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光路系统的偏振误差极大地制约着双光程光纤陀螺精度的提高。为了提高新型双光程光纤陀螺的精度,利用相干矩阵和琼斯矩阵对光路中光学器件和熔接点的光学参数进行描述,通过分析顺时针光波与逆时针光波中耦合次波列与主波列间的相干叠加机理,建立了相应的偏振误差模型。利用Matlab以接近于工程实际的参数设置,对光路系统中熔接点、各光学器件缺陷对偏振误差的影响进行了仿真分析,并在此基础上提出了一种可有效抑制双光程光纤陀螺偏振误差的尾纤匹配法。仿真结果表明,通过适当的尾纤长度匹配,双光程光纤陀螺的偏振误差由0.145°/h减小为0.017°/h,其随温度变化的峰谷值也由0.25°/h减小至3×10-4°/h,双光程光纤陀螺的偏振误差得到有效抑制。
Polarization error of the light path system greatly limits the improvement of the accuracy of the double optical path fiber optic gyro. In order to improve the accuracy of the new two-path optical fiber gyroscope, the optical parameters of the optical components and splice points in the optical path are described by using the coherence matrix and the Jones matrix. By analyzing the relationship between the coupling sub-wave train and the counter-clockwise light wave The coherent superposition mechanism is established and the corresponding polarization error model is established. Using Matlab to approach the practical parameter settings, the influence of the splice points and optical defects in the optical system on the polarization error is simulated and analyzed. Based on this, a new method is proposed to suppress the polarization of the dual optical fiber gyroscope Error pigtail matching method. The simulation results show that the polarization error of the dual optical fiber optic gyroscope decreases from 0.145 ° / h to 0.017 ° / h with suitable pigtail length matching, and the peak-to-peak variation with temperature decreases from 0.25 ° / h to 3 × 10-4 ° / h, the polarization error of the double optical path fiber optic gyroscope is effectively suppressed.