基于光纤光栅传感理论设计了一种应用于周界安防的低频振动传感器。采用商用解调仪OPD4000对传感器的灵敏度进行了测试, 在10~100Hz频率范围内, 传感器灵敏度高于1000pm/g。基于非平衡迈克尔逊干涉仪相位载波调制（PGC）解调技术搭建了一套光栅传感器解调系统, 实现对传感器低频振动信号的高精度实时解调, 使得该系统可广泛应用于机场、监狱、油库、核场所等重要区域的周界安防中。

A novel low frequency vibration sensor for perimeter security was designed based on fiber Bragg grating sensing technology. The sensor was tested using a commercial demodulator OPD4000. The frequency response range is from 10 to 100Hz and the acceleration of the FBG vibration sensor is over 1000pm/g and a phase generated carrier (PGC) demodulator based on an unbalanced Michelson interferometer was proposed. The high precision and real time signal detection were realized for this FBG vibration sensor. So it can be used in a variety of fields such as airports, prisons, oil deport,and nuclear sites of the perimeter security technology.