电测与仪表2011，Vol.48Issue(9)：18-21,4.
基于磁敏电阻和复合调制的弱磁测量方法
Weak Magnetic Field Measurement Based on Magnetic Resistor and Complex Modulation
彭建学 1叶银忠 2张国良 3刘以建4
作者信息
- 1. 上海奥波电子有限公司,上海200070
- 2. 上海应用技术学院,上海200235
- 3. 复旦大学信息科学与工程学院上海200433
- 4. 上海海事大学物流工程学院,上海200135
- 折叠
摘要
Abstract
Because of the large temperature coefficient and insensitiveness to the direction of the magnetic field, the magnetic resistor is unsuitable to directly measuring weak magnetic field. A novel method of weak magnetic field measurement is proposed in which the magnetic resistor and the DC/AC complex modulation are incorporated. Designed are two hollow coils, one is connected with the magnetic resistor in series to generate modulated magnetic field and the other generates the reference magnetic field. With the DC modulation, the polarity of the modulated magnetic field is changed alternatively in the cases that the reference magnetic field is applied or removed, then the DC voltages of the magnetic resistor are detected and processed, finally the amplitude and the direction of the magnetic field are obtained. With the AC modulation, the DC voltages of the magnetic resistor are detected and processed alternatively in the cases that the reference magnetic field is applied or removed, then the amplitude and the direction of the magnetic field are obtained. The effectiveness of the proposed method is verified by the experiments which prove both the ability of detecting the direction of magnetic field and the independence of the measurement results on the temperature.关键词
弱磁测量/磁敏电阻/调制/温度漂移Key words
weak magnetic field measurement/ magnetic resistor/ modulation/ temperature drift分类
信息技术与安全科学引用本文复制引用
彭建学,叶银忠,张国良,刘以建..基于磁敏电阻和复合调制的弱磁测量方法[J].电测与仪表,2011,48(9):18-21,4.
