去偏光纤陀螺轴向磁漂移补偿技术研究

摘要

In an axial magnetic field (AMF) which is vertical to the plane of the fiber coil,a depolarized fiber optic gyro (D-FOG) takes on an axial magnetic drift.This drift is linearly related to the intensity of AMF BA,the length of the fiber L,the radius of the fiber coil r and the light wavelength λ.When a D-FOG is manufactured completely,this drift only displays a linear correlation with the AMF.A real time compensation model is established to eliminate the drift and the experimental results show that the axial magnetic sensitivity of the D-FOG decreased from 0.49 (°)/h/G to 0.008 (°)/h/G in 12 G AMF with two orders of magnitude decrease.%在垂直于光纤环面的轴向磁场作用下,去偏光纤陀螺产生的磁漂移与轴向磁场大小BA、光纤长度L、光纤环半径r、光源平均波长λ线性相关.而对于一制作完毕的去偏光纤陀螺,光纤长度L、光纤环半径r、光源平均波长λ相对固定,此时轴向磁漂移只与轴向磁场大小成线性关系.通过实时测量轴向磁场大小,根据轴向磁漂移补偿模型,实时软件补偿光纤陀螺的轴向磁场灵敏度.实验结果表明,通过软件补偿方法,在12 G轴向磁场下,可将去偏光纤陀螺的轴向磁场灵敏度从0.49(°)/h/G抑制到0.008(°)/h/G,磁漂移降低了2个数量级.