Journal of Shanghai Jiao Tong University ›› 2022, Vol. 56 ›› Issue (2): 214-222.doi: 10.16183/j.cnki.jsjtu.2020.313

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Decoupling of Vibration and Temperature Signals of Fiber Bragg Grating Sensor

LI Han, ZHANG Botao, WANG Junjie, SUN Yunda, GONG Shengjie   

  1. School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2020-09-29 Online:2022-02-28 Published:2022-03-03


This paper uses a single fiber bragg grating (FBG) sensor to implement an experiment to measure vibration and temperature signals at the same time, and proposes a MATLAB-based decoupling method to separate vibration and temperature signals. The experimental results show that under the condition of single signal measurement, the static temperature measurement error of the FBG sensor is within ±0.4 ℃ and the relative error of the dynamic measurement of the main frequency of vibration is 0.5%. The FBG sensor measures the composite signal of vibration and temperature. The relative error of the main vibration frequency obtained by the decoupling method proposed in this experiment is 0.65%, the relative error of the vibration amplitude is 7.14%, and the temperature signal error is within ±3.3 ℃.

Key words: nuclear power plant signal monitoring, fiber bragg grating (FBG) sensor, signal decoupling

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