摘要
分析了基于非晶材料磁场测量传感器的噪声特性。根据非晶丝巨磁阻抗效应原理,设计了传感器的闭环负反馈结构,并分析了传感器的主要噪声源。在此基础上,分别考虑了驱动电流的低频噪声、幅值噪声、相位噪声以及影响非晶丝阻抗的外部磁场波动、内部磁场波动,根据泰勒展开并忽略高阶小项,得到非晶丝两端电压噪声表达式。然后,根据传感器的电路结构和传递函数,得到传感器输出电压噪声表达式,最终推导出了非晶材料磁传感器噪声模型。分析传感器噪声模型可知,提高传感器的反馈系数,可有效地降低该传感器的输出噪声谱密度。最后通过实验验证了上述结果的正确性。
Noise characteristics of the magnetic sensor based on amorphous materials is analyzed. Based magneto-impedance effect of amorphous wire, the sensor structure with closed loop negative feedback is d on giant esigned, and the main noise source is analyzed. Both the low frequency noise, amplitude noise and phase noise of the drive current, and the internal and external magnetic field fluctuations that influence amorphous wire impedance are considered. Using the Taylor expansion and neglecting the high-order terms, the voltage noise expression of the amorphous wire is deduced. According to the circuit structure and transfer function of the sensor, the voltage noise expression of the sensor is obtained. Finally the noise model of amorphous material magnetic sensor is deduced. Through analyzing the sensor noise model, it is known that increasing the feedback coefficient the output noise power spectrum density of the sensor can be reduced effectively. At last, experiment results confirm the correctness of the above analysis results.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2012年第11期2635-2640,共6页
Chinese Journal of Scientific Instrument
基金
中国博士后科学基金(20090460908)资助项目
关键词
磁传感器
非晶材料
噪声分析
magnetic sensor
amorphous material
noise analysis
作者简介
解伟男，分别于2002、2004和2008年在哈尔滨工业大学获得学士、硕士和博士学位，现为哈尔滨工业大学讲师，主要研究方向为磁场测量，地磁导航。E—mail：xieweinan@hit．edu．cn梁慧敏，分别于1993和1999年在哈尔滨工业大学获得学士和博士学位，现为哈尔滨工业大学教授，主要研究方向为永磁电器理论及应用技术。
