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A hybrid FP-FBG fibre sensor for simultaneous strain and temperature measurement

HE WEI1,2, ZHAO JIAQI1, ZHU LIANQING1,2,* , ZHANG WEN1,2, DONG MINGLI1,* , LIU FENG1

Affiliation

  1. Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science & Technology University, Beijing, 100192, China
  2. Beijing Laboratory of Optical Fiber Sensing and System, Beijing Information Science & Technology University, Beijing, 100016, China

Abstract

A hybrid optical fibre sensor composed of a fibre Bragg grating (FBG) and Fabry-Perot (FP) cavity fabricated by chemical etching was proposed for dual-parameter measurement. The temperature characteristics were measured over the range 30–100 C. The spectrum of the FP cavity did not shift with temperature, but the sensitivity of the FBG was 9.5 pm/C (linearity, 0.9994). The sensor showed excellent repeatability. Its strain behaviour was examined in the range 0–550 . For the FP cavity, the loading and unloading strain sensitivities were 2.8 and 3pm/, respectively (linearity > 0.9539); for the FBG, these values were both 1.3 pm/ (linearity > 0.9994)..

Keywords

Fabry-Perot, FBG, Chemical etching, Temperature, Strain, Dual-parameter.

Citation

HE WEI, ZHAO JIAQI, ZHU LIANQING, ZHANG WEN, DONG MINGLI, LIU FENG, A hybrid FP-FBG fibre sensor for simultaneous strain and temperature measurement, Optoelectronics and Advanced Materials - Rapid Communications, 13, 9-10, September-October 2019, pp.495-501 (2019).

Submitted at: Oct. 19, 2018

Accepted at: Oct. 9, 2019