第22卷
第7期
2014年7月
文章编号
1004924X(2014)07-180806
光学精密工程
Optics and Precision Engineering
Vol.22No.7
Jul,2014
无自旋交换弛豫原子磁强计的主动磁补偿
楚中毅，孙晓光*，万双爱，房建成
（北京航空航天大学仅器科学与光电工程学院北京航空航天大学惯性技术重点实验室，北京100191）摘要：由于外界磁场扰动会降低无自旋交换豫（SERF)原子磁强计的磁场测量灵敏度，本文根据SERF原子磁强计的测量原理，提出了一种基于原位磁测补偿外部磁场扰动的方法。该方法通过调制解调的方法对3个方向的磁场进行解耦，实现3个方向磁场信息的独立测量。然后，将3个方向磁场的测量信息作为反馈，调节电流源输出给线圈的电流，使线圈产生一个与外界扰动磁场大小相同方向相反的补偿磁场。最后，在现有的SERF原子磁强计实验平台上搭建了主动磁补偿系统，实现了对外部扰动磁场的补偿。与手动补偿方式相比，本文提出的主动磁补偿方法可将剩余磁场的平均值从0.3178nT降低到0.0404nT，同时将剩余磁场的均方差由0.3481nT降低到0.0247nT。得到的实验结果验证了本文所述方法的有效性。
关键词：原子磁强计；主动磁补偿；无自旋弛豫状态；解揭；原位磁测
中图分类号：TM937
文献标识码：A
doi;10.3788/OPE.20142207.1808
Activemagneticcompensationof
spin-exchange-relaxation-freeatomicmagnetometer CHU Zhong-yi,SUNXiao-guang',WAN Shuang-ai,FANGJian-cheng
(Scienceand Technology onInertial Laboratory,School of InstrumentationScienceand
Opto-electronicsEngineering,BeihangUniversity,Beijing100191,China)
Correspondingauthor,E-mail.136072016@163.com
Abstract：Asthemeasuringsensitivityof aSpin-Exchange-Relaxation-Free（SERF）atomic magnetometer will be reduced when it is suffered from the disturbance by environment magnetic field. Therefore, according to the measuring principle of the SERF atomic magnetometer, this paper proposes a active magnetic compensation method for the external magnetic field disturbance based on in-situ magnetic measurement. Firstly, a modem was used to decouple the magnetic field in three directions to achieve the magnetic information of the three axes. Then, the measuring information from three directions was taken as a feedback to adjust the current of coil to generate a magnetic field which is opposite and equal to the disturbance, Finally, an active magnetic compensation system for SERF atomic magnetometer was built to compensate the magnetic disturbance in real time. Compared with the manual compensation method, the proposed method reduces the surplus magnetic field from 0.317 8 nT to 0. 040 4 nT, and the mean square error from 0.348 1 nT to 0.024 7 nT.The experimental results validate the efficiency of the active magnetic compensation method.
收稿日期：2013-12-07；修订日期：2014-01-25.
基金项目：国家自然科学基金国家重大科研仪器专项基金资助项目（No.61227902)