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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1 000pm/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。
Based on the theory of fiber grating sensing, a low frequency vibration sensor used in perimeter security is designed. The sensitivity of the sensor was tested with the OPD4000, a commercial demodulator. The sensitivity of the sensor is higher than 1 000pm / g over the frequency range of 10 ~ 100Hz. Based on unbalance Michelson interferometer phase carrier modulation (PGC) demodulation technology, a grating sensor demodulation system is set up to realize high-precision real-time demodulation of low-frequency vibration signals of sensors. The system can be widely used in airports, prisons, Oil depots, nuclear establishments and other important areas of perimeter security.