巨磁阻传感器原理-电测与仪表.docVIP

巨磁阻传感器动态特性测量方法的研究 （，北京 100） 摘要：与传统的磁阻传感器相比，巨磁阻传感器具有灵敏度高、可靠性好、测量范围宽、抗恶劣环境、体积小等优点。电力系统中电流信号是由工频与高次谐波构成，对其监测需选择频域范围宽的传感器，具有良好动态特性的巨磁阻传感器符合这一要求。但目前没有可以准确评估其在高次谐波情况下动态特性的方法。提出一种测试方法采用亥姆霍兹线圈产生标准高频磁场，用数据采集板卡收发信号，上位机编写程序实现传感器输出信号的自动采集与处理测试方法实现巨磁阻传感器动态特性测量，为巨磁阻传感器动态特性的分析提供了一种新思路。 关键词：巨磁阻传感器；动态特性；磁场发生；测试方法 中图分类号：T 文献标识码： 文章编号： Research of measurement method applied on the dynamic characteristics of giant magneto-resistance sensor Wang Jingyi, Qian Zheng, Wang Xianwei (School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China) Abstract: Compared with the traditional magneto-resistive sensors, the giant magneto-resistance sensor has the advantages of high sensitivity, good reliability, wide measuring range, poor environment adaptability, and small volume etc. The new measurement method of large alternating current in power system is always a hot problem. For the current signal in power system is composed of fundamental frequency and higher harmonics, it is necessary to use a kind of magnetic sensor which has a wide frequency range. And the giant magneto-resistance (GMR) sensor has the advantages of wide measuring range which meets the requirements. However, there is still a difficult problem to assess the dynamic characteristics of GMR with higher harmonics. This paper presents a new test method,that is to use Helmholtz coil as the magnetic field generating device, and the data acquisition card is used as the signal receiving and transmitting device. We program the computer to realize the automatic acquisition and processing of the sensor’s output signal. This paper firstly does the static characteristic test of the GMR sensor. On the basis of the results, the different frequency magnetic fields are tested using the above method. This paper realizes the measurement of the dynamic characteristics of the giant magneto-resistance sensor to a certain extent. It provides a new train of thought for the anal