为了适应光纤传感器在高转速机械设备安全监测中的应用,设计了一种双光纤布拉格光栅(FBG)对称式的高频光纤光栅加速度传感器,并提出一种新的匹配FBG解调方法。阐述了传感器的结构和工作原理,利用有限元方法分析了传感器的静态与动态特性,并通过实验对传感器的灵敏度、幅频响应特性和横向抗干扰能力等方面进行了测试。提出了基于比值法的匹配光纤光栅解调原理,消除了光源不稳定等因素对检测精度的影响。实验结果表明,本文传感器谐振频率为900Hz,灵敏度为88mV/g,加速度测量范围大于80m/s2,横向灵敏度系数小于10%,并具备较好的抗干扰能力。 In order to adapt the application of optical fiber sensor in the safety monitoring of high speed mechanical equipment, a double fiber Bragg grating (FBG) symmetrical high frequency fiber grating acceleration sensor is designed and a new matched FBG demodulation method is proposed. The structure and working principle of the sensor are expounded. The static and dynamic characteristics of the sensor are analyzed by using the finite element method. The sensitivity, amplitude-frequency response characteristics and lateral anti-interference ability of the sensor are tested through experiments. The demodulation principle of matched FBG based on the ratio method is proposed, which eliminates the influence of the instability of the light source on the detection accuracy. The experimental results show that the sensor resonant frequency of 900Hz, the sensitivity of 88mV / g, acceleration measurement range greater than 80m / s2, lateral sensitivity coefficient of less than 10%, and have good anti-interference ability.