This paper presents an extrinsic Fabry-Perot (F-P) cavity optical fiber temperature sensor, which is based on the frequency-modulated continuous-wave laser interference. The temperature sensing probe is fabricated by a stainless-steel tube with high coefficient of thermal expansion to encapsulate the F-P cavity. Stainless steel tube is used as the F-P cavity and also the temperature sensitive component. The variation of cavity length caused by thermal expansion of F-P cavity is measured by frequency-modulated continuous-wave interferometric measurement technique. The experimental results show that the temperature measurement resolution of the fiber temperature sensor reached 0.0002 ℃ and the temperature measurement sensitivity reached 3022 nm/℃. The temperature sensor not only has high sensitivity and resolution, but also has a simple and stable structure and a good application prospect.
Frequency-modulated continuous-wave laser interferometric optical fiber temperature sensor
First published at:May 01, 2019
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Shaanxi Provincial Key Laboratory of Photoelectric Testing and Instrument Technology Open Fund Project (2015SZSJ-60-3)
Get Citation: Wang Huan, Zheng Gang, Chen Haibin, et al. Frequency-modulated continuous-wave laser interferometric optical fiber temperature sensor[J]. Opto-Electronic Engineering, 2019, 46(5): 180506.