-temperature stability of ceramics--with an increased fracture toughness resulting from the fiber reinforcement of the composite. The material optimization performed under the continuous fiber ceramic composites (CFCC) included a series of systematic optimizations. The overall goals were to define the processing window, to increase the robustinous of the process, to increase process yield while reducing costs, and to define the complexity of parts that could be fabricated.

  13. Insulated Fiber Brush.

    Science.gov (United States)

    An insulated-strand fiber brush is provided for a DC motor /generator. The brush is comprised of a plurality of fiber segments which are insulated from one another near the contact surface of a rotor bar. In one embodiment, insulating spacers are fixed to a brush assembly and wear with the fibers, and in another embodiment insulation is provided by a separate shell. (Author)

  14. SILICA SURFACED CARBON FIBERS.

    Science.gov (United States)

    carbon fibers . Several economical and simple processes were developed for obtaining research quantities of silica surfaced carbon filaments. Vat dipping processes were utilized to deposit an oxide such as silica onto the surface and into the micropores of available carbon or graphite base fibers. High performance composite materials were prepared with the surface treated carbon fibers and various resin matrices. The ablative characteristics of these composites were very promising and exhibited fewer limitations than either silica or...treated

  15. 一种用于光纤精密绕线的视觉识别技术%A Design of Visual Identifi cation Technology for Accurate Winding of Optical Fiber

    Institute of Scientific and Technical Information of China (English)

    张万成; 叶泽群

    2015-01-01

    A method to resolve the problem of accurate optical fi ber winding is presented. The method uses visual identification technology to identify the traversing delayed-angle as a feedback signal to achieve precision cable; at the same time the system is able to identify fiber separation occurs during wound too big , and take the line lamination defects, output to the master system processing. The visual recognition system consists of visual elements, Sherlock visual recognition software and applications to identify the composition. The visual identifi cation system has the function to identify the traversing delayed-angle, with identifi cation rate as high as ±0.1°, accuracy of optical fi ber pitch of ±0.4 mm, identifi cation rate against crossed fi ber of 100. Working with host controlling system, the visual identifi cation system is able to realize automatic accurate optical fi ber winding and has passed the take-up verifi cation.%介绍了一种解决光纤精密绕线的方法,该方法利用图像识别技术检测出绕线时的滞后角作为光纤排线的反馈信号,实现精密排线.同时该系统能够识别出绕制过程中出现的光纤间距过大和叠层搭线缺陷,输出给主控系统处理.该视觉识别系统由视觉单元、Sherlock视觉识别软件和识别应用程序组成,识别排线滞后角精度达±0.1°;光纤间距精度达±0.04 mm;搭线识别率100%.该系统通过收线验证,与主控系统配合,可实现对光纤的自动精密缠绕.

  16. Tunable Fiber Bragg Grating Ring Lasers using Macro Fiber Composite Actuators

    Science.gov (United States)

    Geddis, Demetris L.; Allison, Sidney G.; Shams, Qamar A.

    2006-01-01

    The research reported herein includes the fabrication of a tunable optical fiber Bragg grating (FBG) fiber ring laser (FRL)1 from commercially available components as a high-speed alternative tunable laser source for NASA Langley s optical frequency domain reflectometer (OFDR) interrogator, which reads low reflectivity FBG sensors. A Macro-Fiber Composite (MFC) actuator invented at NASA Langley Research Center (LaRC) was selected to tune the laser. MFC actuators use a piezoelectric sheet cut into uniaxially aligned rectangular piezo-fibers surrounded by a polymer matrix and incorporate interdigitated electrodes to deliver electric fields along the length of the piezo-fibers. This configuration enables MFC actuators to produce displacements larger than the original uncut piezoelectric sheet. The FBG filter was sandwiched between two MFC actuators, and when strained, produced approximately 3.62 nm of wavelength shift in the FRL when biasing the MFC actuators from 500 V to 2000 V. This tunability range is comparable to that of other tunable lasers and is adequate for interrogating FBG sensors using OFDR technology. Three different FRL configurations were studied. Configuration A examined the importance of erbium-doped fiber length and output coupling. Configuration B demonstrated the importance of the FBG filter. Configuration C added an output coupler to increase the output power and to isolate the filter. Only configuration C was tuned because it offered the best optical power output of the three configurations. Use of Plastic Optical Fiber (POF) FBG s holds promise for enhanced tunability in future research.

  17. Agave Americana Leaf Fibers

    Directory of Open Access Journals (Sweden)

    Ashish Hulle

    2015-02-01

    Full Text Available The growing environmental problems, the problem of waste disposal and the depletion of non-renewable resources have stimulated the use of green materials compatible with the environment to reduce environmental impacts. Therefore, there is a need to design products by using natural resources. Natural fibers seem to be a good alternative since they are abundantly available and there are a number of possibilities to use all the components of a fiber-yielding crop; one such fiber-yielding plant is Agave Americana. The leaves of this plant yield fibers and all the parts of this plant can be utilized in many applications. The “zero-waste” utilization of the plant would enable its production and processing to be translated into a viable and sustainable industry. Agave Americana fibers are characterized by low density, high tenacity and high moisture absorbency in comparison with other leaf fibers. These fibers are long and biodegradable. Therefore, we can look this fiber as a sustainable resource for manufacturing and technical applications. Detailed discussion is carried out on extraction, characterization and applications of Agave Americana fiber in this paper.

  18. Oriented Fiber Filter Media

    Directory of Open Access Journals (Sweden)

    R. Bharadwaj

    2008-06-01

    Full Text Available Coalescing filters are widely used throughout industry and improved performance will reduce droplet emissions and operating costs. Experimental observations show orientation of micro fibers in filter media effect the permeability and the separation efficiency of the filter media. In this work two methods are used to align the fibers to alter the filter structure. The results show that axially aligned fiber media improve quality factor on the order of 20% and cutting media on an angle from a thick layered media can improve performance by about 40%. The results also show the improved performance is not monotonically correlated to the average fiber angle of the medium.

  19. PULP FIBER SIZE CHARACTERIZATION

    Institute of Scientific and Technical Information of China (English)

    ShijieLiu

    2004-01-01

    Pulp fiber length distribution characterization hasbeen examined in this study. Because of the fibermorphology: slender in shape, fiber size distributioncharacterization is a very difficult task. Traditionaltechnique involves separation of the particles by size,such as Bauer-McNett fiber classifier, and measuringthe weight fractions. Themay or may not reflect theparticle fractions obtaineddesired size classification.On the other hand, the more recent technique throughoptical measurement of fiber length is limited by itsinability to measure the mass of the particle fractions.Therefore, not only the two techniques fail togenerate identical results, either one was accepted tobe of better value. Pure hardwood kraft, softwoodkraft, and their mixture samples have been measuredfor their fiber length distributions using an opticalfiber quality analyzer: FQA. The data obtained fromFQA are extensively studied to investigate morereliable way of representing the fiber length data andthus examining the viable route for measuring thefiber size distributions. It has been found that thefiber length averaged length 1~ is a viable indicator ofthe average pulp fiber length. The fiber size fractionand/or distribution can be represented by the fiber"length" fractions.

  20. ZBLAN, Silica Fiber Comparison

    Science.gov (United States)

    1998-01-01

    This graph depicts the increased signal quality possible with optical fibers made from ZBLAN, a family of heavy-metal fluoride glasses (fluorine combined zirconium, barium, lanthanum, aluminum, and sodium) as compared to silica fibers. NASA is conducting research on pulling ZBLAN fibers in the low-g environment of space to prevent crystallization that limits ZBLAN's usefulness in optical fiber-based communications. In the graph, a line closer to the black theoretical maximum line is better. Photo credit: NASA/Marshall Space Flight Center

  1. All-Fiber Configuration Laser Self-Mixing Doppler Velocimeter Based on Distributed Feedback Fiber Laser.

    Science.gov (United States)

    Wu, Shuang; Wang, Dehui; Xiang, Rong; Zhou, Junfeng; Ma, Yangcheng; Gui, Huaqiao; Liu, Jianguo; Wang, Huanqin; Lu, Liang; Yu, Benli

    2016-07-27

    In this paper, a novel velocimeter based on laser self-mixing Doppler technology has been developed for speed measurement. The laser employed in our experiment is a distributed feedback (DFB) fiber laser, which is an all-fiber structure using only one Fiber Bragg Grating to realize optical feedback and wavelength selection. Self-mixing interference for optical velocity sensing is experimentally investigated in this novel system, and the experimental results show that the Doppler frequency is linearly proportional to the velocity of a moving target, which agrees with the theoretical analysis commendably. In our experimental system, the velocity measurement can be achieved in the range of 3.58 mm/s-2216 mm/s with a relative error under one percent, demonstrating that our novel all-fiber configuration velocimeter can implement wide-range velocity measurements with high accuracy.

  2. Lasers and optical fibers in medicine

    CERN Document Server

    Katzir, Abraham

    1993-01-01

    The increasing use of fiber optics in the field of medicine has created a need for an interdisciplinary perspective of the technology and methods for physicians as well as engineers and biophysicists. This book presents a comprehensive examination of lasers and optical fibers in an hierarchical, three-tier system. Each chapter is divided into three basic sections: the Fundamentals section provides an overview of basic concepts and background; the Principles section offers an in-depth engineering approach; and the Advances section features specific information on systems an

  3. Enhancing Optical Communications with Brand New Fibers

    DEFF Research Database (Denmark)

    Morioka, Toshio; Awaji, Yoshinari; Ryf, Roland

    2012-01-01

    Optical fibers have often been considered to offer effectively infinite capacity to support the rapid traffic growth essential to our information society. However, as demand has grown and technology has developed, we have begun to realize that there is a fundamental limit to fiber capacity of ~ 100....... This article reviews the most recent research efforts around the globe launched over the past few years with a view to overcome these limitations and substantially increase capacity by exploring the last degree of freedom available: the spatial domain. Central to this effort has been the development of brand...

  4. Applications of monolithic fiber interferometers and actively controlled fibers

    OpenAIRE

    Rugeland, Patrik

    2013-01-01

    The objective of this thesis was to develop applications of monolithic fiber devices and actively controlled fibers. A special twin-core fiber known as a ‘Gemini’ fiber was used to construct equal arm-length fiber interferometers, impervious to temperature and mechanical perturbations. A broadband add/drop multiplexer was constructed by inscribing fiber Bragg gratings in the arms of a Gemini Mach-Zehnder interferometer. A broadband interferometric nanosecond switch was constructed from a micr...

  5. Investigations of sewn preform characteristics and quality aspects for the manufacturing of fiber reinforced polymer composites

    OpenAIRE

    Ogale, Amol

    2017-01-01

    Sewn net-shape preform based composite manufacturing technology is widely accepted in combination with liquid composite molding technologies for the manufacturing of fiber reinforced polymer composites. The development of threedimensional dry fibrous reinforcement structures containing desired fiber orientation and volume fraction before the resin infusion is based on the predefined preforming processes. Various preform manufacturing aspects influence the overall composite m...

  6. Millimeter-wave and Terahertz Reconfigurable Radio-over-Fiber Systems

    DEFF Research Database (Denmark)

    Vegas Olmos, Juan José

    when deploying fiber is not an option. Radio-over-Fiber (RoF) technologies have evolved from a blue sky academic topic in the 90s to a main driver within the current quest for the 5th generation mobile systems (5G). A twist in RoF technologies is that it has found along the way niches in areas non...

  7. Soluble and insoluble fiber (image)

    Science.gov (United States)

    Dietary fiber is the part of food that is not affected by the digestive process in the body. ... of the stool. There are two types of dietary fiber, soluble and insoluble. Soluble fiber retains water and ...

  8. A Novel Polarization Maintaining Fiber

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    It introduces a novel elliptical jacket polarization maintaining fiber, whose SAP is like numeral "1". One preform can be drawn over 8km. Fiber's performances show that it is fit for fiber gyroscope and other sensors.

  9. A Novel Polarization Maintaining Fiber

    Institute of Scientific and Technical Information of China (English)

    Benjamin Xue

    2003-01-01

    It introduces a novel elliptical jacket polarization maintaining fiber, whose SAP is like numeral "1" One preform can be drawn over 8km. Fiber's performances show that it is fit for fiber gyroscope and other sensors.

  10. Fiber design and realization of point-by-point written fiber Bragg gratings in polymer optical fibers

    DEFF Research Database (Denmark)

    Stefani, Alessio; Stecher, Matthias; Town, Graham E.

    2012-01-01

    and because they allow to tune the guiding parameters by modifying the microstructure. Now a days the only technique used to write gratings in such fibers is the phase mask technique with UV light illumination. Despite the good results that have been obtained, a limited flexibility on the grating design...... and the very long times required for the writing of FBGs raise some questions about the possibility of exporting POF FBGs and the sensors based on them from the laboratory bench to the mass production market. The possibility of arbitrary design of fiber Bragg gratings and the very short time required to write...... the gratings make the point-by-point grating writing technique very interesting and would appear to be able to fill this technological gap. On the other end this technique is hardly applicable for microstructured fibers because of the writing beam being scattered by the air-holes. We report on the design...

  11. Technology optimization for manufacturing biodegradable mulch using soybean straw fiber%大豆秸秆纤维制造可降解地膜工艺参数优化

    Institute of Scientific and Technical Information of China (English)

    李丽霞; 纪文义※; 陈海涛; 周成

    2013-01-01

      A mount of straw residue left in the field is able to raise the environmental pollution and resource waste. Utilization of the straw resource enables to resolve these problems, promote the economic growth, open the new industries and increase employment. The manufacture of biodegradable film raises the high utilization value of soybean straw resources. The biodegradable film is low cost and friend environment, which can meet the requirements of covering and cultivation. The method applied five factors and five levels 1/2 quadratic regression orthogonal rotation center. Grammage, mixing ratio, rosin, bauxite, and wet strength agent were influencing factors. Dry tensile strength, wet tensile strength were objective functions. The measurement of dry tensile strength was referenced to the GB/T453-1989 and the measurement of wet tensile strength was referenced to the GB/T465.2-1989. This paper analyzed the effect of factors on the dry tensile strength and wet tensile strength, the rate of factors on objective function, and the optimal technology parameters of soybean straw fiber for manufacturing biodegradable mulch. Through the analysis of the effect of factors on function, the models of dry tensile strength and wet tensile strength were built and the models were significantly different. The rank of effect of every factor on functions was judged by the F value. The results showed that 1)The rank of effect of five factors on dry tensile strength:KP mixture ratio, grammage, wet strength agent, rosin and bauxite;2)The rank of effect of five factors on the wet tensile:KP mixing ratio, grammage, wet strength agent, bauxite and rosin;3)in the conditions when grammage of 50-110 g/m2, mixing ratio of 0-50%, wet strength agent of 1.2%-2.0%, rosin of 0.3%-1.5%, bauxite of 1%-5%, optimal technology parameters of soybean straw fiber manufacturing biodegradable film were grammage of 92-110 g/m2, mixing ratio of 23.3%-30%, wet strength agent of 1.2%, rosin of 0.3%, bauxite of

  12. Characteristics of Angora rabbit fiber using optical fiber diameter analyzer.

    Science.gov (United States)

    Rafat, S A; de Rochambeau, H; Brims, M; Thébault, R G; Deretz, S; Bonnet, M; Allain, D

    2007-11-01

    An experiment was conducted to describe the characteristics of Angora rabbit fiber using optical fiber diameter analyzer (OFDA). A total of 349 fleece samples were collected from 60 French Angora rabbits. Recorded measurements of OFDA were as follows: mean fiber diameter, CV of fiber diameter, comfort factor, spinning fineness, mean fiber curvature, SD of fiber curvature, mean opacity of fibers, percentage of medullated fibers, mean fiber diameter along the length, and SD of fiber diameter along the length. Comfort factor is the percentage of fibers less than or equal to 30 microns. The main effects included in the mixed model were fixed effects of group, harvest season, and age and a random effect of animal. Correlations among total fleece weight, compression, and OFDA measurements were calculated. Mean fiber diameter was lower than the fiber diameter along the length. Mean percentage of medullated fibers was very low and ranged from 0.1 to 7.3%. The mean comfort factor was 97.5% and ranged from 93.3 to 99.8%. The mean fiber curvature was 40.1 degrees/mm. The major changes in Angora fleece characteristics from 8 to 105 wk of age were an increase in fiber diameter, CV of fiber diameter, mean fiber diameter along the length and curvature, and a decrease in compression and comfort factor. The effect of harvest season was significant on some fiber characteristics. Mean fiber diameter and the mean fiber diameter along the length had a positive correlation with total fleece weight. The OFDA methodology is a method to evaluate fiber diameter, CV of fiber diameter, and bristle content through measuring of the comfort factor. However, OFDA is not adapted for measuring opacity or size of the medulla, or both, in Angora wool and needs a new definition or a special calibration. The spinning fineness should be redefined and adapted for Angora rabbits.

  13. Combined electromechanical impedance and fiber optic diagnosis of aerospace structures

    Science.gov (United States)

    Schlavin, Jon; Zagrai, Andrei; Clemens, Rebecca; Black, Richard J.; Costa, Joey; Moslehi, Behzad; Patel, Ronak; Sotoudeh, Vahid; Faridian, Fereydoun

    2014-03-01

    Electromechanical impedance is a popular diagnostic method for assessing structural conditions at high frequencies. It has been utilized, and shown utility, in aeronautic, space, naval, civil, mechanical, and other types of structures. By contrast, fiber optic sensing initially found its niche in static strain measurement and low frequency structural dynamic testing. Any low frequency limitations of the fiber optic sensing, however, are mainly governed by its hardware elements. As hardware improves, so does the bandwidth (frequency range * number of sensors) provided by the appropriate enabling fiber optic sensor interrogation system. In this contribution we demonstrate simultaneous high frequency measurements using fiber optic and electromechanical impedance structural health monitoring technologies. A laboratory specimen imitating an aircraft wing structure, incorporating surfaces with adjustable boundary conditions, was instrumented with piezoelectric and fiber optic sensors. Experiments were conducted at different structural boundary conditions associated with deterioration of structural health. High frequency dynamic responses were collected at multiple locations on a laboratory wing specimen and conclusions were drawn about correspondence between structural damage and dynamic signatures as well as correlation between electromechanical impedance and fiber optic sensors spectra. Theoretical investigation of the effect of boundary conditions on electromechanical impedance spectra is presented and connection to low frequency structural dynamics is suggested. It is envisioned that acquisition of high frequency structural dynamic responses with multiple fiber optic sensors may open new diagnostic capabilities for fiber optic sensing technologies.

  14. Development of fiber product recycling technology in fiscal 1998. Achievement report on 'technological development in relation with regeneration and utilization of wool fibers'; 1998 nendo sen'i seihin recycle gijutsu kaihatsu seika hokokusho. Wool sen'i no saisei oyobi riyo ni kansuru gijutsu kaihatsu

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-03-01

    With an objective to develop products of regenerated wool made by utilizing used clothes, and enhance the added value thereon, research and development has been made. In using the recovered suits as the regenerated resources, discussions were given on performing primary mechanical classification before carrying out rag opening and crushing. As a result, it was discovered that the classification is possible if such facilities as electrostatic devices and air-blowing separators are used. However, the secondary classification was difficult either by manual or mechanical means because the opened and crushed materials must be divided according to the original materials. In the research of the re-commercialization technology, discussions were given on developing the applications of felt products (non-woven fabrics) occupying the majority of consumption of wool materials recovered from suits, and of spun yarns utilized in cotton fabrics. As a result, it was discovered that the recovered wool materials can be made into products having features not available in conventional mops, if their feature of oil absorbing performance is made of the best use. Furthermore, researches were made on wool as a synthetic leather material that utilizes the protein constituent being the wool constituting substance. (NEDO)

  15. RF Fiber Optic Link.

    Science.gov (United States)

    1984-06-01

    CONTENTS (Continued) 0 o p- Paragraph Title Page 4.6.3 Laser Diode and Single Mode Fiber Interface ....... 68 0 4.6.4 Laser Noise Discussion...A111-4. 2. 0. Marcuse and C. L. Lin, "Low Dispersion Single-Mode Fiber Transmission - The Question of Practical Versus Theoretical Maxlimum...001/0161A 68 ,.-. .- ,-... -. ..- , .. -............. . ............... • :q

  16. DETERMINAÇÃO DO NÚMERO E DO ÂNGULO DE CONVOLUÇÃO DA FIBRA DE ALGODÃO E SUA RELAÇÃO COM PROPRIEDADES TECNOLÓGICAS DA FIBRA E DO FIO COTTON FIBER NUMBER AND CONVOLUTION ANGLE MEASUREMENT AND ITS RELATION TO YARN AND FIBER TECHNOLOGICAL PROPERTIES

    Directory of Open Access Journals (Sweden)

    NORMA DE MAGALHÃES ERISMANN

    1998-01-01

    Full Text Available A linhagem de algodoeiro IAC 20-233 e as variedades comerciais IAC 21 e IAC 22 foram caracterizadas morfologicamente pelo número e pelo ângulo de convolução de suas fibras, utilizando-se microscopia óptica. A variedade IAC 21 apresentou fibras com menor número e ângulo de convolução que a IAC 20-233 e a IAC 22, enquanto estas foram semelhantes entre si. Os três genótipos apresentaram fibras de maturidade similar. O índice Micronaire (medida do complexo finura + maturidade da variedade IAC 21 foi maior que o dos demais, correspondendo, portanto, a fibras mais grossas. Isso pode ter contribuído para diminuir o número e o ângulo de convolução e, como conseqüência, deprimido a elongação da fibra e do fio de algodão produzido.Two cotton cultivars (IAC 21 and IAC 22 and a breeding line (IAC 20-233 were morphologically characterized by the fiber number of convolutions and the convolution angle determined using optical microscopy. IAC 21 presented a smaller value for those traits than the ones determined for IAC 22 and IAC 20-233, which presented similar values. All three genotypes produced fibers with similar maturity. The highest Micronaire index (measurement of the complex fineness + maturity obtained by the IAC 21 fiber, corresponds to the thickest fibers. This fact may lead to a reduction of the fiber number and angle of convolution and therefore decreased fiber and yarn elongation.

  17. Green insulation: hemp fibers

    Energy Technology Data Exchange (ETDEWEB)

    Anon

    2011-09-15

    Indian hemp (Cannabis indica) is known for its psychotropic values and it is banned in most countries. However, industrial hemp (Cannabis sativa) is known for its tough fibers. Several manufactures in Europe including, small niche players, have been marketing hemp insulation products for several years. Hemp is a low environmental impact material. Neither herbicide nor pesticide is used during the growth of hemp. The fibers are extracted in a waste-free and chemical-free mechanical process. Hemp can consume CO2 during its growth. In addition, hemp fiber can be disposed of harmlessly by composting or incineration at the end of its life. Hemp fibers are processed and treated only minimally to resist rot and fungal activity. There is little health risk when producing and installing the insulation, thanks to the absence of toxic additive. Its thermal resistance is comparable to mineral wool. But the development and marketing of hemp fibers may be restricted in North America.

  18. Python fiber optic seal

    Energy Technology Data Exchange (ETDEWEB)

    Ystesund, K.; Bartberger, J.; Brusseau, C.; Fleming, P.; Insch, K.; Tolk, K.

    1993-08-01

    Sandia National Laboratories has developed a high security fiber optic seal that incorporates tamper resistance features that are not available in commercial fiber optic seals. The Python Seal is a passive fiber optic loop seal designed to give indication of unauthorized entry. The seal includes a fingerprint feature that provides seal identity information in addition to the unique fiber optic pattern created when the seal is installed. The fiber optic cable used for the seal loop is produced with tamper resistant features that increase the difficulty of attacking that component of a seal. A Seal Reader has been developed that will record the seal signature and the fingerprint feature of the seal. A Correlator software program then compares seal images to establish a match or mismatch. SNL is also developing a Polaroid reader to permit hard copies of the seal patterns to be obtained directly from the seal.

  19. Quantum cryptography over underground optical fibers

    Energy Technology Data Exchange (ETDEWEB)

    Hughes, R.J.; Luther, G.G.; Morgan, G.L.; Peterson, C.G.; Simmons, C.

    1996-05-01

    Quantum cryptography is an emerging technology in which two parties may simultaneously generated shared, secret cryptographic key material using the transmission of quantum states of light whose security is based on the inviolability of the laws of quantum mechanics. An adversary can neither successfully tap the key transmissions, nor evade detection, owing to Heisenberg`s uncertainty principle. In this paper the authors describe the theory of quantum cryptography, and the most recent results from their experimental system with which they are generating key material over 14-km of underground optical fiber. These results show that optical-fiber based quantum cryptography could allow secure, real-time key generation over ``open`` multi-km node-to-node optical fiber communications links between secure ``islands.``

  20. Innovative fiber coating systems based on organic modified ceramics

    Science.gov (United States)

    Schuster, Kay; Kobelke, Jens; Rose, Klaus; Helbig, Manfred; Zoheidi, Mohammad; Heinze, Alexander

    2010-02-01

    We describe the application of inorganic organic hybrid materials (ORMOCERs) as optical fiber coatings for use in Fiber Bragg Grating sensors and high power transmission fibers. The materials are UV curable, enable a single layer thickness of about 50 μm and show high a high peak temperature stability >300 °C. Regarding the fiber protection the coatings have been investigated using tensile strength measurements before and after temperature load. Best coatings maintain the high tensile strength of 68 N (125 μm fiber) with a Weibull parameter of 182 after a temperature cycling up to 300 °C. For the first time a low refractive index ORMOCER will be presented showing a numerical aperture of 0.47 at a wavelength of 1000 nm on a pure silica fiber. This corresponds to a refractive index of 1.37. The fiber possesses a fiber loss of 18 dB/km at a wavelength of 1000 nm. The fibers have been coated using a gravity as well as pressure technology. The latter possesses extremely minimized die equipment and is therefore well applicable for small coating amounts. The so called dead volume within the coating die is about 1 ml. The overall dead volume is only influenced by the supply pipe and can be reduced down to 5 ml.

  1. Method for the preparation of carbon fiber from polyolefin fiber precursor, and carbon fibers made thereby

    Energy Technology Data Exchange (ETDEWEB)

    Naskar, Amit Kumar; Hunt, Marcus Andrew; Saito, Tomonori

    2015-08-04

    Methods for the preparation of carbon fiber from polyolefin fiber precursor, wherein the polyolefin fiber precursor is partially sulfonated and then carbonized to produce carbon fiber. Methods for producing hollow carbon fibers, wherein the hollow core is circular- or complex-shaped, are also described. Methods for producing carbon fibers possessing a circular- or complex-shaped outer surface, which may be solid or hollow, are also described.

  2. Development Of Porous Glass Fiber Optic Sensors

    Science.gov (United States)

    Macedo, P. B.; Barkatt, Aa.; Feng, X.; Finger, S. M.; Hojaji, H.; Laberge, N.; Mohr, R.; Penafiel, M.; Saad, E.

    A method for producing rugged, continuous porous glass fiber optic sensors was developed. pH and temperature sensors based on this technology have been successfully produced. The sensor portion of the fiber is made porous by selective leaching of a specially formulated borosilicate glass fiber. This results in a strong, monolithic structure where the sensor portion of the fiber remains integrally attached to the rest of the fiber (which acts as a light pipe), essentially eliminating losses at the sensor-light pipe interface. Pore size in the sensor can be controllably varied by modifying heat treatment conditions, making these sensors suitable for chemical concentration measurements in liquids and gases. Appropriate dyes were chemically bonded by silanization to the large interior surface area of the porous sensors to produce the pH and temperature sensors. Cresol red and phenol red were used for pH and pinacyanol chloride was used for temperature sensing. The sensitivity of these devices can be controlled by varying the concentration of the chemically bonded dye and the length of the porous region. Optical absorbance measurements were made in the visible range. The tip of the sensors was coated with a thin, porous layer of gold to reflect the incident light, resulting in a double pass across the porous sensor. Experimental measurements were made over a pH range of 3 to 8 and a temperature range of 28-70 C. These porous glass fiber optic sensors were found to be rugged and reliable due to their monolithic structure and large interior surface area for attachment of active species. A broad range of sensors based on this technology could be developed by using different active species, such as enzymes and other biochemicals, which could be bonded to the interior surface of the porous glass sensor.

  3. 纤维素酶酶法改性玉米麸皮膳食纤维粉的工艺研究%Technology Research of Cellulase Enzyme Modified the Corn Bran Dietary Fiber Powder

    Institute of Scientific and Technical Information of China (English)

    王刚; 王蕾

    2012-01-01

    With corn bran as raw materials, preparing corn bran dietary fiber, through the enzymatic modification to improve the quality of dietary fiber. The following conclusions were drawn: corn dietary fiber modified process Used cellulase enzyme to obtain the soluble dietary fiber and obtain ratio was 26.45%. The optimal conditions were: cellulase dosage of 15.78 U/g, hydrolysis time 3.01 h, hydrolysis temperature 56.56 ℃ and enzyme pH 5.56.%以玉米麸皮为原料,制备膳食纤维粉,通过纤维素酶对其进行改性,提高膳食纤维品质。采用纤维素酶法,得到的可溶性膳食纤维得率为26.45%。其最适反应条件为:酶添加量15.78 U/g、酶解时间3.01 h、酶解温度50.56℃和酶解pH 5.56。

  4. High capacity fiber optic sensor networks using hybrid multiplexing techniques and their applications

    Science.gov (United States)

    Sun, Qizhen; Li, Xiaolei; Zhang, Manliang; Liu, Qi; Liu, Hai; Liu, Deming

    2013-12-01

    Fiber optic sensor network is the development trend of fiber senor technologies and industries. In this paper, I will discuss recent research progress on high capacity fiber sensor networks with hybrid multiplexing techniques and their applications in the fields of security monitoring, environment monitoring, Smart eHome, etc. Firstly, I will present the architecture of hybrid multiplexing sensor passive optical network (HSPON), and the key technologies for integrated access and intelligent management of massive fiber sensor units. Two typical hybrid WDM/TDM fiber sensor networks for perimeter intrusion monitor and cultural relics security are introduced. Secondly, we propose the concept of "Microstructure-Optical X Domin Refecltor (M-OXDR)" for fiber sensor network expansion. By fabricating smart micro-structures with the ability of multidimensional encoded and low insertion loss along the fiber, the fiber sensor network of simple structure and huge capacity more than one thousand could be achieved. Assisted by the WDM/TDM and WDM/FDM decoding methods respectively, we built the verification systems for long-haul and real-time temperature sensing. Finally, I will show the high capacity and flexible fiber sensor network with IPv6 protocol based hybrid fiber/wireless access. By developing the fiber optic sensor with embedded IPv6 protocol conversion module and IPv6 router, huge amounts of fiber optic sensor nodes can be uniquely addressed. Meanwhile, various sensing information could be integrated and accessed to the Next Generation Internet.

  5. Effects of Fiber Denier, Fiber Cross-Sectional Shape and Fabric Density on Acoustical Behavior of Vertically Lapped Nonwoven Fabrics

    Directory of Open Access Journals (Sweden)

    Mevlut Tascan, Ph.D.

    2008-06-01

    Full Text Available Acoustical insulation and absorption properties of nonwoven fabrics depend on fiber geometry and fiber arrangement within the fabric structure. The different structures of the fibers result in different total surface areas of nonwoven fabrics. Nonwoven fabrics such as vertically lapped fabrics are ideal materials for use as acoustical insulation products, because they have high total surface. Vertically lapped nonwoven technology consists of carding, perpendicular layering of the carded webs, and through-air bonding using synthetic binder fibers. The surface area of the fabric is directly related to the denier and cross-sectional shape of the fibers in the fabric. Smaller deniers yield more fibers per unit weight of the material, higher total fiber surface area, and greater possibilities for a sound wave to interact with the fibers in the fabric structure.The research in the literature uses two methods for measuring acoustical properties of fabric materials: the impedance tube and reverberation room method. Small test samples are in the impedance tube method and sound absorption coefficient is determined at each frequency. Large reverberation rooms and large test samples are used for the reverberation room method. A direct comparative acoustical properties measurement device that was designed and fabricated at Clemson University School of Materials Science & Engineering was used to measure acoustical insulation in this research. This paper provides a description of the measurement devices and acoustical measurement data for vertically lapped nonwoven fabrics made from three different polyester fiber shape and two denier levels.

  6. Technologies for Optical Processing

    DEFF Research Database (Denmark)

    Stubkjær, Kristian

    2008-01-01

    The article consists of a Powerpoint presentation on technologies for optical processing. The paper concludes that the nonlinear elements based on SOA, fibers and waveguide structures have capabilities of simple processing at data rates of 100-600 Gb/s. Switching powers comparable to electronics...

  7. Experiment Study of Fiber Optic Sensing in Railway Security Monitoring

    Institute of Scientific and Technical Information of China (English)

    Dian Fan; De-Sheng Jiang; Wei-Lai Li

    2008-01-01

    Aiming at some security problems in railway running and the application condition of existing technology, this paper studies some issues of using fiber optic sensing technology in railway security monitoring. Through field experiment measuring the strain of the rail and analyzing the experiment data, the method of diagnosing the health condition of rail and wheel is investigated.

  8. Clean Energy Manufacturing Analysis Center. 2015 Research Highlights -- Carbon Fiber

    Energy Technology Data Exchange (ETDEWEB)

    Das, Sujit [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2016-03-01

    CEMAC has conducted four major studies on the manufacturing of clean energy technologies. Three of these focused on the end product: solar photovoltaic modules, wind turbines, and automotive lithium-ion batteries. The fourth area focused on a key material for manufacturing clean energy technologies, carbon fiber.

  9. Polymer optical motherboard technology

    Science.gov (United States)

    Keil, N.; Yao, H.; Zawadzki, C.; Grote, N.; Schell, M.

    2008-02-01

    In this paper, different hybridly integrated optical devices including optical multiplexer/ demultiplexer and optical transceivers are described. The devices were made using polymer planar light wave circuit (P2LC) technology. Laser diodes, photodiodes, and thin-film filters have been integrated. Key issues involved in this technology, in particular the coupling between laser diodes and polymer waveguides, and between waveguides and photodiodes and also fibers are discussed.

  10. Linear and nonlinear properties in soft glass optical fibers for device applications

    Science.gov (United States)

    Kiani, Leily; Munasinghe, Tilanka; Zhang, Wen Qi; Afshar, Shahraam; Sharping, Jay

    2012-02-01

    Optical fiber technology is predominantly based on silica glass fibers. Non-silica soft glass fibers exhibit substantially different optical properties such as higher refractive index, larger nonlinear coefficient and structural fabrication flexibility. We aim to exploit these novel properties for device applications such as sensing and light generation. We report measurement of linear dispersion and nonlinear coefficient in the range of 1.5 μm in two custom designed soft glass microstructure optical fibers. The fibers are composed of SF57 (Schott) and Bismuth-doped silica (Asahi Glass Co.) respectively with Hexagonal Wagonwheel microstructure design. These fibers are designed to allow phase matching of nonlinear optical processes near 1.6μm. Our measurements indicate nonlinear coefficients 1000 times that of standard silica fiber. Transverse modes in these fibers are difficult to separate leading to a complicated dispersion results. Next steps include observation of parametric generation and Brillouin gain.

  11. 两种形态棉秆与回收塑料制备复合板材的工艺%Composite Processing Technology from Cotton Stalk Fiber and Particles Combined with Two Types of Recycled Plastics

    Institute of Scientific and Technical Information of China (English)

    蔺焘; 郭文静; 高黎; 常亮; 王正

    2011-01-01

    采用两种形态的棉秆与两种塑料复合,制备棉秆/塑料复合板材,分析棉秆形态、塑料种类及工艺因子对复合板材性能的影响.结果表明:刨花态棉秆复合板材的性能优于搓丝态棉秆,热压温度、聚丙烯比例和板材密度对复合板材的性能有显著影响.优化条件下制成的棉秆搓丝/聚丙烯复合板材性能,超过室外结构用刨花板性能指标要求.%The authors processed cotton stalks into fiber and particles, and combined them with recycled plastics, polypropylene(PP)and polyethylene (PE), to prepare cotton stalk fiber/plastic composites by hot pressing. The composite panel properties were tested to evaluate the effects caused by the cotton stalk shapes and panel processing factors. The results showed that; 1) The composites made from the cotton stalk particles had better properties than those made from cotton stalk fibers; 2) Density, hot-pressing temperature and the cotton stalk/plastic ratio had a great effect on the cotton-stalk-fiber/polypropylene panel properties. Under optimized conditions, the cotton-stalk-fiber /polypropylene panel properties exceeded the specifications of national standard GB/T 4897. 6-2003,GB/T 4897. 7-2003 for structural particleboards.

  12. Fiber Optic Sensors for Structural Health Monitoring of Air Platforms

    Directory of Open Access Journals (Sweden)

    Jianping Yao

    2011-03-01

    Full Text Available Aircraft operators are faced with increasing requirements to extend the service life of air platforms beyond their designed life cycles, resulting in heavy maintenance and inspection burdens as well as economic pressure. Structural health monitoring (SHM based on advanced sensor technology is potentially a cost-effective approach to meet operational requirements, and to reduce maintenance costs. Fiber optic sensor technology is being developed to provide existing and future aircrafts with SHM capability due to its unique superior characteristics. This review paper covers the aerospace SHM requirements and an overview of the fiber optic sensor technologies. In particular, fiber Bragg grating (FBG sensor technology is evaluated as the most promising tool for load monitoring and damage detection, the two critical SHM aspects of air platforms. At last, recommendations on the implementation and integration of FBG sensors into an SHM system are provided.

  13. Electrospinning: a fascinating fiber fabrication technique.

    Science.gov (United States)

    Bhardwaj, Nandana; Kundu, Subhas C

    2010-01-01

    With the emergence of nanotechnology, researchers become more interested in studying the unique properties of nanoscale materials. Electrospinning, an electrostatic fiber fabrication technique has evinced more interest and attention in recent years due to its versatility and potential for applications in diverse fields. The notable applications include in tissue engineering, biosensors, filtration, wound dressings, drug delivery, and enzyme immobilization. The nanoscale fibers are generated by the application of strong electric field on polymer solution or melt. The non-wovens nanofibrous mats produced by this technique mimics extracellular matrix components much closely as compared to the conventional techniques. The sub-micron range spun fibers produced by this process, offer various advantages like high surface area to volume ratio, tunable porosity and the ability to manipulate nanofiber composition in order to get desired properties and function. Over the years, more than 200 polymers have been electrospun for various applications and the number is still increasing gradually with time. With these in perspectives, we aim to present in this review, an overview of the electrospinning technique with its promising advantages and potential applications. We have discussed the electrospinning theory, spinnable polymers, parameters (solution and processing), which significantly affect the fiber morphology, solvent properties and melt electrospinning (alternative to solution electrospinning). Finally, we have focused on varied applications of electrospun fibers in different fields and concluded with the future prospects of this efficient technology.

  14. Fiber optic spanner

    Science.gov (United States)

    Black, Bryan; Mohanty, Samarendra

    2011-10-01

    Rotation is a fundamental function in nano/biotechnology and is being useful in a host of applications such as pumping of fluid flow in microfluidic channels for transport of micro/nano samples. Further, controlled rotation of single cell or microscopic object is useful for tomographic imaging. Though conventional microscope objective based laser spanners (based on transfer of spin or orbital angular momentum) have been used in the past, they are limited by the short working distance of the microscope objective. Here, we demonstrate development of a fiber optic spanner for rotation of microscopic objects using single-mode fiber optics. Fiber-optic trapping and simultaneous rotation of pin-wheel structure around axis perpendicular to fiber-optic axis was achieved using the fiber optic spanner. By adjusting the laser beam power, rotation speed of the trapped object and thus the microfluidic flow could be controlled. Since this method does not require special optical or structural properties of the sample to be rotated, three-dimensional rotation of a spherical cell could also be controlled. Further, using the fiber optic spanner, array of red blood cells could be assembled and actuated to generate vortex motion. Fiber optical trapping and spinning will enable physical and spectroscopic analysis of microscopic objects in solution and also find potential applications in lab- on-a-chip devices.

  15. Fiber laser performance in industrial applications

    Science.gov (United States)

    McCulloch, S.; Hassey, A.; Harrison, P.

    2013-02-01

    Fiber lasers are competing with the traditional CO2 Laser, Plasma, Water Jet and Press Punch technology. This paper concentrates on the drivers behind the progress that cutting and welding market. Thin metal cutting in this case is defined as below 4mm and the dominant technology has been the Press Punch for higher quality, large volume components and Plasma for lower quality, small quantities. Up until the fiber lasers were commercially available many machine manufacturers were deterred from incorporating lasers due to the technical barriers posed by the lasers available at that time. In particular fiber laser requires no maintenance does not necessitate a beam path to be aligned and kept free of contaminant so have encouraged many traditionally non-laser machine builders to integrate fiber sources into a variety of applications and push the performance envelope. All of the components to build a fibre laser cutting or welding system are now available "off-the shelf" which is even allowing end users to design and build their own systems directly in production environments.

  16. Neural Network-Based Multimode Fiber-Optic Information Transmission

    Science.gov (United States)

    Marusarz, Ronald K.; Sayeh, Mohammad R.

    2001-01-01

    A new technique for transmitting information through multimode fiber-optic cables is presented. This technique sends parallel channels through the fiber-optic cable, thereby greatly improving the data transmission rate compared with that of the current technology, which uses serial data transmission through single-mode fiber. An artificial neural network is employed to decipher the transmitted information from the received speckle pattern. Several different preprocessing algorithms are developed, tested, and evaluated. These algorithms employ average region intensity, distributed individual pixel intensity, and maximum mean-square-difference optimal group selection methods. The effect of modal dispersion on the data rate is analyzed. An increased data transmission rate by a factor of 37 over that of single-mode fibers is realized. When implementing our technique, we can increase the channel capacity of a typical multimode fiber by a factor of 6.

  17. Characterization of new natural cellulosic fiber from Cissus quadrangularis stem.

    Science.gov (United States)

    Indran, S; Raj, R Edwin

    2015-03-01

    Polymer composite has contributed tremendously for energy efficient technologies in automotive and aero industries. Environmental and health concerns related to the carcinogenic nature of artificial fiber in polymer composite needs a retrofit. Eco friendly natural cellulosic fiber extract from the stem of Cissus quadrangularis plant is extensively characterized to consider as a viable alternative for man-made hazardous fibers. Anatomical study, chemical analysis, physical analysis, FTIR, XRD, SEM analysis and thermo gravimetric analysis were done to establish the certainty of using them as reinforcement fiber. Its light weight and the presence of high cellulose content (82.73%) with very little wax (0.18%) provide high specific strength and good bonding properties in composite manufacturing. The flaky honeycomb outer surface revealed through electron microscopy contributes for high modulus in CQ stem fiber and thermo gravimetric analysis ensures thermal stability up to 270 °C, which is within the polymerization process temperature.

  18. Biomass from Paddy Waste Fibers as Sustainable Acoustic Material

    Directory of Open Access Journals (Sweden)

    A. Putra

    2013-01-01

    Full Text Available Utilization of biomass for green products is still progressing in the effort to provide alternative clean technology. This paper presents the utilization of natural waste fibers from paddy as acoustic material. Samples of sound absorbing material from paddy waste fibers were fabricated. The effect of the fiber density, that is, the fiber weight and the sample thickness, and also the air gap on the sound absorption coefficient is investigated through experiment. The paddy fibers are found to have good acoustic performance with normal incidence absorption coefficient greater than 0.5 from 1 kHz and can reach the average value of 0.8 above 2.5 kHz. This result is comparable against that of the commercial synthetic glass wool. Attachment of a single layer of polyester fabric is shown to further increase the absorption coefficient.

  19. Fiber-reinforced composites in fixed partial dentures

    Directory of Open Access Journals (Sweden)

    Vallittu P

    2006-08-01

    Full Text Available Fiber-reinforced composite resin (FRC prostheses offer the advantages of good esthetics, minimal invasive treatment, and an ability to bond to the abutment teeth, thereby compensating for less-than-optimal abutment tooth retention and resistance form. These prostheses are composed of two types of composite materials: fiber composites to build the framework and hybrid or microfill particulate composites to create the external veneer surface. This review concentrates on the use of fiber reinforcement in the fabrication of laboratory or chairside-made composite-fixed partial dentures of conventional preparation. Other applications of FRC in dentistry are briefly mentioned. The possibilities fiber reinforcement technology offers must be emphasized to the dental community. Rather than limiting discussion to whether FRC prostheses will replace metal-ceramic or full-ceramic prostheses, attention should be focused on the additional treatment options brought by the use of fibers. However, more clinical experience is needed.

  20. Applications of Fiber-Reinforced Polymers in Additive Manufacturing

    DEFF Research Database (Denmark)

    Hofstätter, Thomas; Pedersen, David Bue; Tosello, Guido

    2017-01-01

    and Young's modulus. Key challenges in the field, as of now, are proper fiber placement, fiber seizing, an increased knowledge in the used materials and how they are applied into engineering solutions through proper control of the additive manufacturing process. The aim of this research is the improved...... understanding of fiber-reinforcement in additive manufacturing in terms of production and application. Vat polymerization and material extrusion techniques for composite additive manufacturing were investigated with respect of increasing adhesion between the matrix material and the fibers. Process optimization......Additive manufacturing technologies are these years entering the market of functional final parts. Initial research has been performed targeting the integration of fibers into additive manufactured plastic composites. Major advantages, among others, are for example increased tensile strength...