灵敏度是衡量传感器的重要指标之一, 基于双折射光纤环镜(PM-FLM)应变传感器灵敏度理论模型, 通过数值模拟与实验的方法, 在不增加系统复杂性的前提下, 通过自身性能优化PM-FLM轴向应变灵敏度; 同时研究了双折射光纤(PMF)长度对PM-FLM轴向应变灵敏度的影响。 研究结果表明: 对于相同PM-FLM, 可以选择长波长监测点优化轴向应变灵敏度; 对于双折射率相同的PM-FLM, 可以选择双折射应变系数较大的PMF优化轴向应变灵敏度。 对于双折射应变系数相同的PM-FLM, 可以选择双折射率较小的PMF优化轴向应变灵敏度。 PM-FLM传感器应变灵敏度与PMF长度无关。

Sensitivity is one of the important performances for sensor. Without increasing system complexity, this paper studied the influence of self-performance and polarization maintaining fiber(PMF) length on the axial strain sensitivity of polarization maintaining loop mirror(PM-FLM)based on the theoretical model of PM-FLM by numerical simulation and experiments. The results show that we can choose a long wavelength point as a monitoring point to optimize the axial strain sensitivity for the same PM-FLM, a high strain dependent birefringence coefficient PMF to optimize the axial strain sensitivity for the PM-FLM with the same birefringence, a low birefringence PMF to optimize the axial strain sensitivity for the PM-FLM with the same strain dependent birefringence coefficient and the axial strain sensitivity is unrelated to PMF length.