High-sensitivity, high-spatial-resolution distributed strain sensing based on a poly(methyl methacrylate) chirped fiber Bragg grating

查看全文 作　　者：Chengang [1]Lyu;Ziqi [1]Liu;Ziqiang [1]Huo;Chunfeng [2]Ge;Xin [3]Cheng;Haw-Yaw [3]Tam

机构地区：[1]School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;[2]School of Precision Instruments and Opto-electronics Engineering,Tianjin University,Tianjin 300072,China;[3]Photonics Research Center,The Hong Kong Polytechnic University,Kowloon,Hong Kong,China

出　　处：《Photonics Research》索引2020年第8卷第7期,共6页

基　　金：The Hong Kong Polytechnic University(1-ZVGB);National Natural Science Foundation of China(61205075)。 摘　　要：In this study,a high-sensitivity,high-spatial-resolution distributed strain-sensing approach based on a poly(methyl methacrylate)chirped fiber Bragg grating(CFBG)is proposed and experimentally demonstrated.Linearly chirped FBGs in a polymer optical fiber provide an alternative to the silica fiber owing to the lower Young’s modulus,which can yield a higher stress sensitivity under the same external force.According to the spatial wavelength-encoded characteristic of the CFBG,a fully distributed strain measurement can be achieved by optical frequency-domain reflectometry.Through time-/space-resolved short-time Fourier transform,the applied force can be located by the beat frequency originated from the space-induced time delay and measured by the differential frequency offset originated from the strain-induced dispersion time delay.In a proof-of-concept experiment,a high spatial resolution of 1 mm over a gauge length of 40 mm and a strain resolution of 0.491 Hz/μεwere achieved. 关键词：OFFSET fiber RESOLUTION

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High-sensitivity, high-spatial-resolution distributed strain sensing based on a poly(methyl methacrylate) chirped fiber Bragg grating

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