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 transfer matrix method is used to theoretically deduce and verify the magnetic field sensing mechanism of the phase-shifted grating. The influence of the phase shift size, the phase shift position and the grating length on the performance of the magnetic field sensing system is analyzed. The simulation results show that the bandwidth and transmittance of the transmissive window in the stopband of the phase-shift grating directly affect the measurement results of the magnetic field, and are compared with the traditional FBG measurement scheme. Simulations and experiments show that the phase shift grating with a narrow bandwidth and high transmissivity transmission window can significantly improve the accuracy and sensitivity of the magnetic field sensing system.