光路偏振串扰误差对闭环光纤陀螺精度影响

Influence of polarization crosstalk error of optic path on the accuracy of a closed-loop fiber optic gyroscope

为解决闭环光纤陀螺光路中存在偏振串扰,导致光纤陀螺精度受到影响的问题,本文在变温环境下对光纤陀螺输出及零偏不稳定性进行了实验研究。从实际工程应用的角度,通过光学矩阵的方法对光路中的光学器件、熔接点以及光纤环中的偏振串扰点进行描述,并引入随温度变化的保偏光纤双折射变量,建立不同环境温度下光纤陀螺光路模型。结果表明:实验结果与理论估算基本一致,验证了模型的准确性。研究成果可以作为评价光纤陀螺光路是否存在缺陷的一种途径。

The precision of fiber coil measurement(FOG)is affected by the polarization crosstalk in the optical path of closed-loop FOG.Thus,an experimental study is performed on the output of fiber optic gyroscope and zero bias instability in a temperature-changing environment.From the perspective of practical engineering application,the optical components,fusion points,and polarization crosstalk points in the fiber coil are described by the optical matrix method,and the birefringence variable of polarization-preserving fiber-optical varying with temperature is introduced to establish the optical path model of FOG at different ambient temperatures.The experimental results are consistent with the theoretical estimation,which verifies the accuracy of the model.The research results can be used as a method to evaluate the optical path defects of FOG.