线双折射对光纤光栅磁场传感器性能影响的理论分析

本文介绍了基于偏振效应的光纤光栅磁场传感器的工作机理。利用光纤光栅的偏振效应测量磁场可以克服以前传统测量磁场使用磁致伸缩材料不适合测量瞬态磁场的缺点，而且在传感头的设计上能够更加灵活。在传感头设计中，由于光纤本身存在的线双折射会对测量结果带来影响，为了明确双折射对光纤光栅磁场性能的影响，提高测量系统的准确爱，文中利用琼斯矩阵对光纤固有线双折射对传感器的测量特性的影响进行了理论推导和仿真分析，分别对稳态磁场和瞬态磁场受双折射的影响进行了仿真分析，为基于偏振效应的光纤光栅磁场传感器下一步实验研究提供了理论参考。

Theoretical Analysis of the Linear Birefringence's Influences on the Performances of the Fiber Grating Sensors for Electromagnetic Measurement

The working principle of fiber grating sensors for magnetic field measurement based on polarization effect is present in this paper. The shortage of traditional method using magnetostriction material which is no suiting transient electromagnetic measurement is overcome by using polarization effect of fiber grating and flexibility can be supplied in the design of sensor. In design, the inherent linear birefringence of fiber will affect the measuring result. So Jones Matrix is used in order to acquaint the effect of the linear birefringence on the performances of the fiber grating sensors and increase measuring accuracy. The effect of the linear birefringence on the steady and dynamic magnetic field were analyzed and emulated .The theoretical references are given for the farther research and development.