针对磁致伸缩材料在弱磁场传感器领域的应用需要，采用迈克耳逊干涉原理实验测量了零应力条件下Tb-Dy-Fe材料和Fe-Ga合金的磁场响应灵敏度，以及不同应力下Fe-Ga合金的磁场响应特性和温度响应特性.实验结果表明：在零应力，外加磁场16 mT条件下，Fe-Ga合金的磁场响应灵敏度远高于Tb-Dy-Fe材料，更合适作为弱磁场传感器敏感材料；同时，在1.2 MPa预应力和26 mT偏置磁场下，Fe-Ga合金材料具有较好的磁场响应灵敏度和较大的饱和磁致伸缩系数，因而处在最佳工作状态.所得到的材料的磁场和温度响应曲线可作为弱磁场传感器参量设计的参考依据.

Based on the application requirements of magnetostrictive materials in weak magnetic field sensor,the magnetic field response sensitivities of Tb-Dy-Fe material and Fe-Ga alloy were measured by using Michelson interferometory.The magnetic field and temperature responses of Fe-Ga alloy under different external stresses were also experimentally analyzed in detail.The experimental results show that when the magnetic induction is about 16 mT in the condition of no external stress,the magnetic field response sensitivity of Fe-Ga alloy is much higher than that of Tb-Dy-Fe material.For the magnetic sensors requiring high sensitivity and small measurement range,Fe-Ga alloy are more suitable as the sensitive material of the sensors.Especially,under 1.2 MPa external stress and 26 mT offset magnetic field,Fe-Ga alloy will exhibit preferable magnetic field response sensitivity and larger saturation magnetostriction coefficient,which can be considered in the optimal working state.Therefore,the measured magnetic field and temperature responses curves of those materials could be used as the parameter design references of weak magnetic field sensors.