对称法减小去偏陀螺轴向磁场灵敏度

Decreasing Axial Magnetic Field Sensitivity with Symmetrical Fiber Loop in Fiber-Optic Depolarized Gyro

基于单色光,利用琼斯矩阵,导出了去偏光纤陀螺对垂直于光纤环面的轴向磁场敏感的具体公式.分别对单个光纤环和两个对称的光纤环进行理论分析、给出仿真结果,并首次提出减小轴向磁场灵敏度的新方法:采用两个对称的光纤环减小轴向磁场灵敏度.与单个光纤环相比,不对称度为1%的两个对称光纤环,轴向磁场灵敏度可以下降到3‰以下.

Based on monochromatic light, the specific formula that the fiber-optic depolarized gyro is sensitivity to the axial magnetic , which is perpendicular to the endface of the fiber loop, is deducted by use of Jones matrix. Theory derivation about single fiber loop and two symmetrical fiber loops is introduced, respectively. The emulation result is given. And the new technique is put forward too, that it is the two- symmetrical fibers loops to decrease axial magnetic sensitivity. Compared to the single fiber loop, the twosymmetrical fibers loops whose degree of dissymmetry is 1% can decrease the axial magnetic sensigivity to not less than 3‰.