交直流弱磁场测量装置研究  

Study on Measuring Device for AC and DC Weak Magnetic Field

作　　者：牛红涛[1] 隋良红[1] 李兴贵[1] 郭乃理[1] 邓鑫林 NIU Hongtao;SUI Lianghong;LI Xinggui;GUO Naili;DENG Xinlin(National Institute of Measurement and Testing Technology,Chengdu Sichuan 610021,China;School of Manufacturing Science&Engineering,Sichuan University,Chengdu Sichuan 610065,China)

机构地区：[1]中国测试技术研究院,四川成都610021 [2]四川大学制造科学与工程学院,四川成都610065

出　　处：《机床与液压》2018年第16期103-106,共4页Machine Tool & Hydraulics

基　　金：四川省科技计划项目(2016GZ0023;2015GZ0163)

摘　　要：设计一款基于磁阻传感器的交直流微弱磁场信号测量装置,系统地介绍了测量装置的软硬件设计原理。采用基于ARM 32位处理器的STM32F407控制芯片对传感器采样信号进行数据处理和保存,具有良好的浮点数运算能力。利用傅里叶变换对磁场信号作频谱分析计算信号频率,并利用最小二乘法对实验数据进行拟合,得到线性度较好的磁场强度换算公式。通过交直流磁场标定实验证明了测量装置具有较高的准确度,运行可靠,可应用于监测周围环境的磁场强度。A measuring device for AC and DC weak magnetic field signals based on magnetoresistive sensors was developed.The design principles of the software and hardware for the measuring device were introduced.A microprocessor STM32F407 with ARM 32-bit Cortex TM-M4 CPU was applied for data processing and preservation of the sampling signals from the sensor in the system which showed good capability of floating-point operation.Fourier transform was applied to analyze the frequency spectrum of the magnetic field signals for frequency calculation.The least square method was applied to fit the experimental data,and the conversion formulas of magnetic field intensity with good linearity were obtained.The designed measuring device was proved to be accurate and stable by the calibration experiments of AC and DC magnetic field.It can be used to effectively monitor the ambient magnetic field intensity.

关 键 词：微弱磁场信号测量装置 磁阻传感器 傅里叶变换 交直流磁场 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置] TB972[自动化与计算机技术—控制科学与工程]