基于纵向激励的铁基非晶带弱磁传感器研究

Fe-based Amorphous Ribbon Weak Magnetic Sensor Based on Longitudinal Excitation

为研制高性能的弱磁传感器,通过纵向激励方式,使得铁基非晶带Fe78Si9B13具有高巨磁阻抗(GM I)效应。在传感器电路设计中,RC反相振荡电路与开关管构成脉冲信号发生电路;峰值检波电路、无源低通滤波电路与AD620差分运算电路构成信号调理电路;由双运放组成的V/I转换电路作为负反馈电路。对基于GM I效应的弱磁传感器的输出进行了试验标定与数据分析。测试结果表明:在磁场-210μT至210μT范围内,灵敏度为5.7 mV/μT、线性度为0.87%,重复性为0.63%,迟滞误差为±0.36%,达到了实际的弱磁场测试要求。

To research the weak magnetic sensor with high performance,the Fe-based amorphous ribbon Fe78Si9B13 is made to have high giant magneto impedance（GMI）effect by longitudinal excitation.In the circuit design of the sensor,the pulse excitation current circuit is made up of the RC-invertors oscillating circuit and a switch transistor;the signal conditioning circuit is composed of a peak-value detector,a passive low-pass filter circuit and a differential amplifier AD620;the feedback circuit is composed of a V/I converting circuit based on a dual operational amplifiers.The output of the weak magnetic sensor based on the GMI effect is experimentally calibrated and analyzed on data.The test results show：in the magnetic field from-210μT to 210μT,the sensitivity is 5.7 mV/μT,the linearity is 0.87%,the repeatability is 0.63% and the hysteresis is ±0.36%,which attains the test requirement of a weak magnetic field.