保偏光纤干涉型陀螺的磁场误差分析与抑制方法  

Magnetic Error Analyzing and Suppressing on a Palorization-Maintaining Interferometric Fiber-Optic Gyroscope

作　　者：胡宗福[1] 姜润知 周剑[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201806

出　　处：《光学学报》2014年第6期53-57,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60972002)

摘　　要：基于保偏光纤的琼斯矩阵,建立了保偏光纤线圈的Faraday非互易相移模型,利用该模型进行计算发现:线圈保偏光纤的慢轴与快轴的Faraday非互易相移大小近似相等,但符号相反。并进一步提出了偏振环行干涉型保偏光纤陀螺(PCPM-IFOG),它能使顺时针(CW)和逆时针(CCW)光在保偏光纤线圈中沿慢和快轴分别传输一次,因此顺时针和逆时针光总的Faraday非互易相移等于0,实现了Faraday非互易相移的完全抑制。500m保偏光纤线圈的偏振环行干涉型保偏光纤陀螺的实验结果显示其输出与地球磁场无关,而对于相同传感线圈的干涉型保偏光纤陀螺,当磁场方角发生变化时,陀螺有约±0.3°/h的Faraday零偏漂移。Based on the Jones matrix of polarization-maintaining fiber, a model of Faraday nonreciprocal phase shift of a polarization-maintaining fiber coil is established. Calculation results show that the Faraday nonreciprocal phase shifts of the fiber coil have opposite polarity in the fiber＇s slow and fast axises, but are equal in size. A polarization alternately circulation polarization-maintaining interferometric fiber-optic gyroscope （PCPM-IFOG） is introduced that allows for the clockwise （CW） and counter clockwise （CCW） lights circle propagating around the coil once in the fiber＇s slow and fast axises separately. So the total Faraday nonreciprocal phase shift is zero and complete suppression on the effects of the Faraday nonreciprocal phase shift is achieved. Experiment results show the output of PCPM- IFOG with 500 m polarization-maintaining fiber coil, has no relation with the earth magnetic field. In contrast, the output Faraday bias drift of a polarization-maintaining interferometric fiber-optic gyroscope （PM-IFOG） with the same polarization-maintaining fiber coil is about ±0.3°/h when PM-IFOG azimuth angle is changed.

关 键 词：光学器件 光纤陀螺 保偏光纤 Faraday非互易相移 偏置漂移 偏振环行 

分 类 号：V241.5[航空宇航科学与技术—飞行器设计]