光学脉冲磁场传感测量中线双折射的补偿

线双折射是制约光学磁场传感器实用化的重要因素之一.为降低线双折射对光学磁场传感器稳定性和输出精度的影响,提出了光路补偿和电路补偿两种方案.光路补偿中使用一对光轴正交的磁光晶体材料作为传感元件,利用琼斯矩阵进行了理论推导,并进行了仿真验证.电路补偿适用于线双折射较大的情况,在交、直流分量中引入修正因子再进行信号处理,仿真计算得到修正因子的最佳值.结果表明,提出的两种方案均能提高输出线性度,改善系统输出误差.

Compensation methods for linear birefringence in optical magnetic field sensor

In o rder to reduce the influence of linear biref ringence o n o ptical mag netic field senso r, an o ptical compensa tion method and a circuit compensa tion method w ere proposed. A pai r of crystals w ith an a zimuth angle of 90 degree in optical axi s wa s used in optical compensatio n. The theo retical deductio n w as done wi th Jo nes mat rix . In ci rcui t compensatio n the amenda to ry factor was introduced in DC and AC component s and the optimal amendato ry facto r w as g ained by computatio n. The resul ts show that the proposed metho ds ca n sig ni fica nt ly decrease the erro rs and improve the stabi li ty o f the system.