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保偏光纤环是光纤陀螺的核心部件,其性能受温度的影响较大,主要表现为热致互易相移,影响光纤陀螺的精度。针对该问题,提出采用应力分布法测量光纤环的温度非互易相移。通过对不同温度点的光纤环应力分布数据进行分析,建立光程对中数学模型,基于该模型对光纤环的尾纤进行适当调整,改进其光学对称性,降低由温度变化引起的非互易相移。通过陀螺整机实验表明:该方法能大幅提高光纤陀螺的精度,过程简单方便,对成品光纤环具有一定的修复作用,提高了成品率,实用性较好。
Polarization maintaining fiber loop is the core component of fiber optic gyroscope. Its performance is greatly affected by temperature, which is mainly caused by thermal induced reciprocal phase shift, which affects the accuracy of fiber optic gyroscope. In response to this problem, the temperature non-reciprocal phase shift of the fiber ring is proposed using the stress distribution method. Based on the analysis of stress distribution data of optical fiber ring at different temperature points, a mathematic model of optical path alignment is established. Based on this model, tail fiber of optical fiber ring is properly adjusted to improve its optical symmetry and to reduce the nonreciprocity caused by temperature change Phase shift. Through the gyro machine experiment shows that: This method can greatly improve the accuracy of fiber optic gyro, the process is simple and convenient, the finished fiber ring has a certain role in repairing, improve the yield, good practicability.