Abstract
The fiber Bragg grating geophone sensor with higher sensitivity and wider frequency range was reported. The methods to increase the sensitivity of the FBG cantilever sensor were presented. The acceleration sensitivity of the optimized FBG geophone is 220pm/g, and the resonant frequency can reach to 295Hz. The experiments show that the FBG geophone system has the minimum detectable acceleration of 1mm/s2. Some factual application examples of using this fiber Bragg grating geophone monitoring system for micro seismic monitoring in coal mine were presented.
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