A multiplexed white light interferometric fiber optic twin-sensor-array was designed to monitor the structural health of large buildings.In this sensing system,based on a Michelson interferometer,an optical path match...A multiplexed white light interferometric fiber optic twin-sensor-array was designed to monitor the structural health of large buildings.In this sensing system,based on a Michelson interferometer,an optical path matching technique is used to demodulate each twin-sensor.Each twin-sensor-array consists of a 2×N sensing element linked by a 3 dB coupler.When one of the twin-sensor is used to measure strain,variations caused by temperature can be compensated for by referencing the other twin-sensor.The multiplexing capacity of the sensing scheme has been analyzed and experimental results with a 2×3 twin-sensor-array are given.展开更多
Based on the theory of fiber Bragg grating sensing,and using a 2 m plane stress material model of the simulation experiment,the wavelength shift regulations of fi- ber Bragg gratings under rock settlement deformation ...Based on the theory of fiber Bragg grating sensing,and using a 2 m plane stress material model of the simulation experiment,the wavelength shift regulations of fi- ber Bragg gratings under rock settlement deformation conditions were got,which provided reliable basis for the design of the wavelength bandwidth of sensing gratings.The wave- length increase when the rock layers are under tension,and decrease under compression. Compressive strain sensitivity is bigger than tensile strain sensitivity when the load is lower.However compressive strain sensitivity is smaller than tensile strain sensitivity when the load is higher.Experimental result coincides well with theory.The wavelength band- width of two neighboring fiber Bragg gratings of the gratings used for monitoring the de- formation of rock layer should be no less than 6 nm.An effective new approach for de- tecting the deformation of rock settlement with fiber Bragg gratings is provided.展开更多
This special issue in the Journal of Electronic Science ＆ Technology of China （JESTC） contains the selected papers presented at the 1st Asia-Pacific Optical Fiber Sensors Conference （APOS2008） organized by Univer...This special issue in the Journal of Electronic Science ＆ Technology of China （JESTC） contains the selected papers presented at the 1st Asia-Pacific Optical Fiber Sensors Conference （APOS2008） organized by University of Electronic Science and Technology of China and Chongqing University, China. This conference is supported by Ministry of Education of the People＇s Republic of China, National Nature Science Foundation of China （NSFC）, and Chinese Optics Society （COS）.展开更多
基金National Natural Science Foundation of China(60577005)Specialized Research Fund for the Doctoral Program of Higher Education Institute of MOE,China,to Harbin Engineering University
文摘A multiplexed white light interferometric fiber optic twin-sensor-array was designed to monitor the structural health of large buildings.In this sensing system,based on a Michelson interferometer,an optical path matching technique is used to demodulate each twin-sensor.Each twin-sensor-array consists of a 2×N sensing element linked by a 3 dB coupler.When one of the twin-sensor is used to measure strain,variations caused by temperature can be compensated for by referencing the other twin-sensor.The multiplexing capacity of the sensing scheme has been analyzed and experimental results with a 2×3 twin-sensor-array are given.
基金the National Natural Science Foundation of China(50775060)
文摘Based on the theory of fiber Bragg grating sensing,and using a 2 m plane stress material model of the simulation experiment,the wavelength shift regulations of fi- ber Bragg gratings under rock settlement deformation conditions were got,which provided reliable basis for the design of the wavelength bandwidth of sensing gratings.The wave- length increase when the rock layers are under tension,and decrease under compression. Compressive strain sensitivity is bigger than tensile strain sensitivity when the load is lower.However compressive strain sensitivity is smaller than tensile strain sensitivity when the load is higher.Experimental result coincides well with theory.The wavelength band- width of two neighboring fiber Bragg gratings of the gratings used for monitoring the de- formation of rock layer should be no less than 6 nm.An effective new approach for de- tecting the deformation of rock settlement with fiber Bragg gratings is provided.
文摘This special issue in the Journal of Electronic Science ＆ Technology of China （JESTC） contains the selected papers presented at the 1st Asia-Pacific Optical Fiber Sensors Conference （APOS2008） organized by University of Electronic Science and Technology of China and Chongqing University, China. This conference is supported by Ministry of Education of the People＇s Republic of China, National Nature Science Foundation of China （NSFC）, and Chinese Optics Society （COS）.
