Fe基纳米晶合金闭环弱电流传感器的研究

Study on the Closed Loop Weak Current Sensor Using Fe-based Nanocrystalline Alloy

研究了利用具有高磁性温度稳定性的纳米晶合金Fe73 5Cu1Nb3 Si13 5B9敏感材料制成的新型弱电流传感器。它采用对称的单纳米晶磁芯双绕组结构 ,多谐振荡桥励磁及反馈技术 ,极大地改善了传感器的性能。详细地介绍了该传感器的工作原理 ,设计了信号处理电路。传感器工作量程为 -2 0 0～ 2 0 0mA ,线性度优于 0 2 %FS ,零点温度漂移优于 0 0 2 5 %FS/℃ (12℃～ 80℃ ) ,截止频率可达 2kHz。

A new weak current sensor using nanocrystalline Fe 73 5 Cu 1 Nb 3Si 13 5 B 9 alloy is investigated By using the negative feedback technique and the symmetric structure of single nanocrystalline magnetic core excited by a multivibrator with double coils,the properties of the sensor are improved greatly The principle of the sensor is analyzed in detail,and the signal processing circuit is designed Current of -200～200mA is stably detected with a nonlinearity error less than 0 2%FS A high temperature stability in the current sensor is realized,in which a zero drift for temperature variation from 12℃ to 80℃ is less than 0 025%FS/℃ The cut off frequency of the sensor amounts to 2kHz