给出了基于偏振效应的光纤光栅磁场传感器的方法。为了降低传感器中线双折射对传感系统输出的影响, 提高测量系统的稳定性, 利用琼斯矩阵对线双折射及入射起偏角对系统输出特性的影响进行了理论推导及仿真, 研究了系统对线双折射变化的敏感度大小与起偏角的关系, 确定了最佳起偏角。以最佳起偏角入射, 可以将系统对线双折射变化的敏感度降到最低, 提高系统的稳定性和可靠性, 为光纤光栅磁场传感器的实用化设计提供了参考。

The methods of electromagnetic sensor with fiber grating based on the polarized effect were discussed. The effect of the linear birefringence and the incident polarizing angle on the output performance of the sensor were derived using Jones matrix and the simulations were made. The research on the relationship between the sensitivity of the sensor to the linear birefringence and the incident polarizing angle has been made. The results show that when incident polarizing angle has some special values the sensitivity of the system to the linear birefringence will be minimized and the stability of the system will be enhanced.