磁光法拉第效应是光纤陀螺中存在的非互易效应, 会在陀螺输出零位附加一个固定偏置, 从而影响光纤陀螺的精度。针对陀螺内部电路的辐射磁场为球面非均匀磁场的特点, 建立了球面非均匀磁场的光纤陀螺磁敏感误差模型。采用数值模拟的方法分析了球面非均匀磁场对光纤陀螺磁敏感性的影响并进行了实验验证。实验证明, 球面磁场源距离光纤环越近, 光纤陀螺磁敏感误差越大;球面磁场源位于光纤环中心轴附近时, 光纤陀螺磁敏感误差较小;球面磁场源在光纤环内部中心轴向移动时, 光纤陀螺磁敏感误差基本不变。

Magneto-optic Faraday effect is the reciprocal effect that exists in fiber optic gyroscope (FOG). It adds an additional fixed bias which affects the precision in the output of FOG. Based on the characteristic that the radiation magnetic field of internal circuit of FOG is spherical inhomogeneous magnetic field, a magnetic sensibility error model of FOG in the spherical inhomogeneous magnetic field is established. Magnetic sensibility of FOG in the spherical inhomogeneous magnetic field is analyzed by the numerical simulation and verified by the experiment. Shorter the distance between the spherical magnetic field source and optical fiber ring is, larger FOG magnetic sensibility error is. When the spherical magnetic field source is located in the center of optical fiber ring, FOG magnetic sensibility error is the smallest. When the spherical magnetic field source moves around the axial of the optical fiber ring, FOG magnetic sensibility error almost remain unchanged.