中文摘要：

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／s^2，横向灵敏度系数小于10％，并具备较好的抗干扰能力。

英文摘要：

In order to adapt to the application of optical fiber sensor in high speed mechanical equipment safety monitoring, a kind of double-fiber-Bragg-grating （FBG） symmetrical high-frequency acceleration sensor is designed and a novel FBG matched demodulation method is proposed. The structure and work- ing principle of sensor are demonstrated, and the theoretical calculation and finite element method are used to analyze static and dynamic characteristics of the sensor. Finally the sensitivity,the amplitude-fre- quency response characteristics and transverse anti-jamming ability of the accelerometer are tested exper- imentally. The matched FBG demodulation principle based on the ratio method is analyzed,which can e- liminate the impact of the LED instability on the measurement accuracy. The experimental results show that：the sensor resonant frequency is 900 Hz,the sensitivity is 88 mV/g and the measurement value of acceleration is up to 80 m/s2 ,which is basically consistent with the theoretical calculation and finite element analysis results; the transverse sensitivity coefficient is less than 10%, and the sensor has a good anti-interference ability.