内凹正方角锥反射式光纤传感探头调制特性的数值模拟

摘要

针对以往滑觉传感器存在的不足，提出了一种新型的光纤滑觉传感机理.这种传感机理的最大优点是系统抗电磁干扰，能实现全自动补偿，灵敏度高.探头结构采用了全方位传感和全自动补偿技术，由5根同种光纤构成.在纤端出射光场光强分布公式的基础上，在小角度近似下，理论上推导出内凹正方角锥反射式光纤传感探头调制特性的简明公式，即输出信号与角镜转角成正比的结论.证明了这种传感机理的可行性，并为这种传感器的后续信号处理提供了理论基础.本文给出了非近似条件下的计算机仿真结果.作出了传感器输出随反射镜调制转角变化的模拟图.研究了影响这种传感探头调制特性的各种因素及初始结构优化参数，为光纤滑觉传感器的研制、开发提供理论指导.数值模拟与理论公式相一致的结果说明，内凹正方角锥反射式光纤传感探头用于光纤滑觉传感器是可行的.%A novel optical fiber sliding sensing mechanism made of five pieces of the same optical fiber which resists disturbance of electromagnetism, automatically realizes compensation, has high sensitivity, and causes the output signal to be proportional to the rotation angle of the angled-mirror, and the computer simulation results under non-approximate calculation and simulation curves of the output signal against modulation rotation angle as well, analyses the effects of all kinds of parameters on modulation characteristics and optimum value and concludes from experimental results that it is feasible to use the optical fiber sensing probe in the optical fiber sliding sensor.