The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Xiaoyi Bao - One of the best experts on this subject based on the ideXlab platform.
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brillouin spectrum in leaf and simultaneous temperature and Strain Measurement
Journal of Lightwave Technology, 2012Co-Authors: Xuan Liu, Xiaoyi BaoAbstract:The triangle refractive index profile of LEAF fiber (a non-zero dispersion shifted fiber) makes it much more sensitive to temperature and Strain. Owing to its high stimulated Brillouin scattering (SBS) threshold for long distance distributed sensors, we studied the Brillouin spectrum characteristics of LEAF under different Strain and temperature conditions. The results are compared with those of SMF-28. Based on the linear relationship between the four peaks' linewidth/peak frequency and Strain/temperature, we achieved a Strain error of 37 μe and a temperature error of 1.8°C with a spatial resolution of 4 m for simultaneous temperature and Strain Measurement.
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Strain Measurement of the steel beam with the distributed Brillouin scattering sensor
Health Monitoring and Management of Civil Infrastructure Systems, 2001Co-Authors: Xiaoyi Bao, Michael D. Demerchant, Anthony W. Brown, T. BrennerAbstract:This paper has demonstrated the structural Strain Measurement of the steel beam with the distributed fiber optical sensor system based on Brillouin scattering. The experiments were conducted both in the lab and in outdoor conditions. When it is in outdoor environment, the temperature compensation must be taken into account for the sunlight radiation effects. The compressive Strain can be measured without need of the pre-tension on the fiber. The spatial resolution of the Strain Measurement is 0.5 m. The Strain Measurement accuracy is 10 (mu) (epsilon) for the lab environment.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Michael D. Demerchant - One of the best experts on this subject based on the ideXlab platform.
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tensile and compressive Strain Measurement in the lab and field with the distributed brillouin scattering sensor
Journal of Lightwave Technology, 2001Co-Authors: Michael D. Demerchant, Anthony W. Brown, T W BremnerAbstract:The structural Strain Measurement of tension and compression in the steel beam was demonstrated with a distributed fiber-optic sensor system based on Brillouin scattering. The experiments were conducted both in the laboratory and outdoors. When it is in the outdoor environment, the temperature compensation has been taken into account for the Strain Measurement due to sunlight radiation. The compressive Strain has been measured, without needing pretension on the fiber with a Brillouin scattering-based distributed sensor system, when the fiber is glued to the steel beam at every point. The dynamic range in the Strain Measurement has been increased, due to the elimination of the pretension requirement. The spatial resolution of the Strain Measurement is 0.5 m. The Strain Measurement accuracy is /spl plusmn/10 /spl mu//spl epsi/(/spl mu/m/m) in the laboratory environment with nonuniform-distributed Strain. With uniform Strain distribution, the Strain accuracy for this system can be. /spl sim//spl plusmn/5 /spl mu//spl epsi/. These results were achieved with the introductions of a computer-controlled polarization controller, a fast digitizer-signal averager, a pulse duration control, and the electrical optical modulator bias setting in the software.
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Strain Measurement of the steel beam with the distributed Brillouin scattering sensor
Health Monitoring and Management of Civil Infrastructure Systems, 2001Co-Authors: Xiaoyi Bao, Michael D. Demerchant, Anthony W. Brown, T. BrennerAbstract:This paper has demonstrated the structural Strain Measurement of the steel beam with the distributed fiber optical sensor system based on Brillouin scattering. The experiments were conducted both in the lab and in outdoor conditions. When it is in outdoor environment, the temperature compensation must be taken into account for the sunlight radiation effects. The compressive Strain can be measured without need of the pre-tension on the fiber. The spatial resolution of the Strain Measurement is 0.5 m. The Strain Measurement accuracy is 10 (mu) (epsilon) for the lab environment.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
T W Bremner - One of the best experts on this subject based on the ideXlab platform.
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tensile and compressive Strain Measurement in the lab and field with the distributed brillouin scattering sensor
Journal of Lightwave Technology, 2001Co-Authors: Michael D. Demerchant, Anthony W. Brown, T W BremnerAbstract:The structural Strain Measurement of tension and compression in the steel beam was demonstrated with a distributed fiber-optic sensor system based on Brillouin scattering. The experiments were conducted both in the laboratory and outdoors. When it is in the outdoor environment, the temperature compensation has been taken into account for the Strain Measurement due to sunlight radiation. The compressive Strain has been measured, without needing pretension on the fiber with a Brillouin scattering-based distributed sensor system, when the fiber is glued to the steel beam at every point. The dynamic range in the Strain Measurement has been increased, due to the elimination of the pretension requirement. The spatial resolution of the Strain Measurement is 0.5 m. The Strain Measurement accuracy is /spl plusmn/10 /spl mu//spl epsi/(/spl mu/m/m) in the laboratory environment with nonuniform-distributed Strain. With uniform Strain distribution, the Strain accuracy for this system can be. /spl sim//spl plusmn/5 /spl mu//spl epsi/. These results were achieved with the introductions of a computer-controlled polarization controller, a fast digitizer-signal averager, a pulse duration control, and the electrical optical modulator bias setting in the software.
Nobuo Takeda - One of the best experts on this subject based on the ideXlab platform.
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on board Strain Measurement of a cryogenic composite tank mounted on a reusable rocket using fbg sensors
Structural Health Monitoring-an International Journal, 2006Co-Authors: Tadahito Mizutani, Nobuo Takeda, Hajime TakeyaAbstract:This article presents the real-time Strain Measurement of a composite liquid hydrogen (LH2) tank using fiber Bragg grating (FBG) sensors. The tank was composed of carbon fiber reinforced plastic (C...
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temperature compensated Strain Measurement using fiber bragg grating sensors embedded in composite laminates
Smart Materials and Structures, 2003Co-Authors: Nobuhira Tanaka, Yoji Okabe, Nobuo TakedaAbstract:For accurate Strain Measurement by fiber Bragg grating (FBG) sensors, it is necessary to compensate the influence of temperature change. In this study two devices using FBG sensors have been developed for temperature-compensated Strain Measurement. They are named 'hybrid sensor' and 'laminate sensor', respectively. The former consists of two different materials connected in series: carbon fiber reinforced plastic (CFRP) and glass fiber reinforced plastic. Each material contains an FBG sensor with a different Bragg wavelength, and both ends of the device are glued to a structure. Using the difference of their Young's moduli and coefficients of thermal expansion, both Strain and temperature can be measured. The latter sensor is a laminate of two 90° plies of CFRP and an epoxy plate, and an FBG sensor is embedded in the epoxy plate. When the temperature changes, the cross section of the optical fiber is deformed by the thermal residual stress. The deformation of the fiber causes the birefringence and widens the reflection spectrum. Since the temperature can be calculated from the spectrum width, which changes in proportion to the temperature, the accuracy of the Strain Measurement is improved. The usefulness of these sensors was experimentally confirmed.
Anthony W. Brown - One of the best experts on this subject based on the ideXlab platform.
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tensile and compressive Strain Measurement in the lab and field with the distributed brillouin scattering sensor
Journal of Lightwave Technology, 2001Co-Authors: Michael D. Demerchant, Anthony W. Brown, T W BremnerAbstract:The structural Strain Measurement of tension and compression in the steel beam was demonstrated with a distributed fiber-optic sensor system based on Brillouin scattering. The experiments were conducted both in the laboratory and outdoors. When it is in the outdoor environment, the temperature compensation has been taken into account for the Strain Measurement due to sunlight radiation. The compressive Strain has been measured, without needing pretension on the fiber with a Brillouin scattering-based distributed sensor system, when the fiber is glued to the steel beam at every point. The dynamic range in the Strain Measurement has been increased, due to the elimination of the pretension requirement. The spatial resolution of the Strain Measurement is 0.5 m. The Strain Measurement accuracy is /spl plusmn/10 /spl mu//spl epsi/(/spl mu/m/m) in the laboratory environment with nonuniform-distributed Strain. With uniform Strain distribution, the Strain accuracy for this system can be. /spl sim//spl plusmn/5 /spl mu//spl epsi/. These results were achieved with the introductions of a computer-controlled polarization controller, a fast digitizer-signal averager, a pulse duration control, and the electrical optical modulator bias setting in the software.
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Strain Measurement of the steel beam with the distributed Brillouin scattering sensor
Health Monitoring and Management of Civil Infrastructure Systems, 2001Co-Authors: Xiaoyi Bao, Michael D. Demerchant, Anthony W. Brown, T. BrennerAbstract:This paper has demonstrated the structural Strain Measurement of the steel beam with the distributed fiber optical sensor system based on Brillouin scattering. The experiments were conducted both in the lab and in outdoor conditions. When it is in outdoor environment, the temperature compensation must be taken into account for the sunlight radiation effects. The compressive Strain can be measured without need of the pre-tension on the fiber. The spatial resolution of the Strain Measurement is 0.5 m. The Strain Measurement accuracy is 10 (mu) (epsilon) for the lab environment.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
