中国激光, 2015, 42 (8): 0805005, 网络出版: 2022-09-24
光纤陀螺光纤环轴向磁敏感性研究
Study on the Axial Magnetic Field Sensitivity in Optical Fiber Coil of Fiber Optic Gyroscope
光纤光学 轴向磁敏感性 光纤陀螺 法拉第效应 扭转 保偏光纤环 fiber optics axial magnetic field sensitivity fiber optic gyroscope Faraday effect twist polarization maintaining fiber coil
摘要
磁敏感性是光纤陀螺(FOG)的主要误差源之一,而光纤环是主要的敏感源。在外界磁场作用下,光纤陀螺中会产生一个非互易相位差,影响陀螺的精度。相关实验表明保偏(PM)光纤环中轴向磁敏感性比径向磁敏感性更显著。主要从三个方面研究了轴向磁场对光纤陀螺的影响机理,包括轴向磁场平行分量引起的光纤随机扭转法拉第磁场漂移、光纤几何扭转引起的法拉第非互易相位差以及轴向磁场垂直分量引起的非法拉第非互易相位差。对理论结果进行了仿真分析和实验验证,结果表明:由垂直分量磁场引起的非互易相位差是光纤陀螺轴向磁敏感性的主要原因,其大小与光纤环骨架半径密切相关;骨架半径越小的光纤环,轴向磁敏感性越强。
Abstract
The magnetic field sensitivity is the main source of errors in fiber optic gyroscope (FOG) and the optical fiber coil is a major sensitive source. In an external magnetic field, a nonreciprocal phase error will be generated in a FOG and decrease the gyro precision. Related experimental results show that the axial magnetic field sensitivity in the polarization maintaining (PM) fiber coils is more obvious than the radial magnetic field sensitivity. The axial magnetic field sensitivity is studied, including Faraday shift caused by fiber random twist, Faraday nonreciprocal phase caused by geometry twist and non-Faraday nonreciprocal phase caused by vertical component magnetic field. Theoretical results are simulated and verified by the experiments. Results show that nonreciprocal phase caused by vertical component magnetic field is the main reason for axial magnetic field sensitivity and closely related to the fiber coil′s skeleton radius. Furthermore, the smaller the skeleton radius is, the greater the axial magnetic field sensitivity will be.
王夏霄, 冯志芳, 秦祎, 于佳, 吕江涛. 光纤陀螺光纤环轴向磁敏感性研究[J]. 中国激光, 2015, 42(8): 0805005. Wang Xiaxiao, Feng Zhifang, Qin Yi, Yu Jia, Lü Jiangtao. Study on the Axial Magnetic Field Sensitivity in Optical Fiber Coil of Fiber Optic Gyroscope[J]. Chinese Journal of Lasers, 2015, 42(8): 0805005.