Abstract
In this paper we report the development and test of a high sensitivity fiber Bragg grating (FBG) seismic sensor system for intrusion detection application. A high sensitivity FBG seismic sensor is designed and its sensitivity is above 1000pm/g. Unbalanced Michelson interferometer and Phase generated carrier(PGC) algorithm are adopted by the demodulation system. The system noise is below 10-3 pm/ √Hz and the minimum detectable seismic signal is below 1μg√Hz . The FBG seismic sensor has a maximum detection range of about 70 meters for human and about 200 meters for small wheeled vehicle.
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