A high sensitive fiber Bragg grating(FBG) geophone detecting system

Jin-Yu Wang; Hai-Feng Qi; Guang-Dong Song; Chang Wang; Tong-Yu Liu

doi:10.1117/12.914245

30 January 2012 A high sensitive fiber Bragg grating(FBG) geophone detecting system

Jin-Yu Wang, Hai-Feng Qi, Guang-Dong Song, Chang Wang, Tong-Yu Liu

Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 83511D (2012) https://doi.org/10.1117/12.914245
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

Abstract

A high sensitive fiber Bragg grating (FBG) geophone detecting system based on narrow line width distributed feedback (DFB) laser is realized by using filtering demodulation. Sensitivity of FBG geophone lies on the structure of the sensor shell and the shape of the reflectivity spectrum of FBG. Experiments on the detecting system's frequency character have been done. Results show that this geophone can detect the smallest acceleration of 1mm/s2 with a flat response from 5Hz to 40Hz.. The experiments on coal mine exhibit that the geophone can be used to measure microseismic signals. The detecting system shows great prospect in micro-seismic detection, and geological disasters detecting.

Citation Download Citation

Jin-Yu Wang, Hai-Feng Qi, Guang-Dong Song, Chang Wang, and Tong-Yu Liu "A high sensitive fiber Bragg grating(FBG) geophone detecting system", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83511D (30 January 2012); https://doi.org/10.1117/12.914245

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