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设计了一种基于柔性铰链结构的光纤光栅加速度传感器,进行了结构理论分析,并构建有限元模型仿真分析了传感器的加速度传感特性。基于F-P滤波器构建了具有温度自补偿功能的光纤光栅加速度检测系统,并通过增加反馈控制电路,对F-P滤波器进行反馈控制,实现了系统的零点自温度补偿。对系统的特性进行了实验测试,结果表明:系统对加速度的连续激励信号和冲击激励信号均有良好的动态响应,系统的固有频率为380.0Hz,动态响应范围可达65.6dB,频率响应范围为10.0~240.0 Hz,灵敏度为236 pm/g,所设计的加速度传感器具有较强的横向抗扰能力,干扰方向灵敏度仅为工作方向灵敏度的3.5%。
A fiber grating accelerometer based on flexible hinge was designed. The structure theory was analyzed, and the finite element model was constructed to simulate and analyze the acceleration sensing characteristics of the sensor. Based on the F-P filter, an optical fiber grating acceleration detection system with temperature self-compensation function was constructed. The F-P filter was feedback controlled by adding feedback control circuit, which realized zero-point temperature compensation of the system. The experimental results show that the system has a good dynamic response to acceleration continuous excitation signal and impact excitation signal. The natural frequency of the system is 380.0Hz, the dynamic response range is up to 65.6dB, the frequency response range is 10.0 ~ 240.0 Hz, the sensitivity is 236 pm / g. The designed acceleration sensor has a strong horizontal anti-jamming capability and the interference direction sensitivity is only 3.5% of the working direction sensitivity.