基于有限元方法的光纤加速度计灵敏度仿真分析

Research on the Acceleration Sensibility of Fiber-optical Accelerometer Using Finite Element Method

阐述了光纤加速度计的工作原理,利用有限元方法得到光纤加速度计两弹性柱体外半径上节点的径向形变ΔR,并通过公式计算得出加速度灵敏度值39.69dB(0dB=1rad/g),最后依据仿真得到的结构材料参数,研制了光纤加速度计,并测得其加速度灵敏度为39.43dB,与仿真结果相差0.26dB,实验数据与仿真结果相吻合。研究结果表明,利用有限元方法对光纤加速度计加速度灵敏度性能进行仿真具有一定可行性,该研究对芯轴式推挽型光纤加速度计的结构设计和广泛应用具有重要的理论指导意义。

The theory of optical fiber accelerometer was represented,and the radial strainΔRof node in external radius of fiber-optical accelerometer was obtained by the finite element method and the acceleration sensitivity of 39.69dB（0dB=1rad/g）was simulated by the theoretical formula. According to the structure and material parameters obtained from simulations,it is constructed a fiber-optical vector hydrophone,and the experimental results show that the acceleration sensitivity is 39.43 dB which is only 0.26 dB lower than the simulation result.It is indicated that using the finite element method to analyze the acceleration sensitivity of fiber optic accelerometer is practicable and can provide an important theoretical guiding significance on the structure design and wide application of push-pull type fiber-optic accelerometer.