非晶丝GMI效应频率谱和锁相环电路磁场传感器  

Frequency Spectra of GMI Effect for Amorphous Wires and GMI Magnetic Sensor with Voltage Controlled Oscillator Circuit

作　　者：周立[1] 贺红 章复中[1] 章雷 

机构地区：[1]北京联合大学,北京100101 [2]北京电子职业科技学院,北京100176 [3]北京麦科尼科技有限公司,北京100110

出　　处：《仪表技术与传感器》2009年第8期9-10,51,共3页Instrument Technique and Sensor

摘　　要：采用HP4191A型阻抗分析仪和专门为测量非晶丝GMI效应而设计的专用装置，研究了测量电流频率钴-铁-硅-硼（Co-Fe-Si-B）非晶丝GMI效应的影响。对于经冷拔、真空退火和张应力退火制成的非晶丝，当测量频率由1MHz、5MHz、10MHz、20MHz、30MHz、40MHz…，改变到400MHz时，GMI比值、[（Z-Z0）／Z0]、对外加磁场（Hex）的关系曲线都呈现正GMI效应的特征，其峰值和曲线的最大斜率先是不断增加，直到极大值，然后下降，极大值约为60-100MHz。据此，设计了测量电流频率可变的压控振荡器电路GMI磁场传感器，在75MHz下，传感器的磁场测量灵敏度达到0.4mV／nT。The frequency spectra of giant magneto-impedance effect for the cold-drawn and tension-stress annealed Co - Fe - Si - B amorphous wire with 70μm diameter were investigated in a measuring current frequency range of 1 to 400 MHz. All of the [（Z-Z0）/Z0]-Hex curves exhibit positive GMI effect characteristic. Both the maximum GMI ratio,[（Z-Z0）/Z0]max , and the maximum slop of curve, d [（Z-Z0）/Z0]/dHex reach the highest in the frequency range of 60 to 100 MHz. On the basis of the GMI spectra a new type of GMI magnetic field sensor with variable measuring current frequencies was developed by means of a voltage controlled oscillator. The magnetic field measuring sensitivity is about 0.4 mV/nT.

关 键 词：巨磁阻抗效应谱 钴-铁-硅-硼非晶丝 测量电流频率 GMI磁场传感器 压控振荡器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]