基于磁通门传感器的弱磁场检测方法  

Detection Method of Weak Magnetic Field Based on Fluxgate Sensor

作　　者：杨理践[1] 涂传宾 高松巍[1] 

机构地区：[1]沈阳工业大学信息科学与工程学院,辽宁沈阳110870

出　　处：《仪表技术与传感器》2014年第9期84-87,共4页Instrument Technique and Sensor

基　　金：国家自然科学基金资助项目(60927004;61141004);十二五国家科技部支撑计划资助项目(2011BAK06B01-03)

摘　　要：为了实现对弱磁场的检测,研究了磁通门传感器原理,建立了磁通门传感器数学模型;采用高磁导率材料钴基非晶合金VITROVAC6025Z作为磁芯材料设计制作了磁通门传感器,结合DDS(直接频率合成器)激励电路和虚拟仪器构成磁通门磁强计。虚拟仪器上磁场调零功能可实现磁通门磁强计在不同磁场环境下的归零校准,对弱磁场的测量更加精确。经对比实验,选择激励信号频率为10 kHz,激励幅值为5 V,此时该系统灵敏度较高。在稳定可控磁场中,利用特斯拉计对系统进行定标,实验结果表明,磁通门磁强计线性度较好,分辨力达μT级。In order to realize the detection of weak magnetic field, studied the principle of fluxgate sensor and established mathematical model of fluxgate sensor. Using high permeability material Co-based amorphous alloy-VITROVAC 6025Z as core ma- terial, we designed and made fluxgate sensor, which combined with DDS（ direct frequency synthesizer）driver circuit and virtual in- strument to form the fluxgate magnetometer. The function of adjust to zero of virtual instrument can realize fluxgate magnetometer zero calibration under different magnetic field environment, and measure the weak magnetic field more accurate. By contrast experiment, the system sensitivity was higher when excitation frequency sas 10K and the excitation amplitude was 5V. In the stable and controllable magnetic field, by using teslameter calibration system, the experimental results show that fluxgate magnetometer has good linearity and a resolution of uT.

关 键 词：磁通门 虚拟仪器 DDS 钴基非晶合金 弱磁场检测 线性拟合 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]