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检索条件"任意字段=Advanced Sensor Systems and Applications II"

共 336 条记录，以下是251-260 订阅

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Fiber Bragg grating sensor for the measurement of elevated temperature

Fiber Bragg grating sensor for the measurement of elevated t...

引用

Conference on advanced sensor systems and applications ii

作者： Zhang, YG Xiang, SQ He, H Zhu, R Wang, XZ Chinese Acad Sci Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)081945589X

A novel fiber Bragg grating (FBG) sensor for the measurement of high temperature is studied. The sensing head is comprised of one FBG and two metal strips with different lengths and different coefficients of thermal-expansion (CTE). The temperature to be measured can be converted into the strain of the FBG. One can know the temperature according to the peak wavelength shift of the FBG induced by the strain. A dynamic range of 800 degrees C and a resolution of 1 degrees C can be obtained by this sensor system. The experiment results well agree with the theoretical analysis.

关键词： sensor fiber Bragg grating high temperature metal thermal-expansion

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Investigation of fiber Bragg grating temperature sensors for applications in electric power systems

Investigation of fiber Bragg grating temperature sensors for...

引用

Conference on advanced sensor systems and applications ii

作者： Lee, H Jin, Z Song, M Chonbuk Natl Univ Div Elect & Informat Engn Chonju 561756 South Korea

ISBN: (纸本)081945589X

A reliable distributed temperature monitoring is very important for electric power systems because a power system failure will result in an enormous loss of life and property. Fiber Bragg grating (FBG) sensors, which have been studied intensively for last decade, can be very efficient tools for these applications because they are immune to EMI and can be highly multiplexed, which enables efficient quasi-distributed temperature sensing along tens of kin range. We constructed a FBG sensor array system for temperature monitoring of power cables. For reliable sensor implementation, the FBG array is embedded in a metal tube which protects sensors from external disturbances and enables easy installment by soldering. The temperature-induced Bragg wavelength variations are accurately monitored by a scanned tunable wavelength filter. Differential measurement with a temperature stabilized reference grating and a curve fitting algorithm has been used to enhance measurement accuracy in temperature range of 25 degrees C similar to 70 degrees C.

关键词： fiber Bragg grating temperature sensor Fabry-Perot filter

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Signal detection scheme for high precision Sagnac temperature sensor

Signal detection scheme for high precision Sagnac temperatur...

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Conference on advanced sensor systems and applications ii

作者： Yang, YH Meng, GW Jia, Y Beijing Univ Aeronaut & Astronaut Inst Optoelect Technol Beijing 100083 Peoples R China

ISBN: (纸本)081945589X

A temperature sensor based on polarization non-reciprocity in fiber Sagnac interferometer was proposed and investigated theoretically and experimentally. Special signal detection schemes were proposed and an experimental system with an all polarization configuration was setup. The temperature measurement experiment was done within - 40 degrees C similar to +60 degrees C range and the stability were investigated at absolute 0 degrees C in mixture of ice and water respectively. The result agrees with theory well and good performance has been obtained with parameters optimized. Discussion shows that this kind of temperature sensor can achieve high precision and has great application potential.

关键词： polarization non-reciprocity fiber Sagnac interferometer temperature sensor

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High sensitive coupling evanescent wave temperature sensor

High sensitive coupling evanescent wave temperature sensor

引用

Conference on advanced sensor systems and applications ii

作者： Bao, HY Wang, TY Shen, YQ Shanghai Univ Shanghai Key Lab Special Fiber Opt Shanghai 201800 Peoples R China

ISBN: (纸本)081945589X

An optical fiber temperature sensor based on optical fiber coupler and evanescent wave is presented. The overall goal of our research is to design a temperature sensor system which is used to monitor temperature accurately. Coupler is used as the sensor probe. Such kind of coupler uses standard communication SM fiber to be a sensing component of evanescent wave. The probe is obtained by replacing the cladding of coupler region with temperature sensitive material. The whole system is then exposed in a thermal bath. A numerical modeling of the sensor based on supermode theory is studied and the result is simulated. At last, the system for temperature measurement in experiment is simply described.

关键词： coupler evanescent wave SM fiber supermode

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A coarse wavelength-division-multiplexed extrinsic fiber Fabry-Perot sensor system

A coarse wavelength-division-multiplexed extrinsic fiber Fab...

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Conference on advanced sensor systems and applications ii

作者： Zhou, CX Rao, YJ Jiang, J Chongqing Univ Opt Fiber Technol Grp Dept Optoelect Engn Chongqing 400044 Peoples R China

ISBN: (纸本)081945589X

In this paper, a novel method for multiplexing extrinsic fiber Fabry-Perot interferometric sensors (EFPIs) using the coarse wavelength-division-multiplexing technology (CWDM) is proposed and demonstrated, for the first time to our knowledge. The system and principle for sensing and multiplexing are described. A 1x4 CWDM is used to multiplex signals from four EFPIs with identical cavity length. The experimental results show that a strain accuracy of +/- 2.5 mu epsilon is achieved. There is little cross-talk between adjacent sensor channels. This system improves the multiplexing capability of EFPIs by a factor of four. It is anticipated that such a sensor system could find important applications in smart materials and health monitoring for large structures.

关键词： Fabry-Perot interferometer optical fiber sensor multiplexing CWDM strain gauge

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Progress of optical sensor system for health monitoring of bridges at Chongqing University

Progress of optical sensor system for health monitoring of b...

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Conference on advanced sensor systems and applications ii

作者： Chen, W Fu, Y Zhu, Y Huang, S Chongqing Univ Dept Optoelect Engn Chongqing 400044 Peoples R China

ISBN: (纸本)081945589X

With decades of research experience on optical sensors, Optoelectronic Technology Lab of Chongqing University (OTLCU) has studied on a variety of sensors system designed for practical use in health monitoring. In OTLCU, embedded and surface mounted fiber Fabry-Perot strain sensor has been developed for monitoring the local strain of both concrete and steel truss bridge. Optoelectronic deflect meter, with a group of optical level sensor in a series connected pipe, was developed for deflection monitoring and line shape monitoring of the bridges. Laser deflect meter, with a laser pointer and a sensors array, has been also developed for a dynamic deflection monitoring of the bridges. To monitoring the 2-Dimentional displacement of the bridge, a self-calibrating imaging system was developed. All these sensor systems have been applied in different bridges successfully. This paper briefly describes principle of these optical sensing systems, and also gives some representative results of the system in practical application of bridges.

关键词： optical sensor health monitoring bridges Chongqing University

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Modeling of subwavelength-diameter optical wire waveguides for optical sensing applications

Modeling of subwavelength-diameter optical wire waveguides f...

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Conference on advanced sensor systems and applications ii

作者： Tong, LM Lou, JY Mazur, E Zhejiang Univ State Key Lab Modern Opt Instrumentat Hangzhou 310027 Peoples R China

ISBN: (纸本)081945589X

Low-loss optical wave guiding along a subwavelength-diameter silica wire leaves a large amount of the guided field outside the solid core as evanescent wave and at the same time maintains the coherence of the fight, making it possible to develop sensitive and miniaturized optical sensors for physical, chemical and biological applications. Here we introduce, for the first time to our knowledge, a scheme to develop optical sensors based on evanescent-wave-guiding properties of sub wavelength-diameter wires. Optical wave guiding properties of these wires that are pertinent to a waveguide sensor, such as single-mode condition, evanescent field, Poynting vector and optical loss are investigated. By measuring the phase shift of the guided light, we propose a Mach-Zehnder-type sensor assembled with two silica wires. The sensitivity and size of the sensor are also estimated, which shows that, sub wavelength-diameter silica wires are promising for developing optical sensors with high sensitivity and small size.

关键词： optical sensor evanescent field sub wavelength-diameter silica nanowire wire waveguide sensitivity miniaturization

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A low-cost multimode fiber Bragg grating sensor system

A low-cost multimode fiber Bragg grating sensor system

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Conference on advanced sensor systems and applications ii

作者： Liu, TY Wang, DR Raenaei, R Chen, XF Zhang, L Bennion, I Intelligent Sensor Syst Ltd Uxbridge UB8 3PQ Middx England

ISBN: (纸本)081945589X

A low-cost fiber optic sensor system based on multimode fiber and an LED light source is presented. A multimode fiber Bragg grating (MMFBG) element is used as a strain sensor. In a matched grating scheme, a MMFBG similar to the sensing one was used as a reference in the receiving unit. For detection of large wavelength shift we demonstrated the feasibility of MMFBG wavelength detection using a single mode fiber fused coupler edge filter. The high cost normally associated with wavelength interrogators for single mode fiber FBG sensors was overcome by the utilization of a low cost multimode fiber pigtailed LED light source. The multimode fiber sensing system has the potential of maintaining much of the advantages of its single mode FBG sensor system counterparts. The MMFBG sensing schemes could be used for short distance, high sensitivity, high speed, strain, temperature and acoustic sensing applications.

关键词： fiber Bragg grating multimode sensor edge filter passive detection

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Optical sensor based on hybrid LPG/FBG in D-fiber for simultaneous refractive index and temperature measurement

Optical sensor based on hybrid LPG/FBG in D-fiber for simult...

引用

Conference on advanced sensor systems and applications ii

作者： Chen, XF Zhou, KM Zhang, L Bennion, I Liu, TY Aston Univ Photon Res Grp Birmingham B4 7ET W Midlands England

ISBN: (纸本)081945589X

A dual-parameter optical sensor has been realized by UV-writing a long-period and a Bragg grating structure in D-fiber. The hybrid configuration permits the detection of the temperature from the latter and measuring the external refractive index from the former responses, respectively. The employment of the D-fiber allows as effective modification and enhancement of the device sensitivity by cladding etching. The grating sensor has been used to measure the concentrations of aqueous sugar solutions, demonstrating the potential capability to detect concentration changes as small as 0.01%.

关键词： optical sensor D-fiber etching hybrid LPG/FBG external refractive index temperature

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A novel method of temperature compensation for micro-vibration sensor with fiber gratings

A novel method of temperature compensation for micro-vibrati...

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Conference on advanced sensor systems and applications ii

作者： Dong, XF Huang, YL Liu, B Zhang, WG Kai, GY Dong, XY Nankai Univ Inst Modern Opt Tianjin 300071 Peoples R China

ISBN: (纸本)081945589X

A technique for temperature compensation in fiber grating vibration sensor is reported. By special design, it causes reversed strain on two FBGs and has temperature effects cancelled. After discussion about the factors affecting the sensitivity and the width of frequency band, it is experimentally proved that the total variation in wavelength difference within temperature of -15 similar to 50 degrees C is nearly 0. When the input vibration frequency is up to 800Hz and the drive power is as low as 2mw, the output waveform is still distortionless.

关键词： optoelectronics fiber Bragg grating(FBG) temperature compensation vibration sensor

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