文档介绍：
扫频测量在 GMI 效应测试中的应用#
张鑫,晋芳,周玲**
(中国地质大学(武汉)机械与电子信息学院,武汉 430074)
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摘要:对磁性材料巨磁阻抗(GMI)效应的研究需要测试其在不同频率下的 GMI 曲线,而
用传统 GMI 测试方法构建的系统在单次测试中只能得到单个频率下的 GMI 曲线,因此需要
多次测试才能得到材料在不同频率下的 GMI 曲线,测试效率十分低下。本文将扫频测量方
法引入于 GMI 效应的测试中,分析了 GMI 效应扫频测量的原理,并应用于 LabVIEW 软件
编写的 GMI 测试系统程序。通过对 Vitrovac6025 带材的 GMI 效应进行对比测试实验,发现
该扫频测量方法测得的 GMI 效应曲线与其他文章测试结果一致,并且该方法可以在单次测
试中实现被测材料的多个频率下 GMI 效应的同时测量,从而大大减少了 GMI 测试所耗费的
时间,提高了测试效率。
关键词:巨磁阻抗效应;扫频;测试
中图分类号:TP29
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The Application of Sweep Frequency in GMI Test
Zhang Xin, Jin Fang, Zhou Ling
(Faculty of Mechanical & Electronic Information, China University of Geosciences,
WuHan 430074)
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25
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Abstract: It is necessary to measure the GMI (Giant o-impedance) curve of ic
material under a series of frequency in the research of GMI effect. Conventional measurement
method of GMI effect can only get one GMI curve under a frequency in a single test. So many
tests are needed to get GMI curves under different frequency. The test efficiency is very low. In
this article, the sweep frequency measurement method is introduced and applied to the test system
which is programmed in LabVIEW. By testing the Vitrovac6025 amorphous ribbons, the GMI
effect curves which are measured by the sweep measurement method are consistent with other
article’s result. The results show that the designed test system can implement the measurement of
GM