在分析光纤光栅传感原理的基础上, 设计了一种基于超磁致伸缩材料的光纤光栅磁场传感器。先将一根光纤光栅粘贴在超磁致伸缩材料上; 为补偿温度对磁场测量光纤光栅传感器的影响, 再将另一根光纤光栅的一端固定在有机玻璃上并保持自由状态。对设计的传感器进行温度和磁场强度响应特性实验, 在0~40 ℃的范围内, 磁场测量和温度补偿光纤光栅的温度灵敏度分别为22和9.9 pm/℃。在0~1 200×10-4 T范围内, 传感器的磁场强度检测灵敏度约为1 pm/1×10-4 T, 分辨率为1×10-4 T, 线性度为0.996 3, 稳定性约为±3×10-4 T, 为弱磁场的测量提供了一种新方法。

On the basis of analyzing the principle of Fiber Bragg Grating (FBG) sensors, a novel FBG magnetic field sensor based on giant magnetostrictive material is designed. A FBG is first stuck to the giant magnetostrictive material and in order to compensate the effects of temperature on the FBG sensor, one end of another FBG is fixed to a plexiglass and kept in a free state. Then the experimental study on the response characteristics of temperature and magnetic field intensity of the designed sensor is performed. In the range of 0~40 ℃, the temperature sensitivities of the magnetic field measurement and the FGB temperature compensation are 22 and 9.9 pm/℃ respectively. When the magnetic field intensity is 0~1 200 ×10-4 T, the magnetic field detection sensitivity of the sensor is about 1 pm/1×10-4 T, the resolution is 1×10-4 T, the linearity is 0.996 3 and the stability is about ±3×10-4 T. This study results provide a new method for the measurement of weak magnetic fields.