Li Xuyou, Liu Pan, Guang Xingxing, Xu Zhenlong, Guan Lianwu, Li Guangchun
College of Automation, Harbin Engineering University, Harbin 150001, China.
Shandong Institute of Space Electronic Technology, Yantai 264000, China.
Sensors (Basel). 2017 Sep 7;17(9):2046. doi: 10.3390/s17092046.
Improving the performance of interferometric fiber optic gyroscope (IFOG) in harsh environments, such as magnetic field and temperature field variation, is necessary for its practical applications. This paper presents an investigation of Faraday effect-induced bias error of IFOG under varying temperature. Jones matrix method is utilized to formulize the temperature dependence of Faraday effect-induced bias error. Theoretical results show that the Faraday effect-induced bias error changes with the temperature in the non-skeleton polarization maintaining (PM) fiber coil. This phenomenon is caused by the temperature dependence of linear birefringence and Verdet constant of PM fiber. Particularly, Faraday effect-induced bias errors of two polarizations always have opposite signs that can be compensated optically regardless of the changes of the temperature. Two experiments with a 1000 m non-skeleton PM fiber coil are performed, and the experimental results support these theoretical predictions. This study is promising for improving the bias stability of IFOG.
提高干涉式光纤陀螺仪（IFOG）在诸如磁场和温度场变化等恶劣环境中的性能，对于其实际应用而言是必要的。本文针对不同温度下IFOG的法拉第效应引起的偏置误差展开了研究。采用琼斯矩阵法来阐述法拉第效应引起的偏置误差的温度依赖性。理论结果表明，在非骨架保偏（PM）光纤线圈中，法拉第效应引起的偏置误差随温度而变化。这种现象是由PM光纤的线性双折射和费尔德常数的温度依赖性所导致的。特别地，两个偏振态的法拉第效应引起的偏置误差总是具有相反的符号，无论温度如何变化，都可以通过光学方法进行补偿。使用一个1000米的非骨架PM光纤线圈进行了两个实验，实验结果支持了这些理论预测。该研究对于提高IFOG的偏置稳定性具有重要意义。
