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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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Abstract

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/με were achieved.

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DOI:10.1364/PRJ.391160

所属栏目:Fiber Optics and Optical Communications

基金项目:Hong Kong Polytechnic University10.13039/501100004377; National Natural Science Foundation of China10.13039/501100001809;

收稿日期:2020-02-24

录用日期:2020-05-12

网络出版日期:2020-05-13

作者单位    点击查看

Chengang Lyu:School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Ziqi Liu:School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Ziqiang Huo:School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Chunfeng Ge:School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
Xin Cheng:Photonics Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
Haw-Yaw Tam:Photonics Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China

联系人作者:Xin Cheng(eechengx@polyu.edu.hk)

备注:Hong Kong Polytechnic University10.13039/501100004377; National Natural Science Foundation of China10.13039/501100001809;

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引用该论文

Chengang Lyu, Ziqi Liu, Ziqiang Huo, Chunfeng Ge, Xin Cheng, and Haw-Yaw Tam, "High-sensitivity, high-spatial-resolution distributed strain sensing based on a poly(methyl methacrylate) chirped fiber Bragg grating," Photonics Research 8(7), 1134-1139 (2020)

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