分布反馈式光纤激光加速度传感器结构设计

Structural Design of Distributed Feedback Fiber Laser Accelerometer Sensors

设计了一种竖直式封装结构的分布反馈式(DFB)光纤激光加速度传感器,建立了加速度灵敏度与质量块尺寸参数的理论模型。基于有限元软件,对该加速度传感器的频率响应性能进行了仿真分析,加工制作了传感器原型样品并进行了实验研究。实验结果表明,研制的DFB光纤激光加速度传感器在10~4000Hz频率范围内的平均加速度灵敏度为-119.1dB,且谐振峰值出现在5000Hz附近,与理论和仿真分析结果吻合较好。光纤激光加速度传感器的工作频带在高频方向得到了有效扩宽,能更好地满足DFB光纤激光加速度传感器在高频领域的工程化应用需求。

A distributed feedback（DFB）fiber laser accelerometer sensor with a vertically encapsulated structure is designed.The theoretical models of the acceleration sensitivity and the dimension parameters of the mass block are established.Based on the finite element software,the frequency response performance of this accelerometer sensor is simulated.The prototype sample of the sensor is fabricated and tested.The experimental results show that the average acceleration sensitivity of the fabricated DFB fiber laser accelerometer sensor reaches-119.1 dB in the spectral range of 10 to 4000 Hz,and the resonant peak appears near the frequency of 5000 Hz,which agrees well with the theoretical and simulated results.The working frequency band of the fiber laser accelerometer sensor is effectively broadened towards high frequency,which can better meet the requirements of engineering applications of DFB fiber laser accelerometer sensors in the high frequency field.