A compact and closed-loop spin-exchange relaxation-free atomic magnetometer for wearable magnetoencephalography  

作　　者：郭清乾 胡涛 冯晓宇 张明康 陈春巧 张欣 姚泽坤 徐佳玉 王青 付方跃 张寅 常严 杨晓冬 Qing-Qian Guo;Tao Hu;Xiao-Yu Feng;Ming-Kang Zhang;Chun-Qiao Chen;Xin Zhang;Ze-Kun Yao;Jia-Yu Xu;Qing Wang;Fang-Yue Fu;Yin Zhang;Yan Chang;Xiao-Dong Yang(Suzhou Institute of Biomedical Engineering and Technology,Chinese Academy of Sciences,Suzhou 215163,China;School of Biomedical Engineering(Suzhou),Division of Life Sciences and Medicine,University of Science and Technology of China,Hefei 230026,China;Jihua Laboratory,Foshan 528000,China;School of Electronic and Information Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]Suzhou Institute of Biomedical Engineering and Technology,Chinese Academy of Sciences,Suzhou 215163,China [2]School of Biomedical Engineering(Suzhou),Division of Life Sciences and Medicine,University of Science and Technology of China,Hefei 230026,China [3]Jihua Laboratory,Foshan 528000,China [4]School of Electronic and Information Engineering,Changchun University of Science and Technology,Changchun 130022,China

出　　处：《Chinese Physics B》2023年第4期277-282,共6页中国物理B（英文版）

基　　金：Project supported by Ji Hua Laboratory(Grant No.X190131TD190);the Research and Development Project for Equipment of Chinese Academy of Sciences(Grant No.YJKYYQ20210051);the Suzhou pilot project of basic research(Grant No.SJC2021024);the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20200215)。

摘　　要：Atomic magnetometers operated in the spin-exchange relaxation-free(SERF)regime are the promising sensor to replace superconducting quantum interference devices(SQUIDs)in the biomagnetism field.The SERF magnetometer with compact size and good performance is crucial to the new generation of wearable magnetoencephalography(MEG)system.In this paper,we developed a compact and closed-loop SERF magnetometer with the dimensions of 15.0×22.0×30.0 mm^(3)based on a single-beam configuration.The bandwidth of the magnetometer was extended to 675 Hz while the sensitivity was maintained at 22 f T/Hz^(1/2).A nearly 3-fold enhancement of the bandwidth was obtained in comparison with the open-loop control.The implementation of the closed-loop control also greatly improved the dynamic range,enabling the magnetometer to be robust against the disturbance of the ambient field.Moreover,the magnetometer was successfully applied for the detection of humanα-rhythm and auditory evoked fields(AEFs),which demonstrated the potential to be extended to multi-channel MEG measurements for future neuroscience studies.

关 键 词：atomic magnetometer MINIATURIZATION CLOSED-LOOP magnetoencephalography(MEG) 

分 类 号：R318.6[医药卫生—生物医学工程] O441.2[医药卫生—基础医学]