基于铯光泵磁力仪的地震地磁矢量测量系统  

Seismic geomagnetic vector measurement system based on optically pumped cesium magnetometer

作　　者：居海华[1,2] 张乐 夏忠 张岑[1] 应允翔[4] Ju Haihua;Zhang Le;Xia Zhong;Zhang Cen;Ying Yunxiang(Jiangsu Earthquake Agency,Nanjing 210014,China;School of Automation,China University of Geosciences,Wuhan 430074,China;Beijing Himag Technology Co.,Ltd.,Beijing 100141,China;Anhui Earthquake Agency,Hefei 230071,China)

机构地区：[1]江苏省地震局,南京210014 [2]中国地质大学自动化学院,武汉430074 [3]北京海迈格科技有限公司,北京100141 [4]安徽省地震局,合肥230071

出　　处：《仪器仪表学报》2023年第9期109-118,共10页Chinese Journal of Scientific Instrument

基　　金：中国地震局地震科技星火计划项目(XH21011);徐州市重点研发计划(社会发展)(KC20185)项目资助。

摘　　要：为解决地震地磁矢量观测中质子矢量磁力仪噪声大,长期观测中存在明显漂移,磁通门磁力仪温度效应明显,保温磁房投入大等问题,研制了基于铯光泵磁力仪的地震地磁矢量测量系统,本文详细介绍了其测量原理及仪器结构,设计了混合分量线圈装置,并开展了稳定性分析。研制的样机在蒙城地震台开展了观测实验。结果表明,实验期内记录良好,采样率达到1 Hz,1月份总强度、水平分量和磁偏角月噪声分别为0.01 nT、0.02 nT和0.003′,优于地震地磁观测基本网质子矢量磁力仪最好噪声水平,也优于同场地两台磁通门磁力仪的噪声水平和基准网的平均噪声水平。其实验期内水平分量和磁偏角最大漂移分别为1.3 nT和0.16′,小于座钟式质子矢量磁力仪基线漂移,具有良好的稳定性。To solve the problems of high noise and obvious drift in long-term observation of proton vector magnetometer,obvious temperature effect of fluxgate magnetic field meter and large investment in thermal insulation magnetic room,a seismic geomagnetic vector measurement system based on the optically pumped cesium magnetometer is developed.In this article,the measuring principle and instrument structure are introduced in detail,the mixed-component coil device is designed,and the stability is analyzed.The prototype is tested at the Mengcheng seismic station.The results show that,during the experimental period,the instrument records well,the sampling rate of the experimental instrument reaches 1 Hz,the monthly noise of the total intensity,the horizontal component and the magnetic declination in January are 0.01 nT,0.02 nT and 0.003′,respectively,which are obviously superior to the best noise level of proton vector magnetometers of seismic geomagnetic observation basic network.They are also better than the noise level of two fluxgate magnetic field meters at the same venue and the average noise level of the seismic geomagnetic observation reference network.The maximum drift of the horizontal component and the magnetic declination are 1.3 nT and 0.16′,respectively,which is less than the baseline drift of the pedestal-clock proton vector magnetometer,so good stability can be obtained.

关 键 词：铯光泵磁力仪 分量线圈装置 矢量磁力仪 噪声水平 基线偏离值 

分 类 号：TH762[机械工程—仪器科学与技术]