应用传输矩阵法,对相移光栅的磁场传感机理进行了理论推导和仿真验证,分析了相移光栅的相移大小、相移位置以及光栅长度对磁场传感系统性能的影响。仿真结果表明,相移光栅阻带中透射窗口的带宽和透射率直接影响了磁场的测量结果,并与传统光纤布拉格光栅(FBG)测量方案进行了比较。仿真和实验表明,具有窄带宽高透射率透射窗口的相移光栅能够显著提高磁场传感系统的精度和灵敏度。

The magnetic field measurement mechanism with phase-shifted grating is presented by using transfer matrix approach. The effects of grating parameters on the sensing performance are analyzed by simulations. It shows that the bandwidth and transmission rate of the stop-band transmission window in phase-shifted grating have great effects on the measurements. The results are compared with fiber Bragg grating (FBG) scheme. The simulations and experiments show that the phase-shifted grating with narrow bandwidth and high transmission rate can improve the accuracy and sensitivity of the magnetic sensor system.