This paper introduces the latest progress in the demodulation techniques of high resolution wavelength-coded optical fber sensor, which are applicable to high performance optical fber strain sensor and sensor array with sub-nano strain resolution. This paper frst reviews and discusses the classical FBG strain sensing technique and introduces the optimized sensing elements in high resolution optical fber strain sensing systems; then presents the authors' recent works on demodulation methods for high resolution optical fber sensors, including a feed-forward frequency-swept laser linewidth compression technique and a closed-loop cyclic interrogation technique in detail. Finally, we introduces an implementation of the high resolution optical fber sensors in the observation of crustal deformation, providing an example for other related research and application scenarios.
CHEN Jiageng, LIU Qingwen, ZHAO Shuangxiang, He Zuyuan
. Progress in High Resolution Demodulation Techniquesfor Wavelength-Encoded Optical Fiber Sensor[J]. Journal of Applied Sciences, 2020
, 38(2)
: 279
-295
.
DOI: 10.3969/j.issn.0255-8297.2020.02.005
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