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Proceedings Paper

A high spatial resolution distributed optical fiber grating sensing system based on OFDR
Author(s): Ke Dong; Yuchuan Xiong; Hongqiao Wen; Xinlin Tong; Cui Zhang; Chengwei Deng
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Paper Abstract

A distributed optical fiber grating sensing system with large capacity and high spatial resolution is presented. Since highdensity identical weak grating array was utilized as sensing fiber, the multiplexing number was greatly increased, meanwhile, optical frequency domain reflectometry (OFDR) technology was used to implement high resolution distributed sensing system. In order to eliminate the nonlinear effect of tunable light source, a windowed FFT algorithm based on cubic spline interpolation was applied. The feasibility of the algorithm was experimentally testified, ultimately, the spatial resolution of system can reach mm-level. The influence of the crosstalk signal in the grating array on the OFDR system was analyzed. A method that a long enough delay fiber was added before the first FBG to remove crosstalk signal was proposed. The experiment was verified using an optical fiber with 113 uniform Bragg gratings at an interval of 10cm whose reflectivity are less than 1%. It demonstrates that crosstalk signal and measurement signal can be completely separated in the distance domain after adding a long enough delay fiber. Finally, the temperature experiment of distributed grating sensing system was carried out. The results display that each raster’s center wavelength in the fiber link is independent of each other and the center wavelength drift has a good linear relationship with the temperature. The sensitivity of linear fitting is equal to 11.1pm/°C.

Paper Details

Date Published: 24 October 2017
PDF: 4 pages
Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 1046404 (24 October 2017); doi: 10.1117/12.2282254
Show Author Affiliations
Ke Dong, Wuhan Univ. of Technology (China)
Yuchuan Xiong, Wuhan Univ. of Technology (China)
Hongqiao Wen, Wuhan Univ. of Technology (China)
Xinlin Tong, Wuhan Univ. of Technology (China)
Cui Zhang, Wuhan Univ. of Technology (China)
Chengwei Deng, Wuhan Univ. of Technology (China)

Published in SPIE Proceedings Vol. 10464:
AOPC 2017: Fiber Optic Sensing and Optical Communications
Zi-Sen Zhao; Leping Wei; Yanbiao Liao; Weixu Zhang; Desheng Jiang; Wei Wang; Kenneth T. V. Grattan, Editor(s)

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