巨磁阻抗_GMI_效应在电流传感器领域的研究.pdfVIP

总第47 卷 第535 期 电测与仪表 Vol.47 No.535 2010 年 第07 期 Electrical Measurement Instrumentation Jul. 2010 巨磁阻抗（GMI）效应在电流传感器领域的研究 宁 ，任欢，李玉莲 （沈阳计量测试院，沈阳110179） 摘要：回顾了巨磁阻抗（GMI）效应发展的历史，介绍了巨磁阻抗（GMI）效应起源、理论方法，设计制作了一种基 于巨磁阻抗（GMI）效应的电流传感器，并采用CoZrB 等材料的非晶带制作成螺旋式结构探头。该传感器由科比 茨振荡电路，前置放大器，整流电路和调零输出放大器构成；前置放大器输入端联接非晶带两端，前置放大器放 大的信号由输出端接整流电路，整流电路将高频交流信号转化为二倍交流信号峰值的直流信号，再接调零输 出，放大器输出接A/D 转换及数字显示部分。采取非接触式方式，达到测量电流目的。 关键词：GMI 效应；电流传感器；螺旋式电流传感器 中图分类号：TM933 文献标识码：A 文章编号：1001- 1390（2010）07- 0016- 05 Research of Giant Magnetoimpedance Effect Based in Current Sensor NING Liang ，REN Huan ，LI Yu-lian (Shenyang Institute of Metrology and Testing, Shenyang 110179, China ) Abstract: In this thesis, we mainly reviewed the history of GMI effect, introduced the origin of GMI, and the methods in researching GMI effect.We designed the current sensor based on GMI effect, the amorphous materials such as CoZrB are used to develop spiral structure probe. The sensor is consisting of colpitts oscillator, per - amplifier, rectifier and Amplifier with zero -adjust. The input of per -amplifier connects to both ends of the amorphous materials. The amplified signal of per-amplifier connects to the rectifying circuit from the output. The rectifying circuit converts the high frequency AC signal into DC signal which of double AC signal peak, and then zero output. The amplifier output connects to A/D conversion and digital display. The non-contact method is used in measuring Current value. Key words: GMI effect ,current sensor ,spiral current sensor 0 引 言