铁磁晶体磁滞对交变磁场传感器测量精度的影响

Effects of the In BiCaVIG Crystal's Hysteresis on the Measurement Accuracy of the Alternating Magnetic Field Optical Fiber Sensor

详细地分析了铁磁性晶体Ｉｎ－ＢｉＣａＶＩＧ的磁滞对交变磁场光纤传感器测量精度的影响，提出采用偏振光交直流信号和非偏振光多参量同时测量的方法可监测系统静态工作点，有效地减小磁滞的作用，使传感器在晶体剩余磁旋光角为５°时实现精度高达１％的高灵敏度交变磁场测量。

The effects of the ferromagnetic crystal In BiCaVIG's hysteresis on the measurement accuracy of alternating magnetic field optical fiber sensor is described in detail. The method of multi parameter simultaneous measurement including the direct and alternating signals of polarized light and unpolarized light is proposed to monitor the sensor's static operating point and reduce the actions of the hysteresis effectively. Therefore, the accuracy of the high sensitivity sensor in measuring alternating magnetic field achieves 1% when the crystal's residual magnetic rotation angle is about 5°.