偏振串扰对光纤陀螺零漂及随机游走影响的研究

Research on Influence of Polarization Crosstalk on the Zero Drift and Random Walk of Fiber Optic Gyroscope

针对保偏光纤陀螺静态参数受光路偏振串扰误差的影响而使陀螺精度受到制约的问题,从实际应用的角度,研究了保偏光纤陀螺光路中由于各光学器件不理想和熔接点对轴角度误差等因素引起偏振串扰误差的机制。基于琼斯矩阵和相干矩阵,并引入随温度变化的保偏光纤双折射变量,建立了变温环境下保偏光纤陀螺的光路传输模型,对变温环境下偏振串扰误差对保偏光纤陀螺零漂和随机游走的影响进行了理论分析和估算。同时开展了变温环境下光纤环偏振串扰对其静态参数影响的相关实验。实验结果与模型分析结果基本一致,表明该模型是合理的。

To solve the problem of the restricted accuracy of the polarization maintaining fiber optic gyroscope （PM- FOG）, whose static parameters are influenced by its optical path polarization crosstalk errors, from the view of practical applications, the mechanism of polarization crosstalk errors in light path caused by unsatisfactory optical devices and fused points＇ axis angle errors is studied. Based on the Jones matrix and correlation matrix, the PM fiber＇ s birefringence variable which varies with temperature change is introduced, the optical transmission model of PM- FOG in variable temperature fields is built, and the effect of polarization crosstalk errors on PM-FOG zero drift and random walk in variable temperature fields is analyzed and estimated. Meanwhile, the related experiments are carried out to study the effect of fiber coils polarization crosstalk on its static parameters in variable temperature fields. The experimental results and analysis results of model are in agreement, which shows that the model is reasonable.