非晶材料磁传感器噪声分析  

Noise analysis of amorphous material magnetic sensor

作　　者：解伟男[1] 奚伯齐[1] 梁慧敏[2] 

机构地区：[1]哈尔滨工业大学空间控制与惯性技术研究中心,哈尔滨150080 [2]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《仪器仪表学报》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

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.

关 键 词：磁传感器 非晶材料 噪声分析 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TM937[自动化与计算机技术—控制科学与工程]