基于柔性铰链结构的高灵敏度低频光纤光栅加速度传感器

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380.0 Hz，动态响应范围可达65.6 dB，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%。

High sensitivity and low-frequency FBG acceleration sensors based on flexure hinge structure

A fiber grating acceleration sensor based on flexure hinge structure was designed. The structure theory analysis was carried out and the finite element model was built to simulate and analyze the acceleration sensing characteristic of the sensor. A fiber Bragg grating(FBG) acceleration detection system with temperature self-compensation was designed based on F-P filter, which achieved zero temperature self-compensation by adding a feedback circuit to control F-P filter. The characteristics of the system were tested on the built system. The results indicate that the system has excellent response to impulse excitation signal and continuous acceleration excitation signal. Natural frequency of the system is 380.0 Hz, while the dynamic range reaching 65.6 dB. The frequency response range of the system is 10.0 -240.0 Hz, in which the acceleration sensitivity is 236 pm/g. Since the sensitivity in the interference direction is only 3.5% of the sensitivity in the working direction，the acceleration sensor is designed with strong lateral immunity.