扭转抑制光纤陀螺法拉第效应的理论研究

摘要

Fiber optic gyroscope Faraday effect as non-reciprocity error source affects the performance of the fiber optic gyro,especially the precision of fiber optic gyro.This paper introduces the magnetic sensitive mechanism of fiber optic gyro and analyzes the main source of fiber optic gyro radial and axial magnetic sensitivity error.To improve the torsion of circular birefringence fiber rate,coupled wave equation of twisted fiber is an evaluation of twist fiber circular birefringence.Based on the above analysis,this paper puts forward a reverse torsion fiber method.Relatively high circular birefringence is introduced.Compensation of the original fiber ring non-reciprocal phase difference is realized so as to restrain the sensitivity error of fiber optic gyro magnetic.Simulation and analysis of the compensation characteristics of the optical fiber torsion compensation method are carried out.%光纤陀螺法拉第磁光效应作为非互易性误差源,是影响光纤陀螺性能,尤其是影响光纤陀螺精度的主要原因之一.介绍了光纤陀螺的磁敏感机理,分析了光纤陀螺径向和轴向磁敏感性误差的主要来源.提出了通过在光纤陀螺原有光纤环上熔接反向扭转光纤的方法,引入比较高的圆双折射,对原有光纤环的非互易相位差进行补偿,达到抑制光纤陀螺磁敏感性误差的目的,探讨了该方法的可行性,并对补偿特征进行了仿真分析.