小型SERF原子磁力计三轴静磁场主动补偿电路设计  

Circuit Design for Triaxial Static Magnetic Field Active Compensation of Compact SERF Atomic Magnetometer

作　　者：姚泽坤 王青 郭清乾[2,3,4] 冯晓宇 胡涛 张寅 吴中毅[2,4] 常严 杨晓冬[1,2,3,4] YAO Zekun;WANG Qing;GUO Qingqian;FENG Xiaoyu;HU Tao;ZHANG Yin;WU Zhongyi;CHANG Yan;YANG Xiaodong(School of Electronic and Information Engineering,Changchun University of Science and Technology,Changchun 130022,China;Suzhou Institute of Biomedical Engineering and Technology,Chinese Academy of Sciences,Suzhou 215163,China;School of Biomedical Engineering(Suzhou),University of Science and Technology of China,Hefei 230026,China;Jihua Laboratory,Foshan 528200,China;Jinan Guoke Medical Technology Development Co.,Ltd.,Jinan 250101 China)

机构地区：[1]长春理工大学电子信息工程学院,吉林长春130022 [2]中国科学院苏州生物医学工程技术研究所,江苏苏州215163 [3]中国科学技术大学生物医学工程学院(苏州),安徽合肥230026 [4]季华实验室,广东佛山528200 [5]济南国科医工科技发展有限公司,山东济南250101

出　　处：《仪表技术与传感器》2023年第11期40-44,50,共6页Instrument Technique and Sensor

基　　金：苏州市基础研究试点项目(SJC2021024);江苏省自然科学基金项目(BK20200215);中科院科研装备研制项目(YJKYYQ20210051);季华实验室项目(X190131TD190);山东省自然科学基金青年项目(ZR2022QF098)。

摘　　要：无自旋交换弛豫(SERF)原子磁力计是当前灵敏度最高的磁场测量传感器,具有广泛的应用前景。而小型SERF原子磁力计易受到地磁环境及内部元件剩磁影响,需对磁力计周围剩磁进行补偿,使其工作在近乎零磁场环境下(<1 nT),以实现高量灵敏度测量。对此,文中基于现场可编程门阵列(FPGA)设计开发了单泵浦光小型SERF原子磁力计三轴静磁场主动补偿控制电路,通过对原子磁力计三轴线圈施加直流扫描磁场,快速准确实现了-60~60 nT三轴磁场同步补偿。测量轴方向平均补偿精度分别达到0.12 nT和0.25 nT,泵浦光轴方向平均补偿精度达到0.36 nT,可满足小型SERF原子磁力计高灵敏测量要求。Spin-exchange-relaxation-free(SERF)atomic magnetometers are the most sensitive magnetic field sensors,which have a wide application prospect.Due to the effect of the geomagnetic environment and residual magnetism of internal components for compact SERF atomic magnetometers,it is necessary to compensate the residual magnetism near zero(<1 nT)to achieve high sensitive measurement.In this paper,a triaxial static magnetic field active compensation circuit for single-beam compact SERF atomic magnetometer based on the field programmable gate array(FPGA)was designed.By applying DC scanning magnetic fields to the three-axis coils of the atomic magnetometer,-60 nT to 60 nT three-axis magnetic field synchronous compensation was realized quickly and accurately.The average compensation accuracy can reach 0.12 nT and 0.25 nT in the measuring directions respectively and 0.36 nT in the pump light direction,which meet the requirement of high sensitive measurement of compact SERF atomic magnetometer.

关 键 词：原子磁力计 三轴磁场补偿 FPGA电路 磁场扫描法 

分 类 号：TM936[电气工程—电力电子与电力传动]