基于OVERHAUSER效应磁探头的矢量磁场测量仪  

Developed vector magnetometer based on OVERHAUSER effect sensor

作　　者：王晓美[1] 滕云田[1] 范晓勇[1] 王晨[1] 王喆[1] Wang Xiaomei;Teng Yuntian;Fan Xiaoyong;Wang Chen;Wang Zhe(Institute of Geophysics,China Earthquake Administration,Be~＇ing 100081,China)

机构地区：[1]中国地震局地球物理研究所

出　　处：《仪器仪表学报》2018年第8期91-97,共7页Chinese Journal of Scientific Instrument

基　　金：国家重大科学仪器设备开发专项(2014YQ100817-2)资助

摘　　要：为了获取多分量的地磁场信息,设计了基于OVERHAUSER效应磁探头的矢量磁场测量仪。首先详细阐述矢量磁场测量的工作原理,分析磁偏角、磁倾角与总强度的几何关系,确定一组正交偏置线圈的磁轴方向和一个测量周期所得测量数据的数学关系;然后分析正交偏置球形线圈的均匀区和偏置磁场的幅度对研制测量仪的噪声影响。为验证理论分析,在地磁台站对研制测量仪的性能进行测试和对比观测。结果表明,球形线圈的非均匀度优于5‰,偏置磁场幅度约为总强度磁场幅度的20%左右可以获得较好的噪声性能,总强度F、磁偏角D和磁倾角I的噪声（峰峰值）分别为0.19 n T、0.002 9°、0.003 3°。To obtain the multi-component geomagnetic information,a new vector magnetometer based on OVERHAUSER effect is proposed in this paper. Firstly,the detailed description of the measurement principle and the review of formulae used for inclination,declination and total field component calculations are given. The orientation of the magnetic axis of a set of orthogonal bias coils and relationship of measurement data during a measurement cycle are determined and analyzed. Then noise level of prototype,which is affected by the homogeneity of spherical coils and the amplitude of the bias magnetic field,is estimated and discussed. In order to verify the theoretical analysis,the prototype is set up based on geomagnetic observatory for testing performances. Experimental results show that the non-homogeneity of spherical coils is better than 5‰,the optimal noise performance under the condition of amplitude of the bias magnetic field is about 20% of total field,and the noise of total intensity F,magnetic declination D and magnetic inclination I is0. 19 n T,0. 002 9° and 0. 003 3°,respectively.

关 键 词：OVERHAUSER效应磁探头 磁偏角 磁倾角 球形线圈 偏置磁场 

分 类 号：TH762[机械工程—仪器科学与技术]