中国物理B ›› 2015, Vol. 24 ›› Issue (2): 28501-028501.doi: 10.1088/1674-1056/24/2/028501

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Baseline optimization of SQUID gradiometer for magnetocardiography

李华a b c, 张树林a b, 邱阳a b c, 张永升a b, 张朝祥a b, 孔祥燕a b, 谢晓明a b   

  1. a State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences (CAS), Shanghai 200050, China;
    b Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration Between CAS-Shanghai, Shanghai 200050, People's Republic of China and FZJ, D-52425 Julich, Germany;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2014-07-21 修回日期:2014-09-24 出版日期:2015-02-05 发布日期:2015-02-05
  • 基金资助:
    Project supported by the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB04020200) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KGCX2-EW-105).

Baseline optimization of SQUID gradiometer for magnetocardiography

Li Hua (李华)a b c, Zhang Shu-Lin (张树林)a b, Qiu Yang (邱阳)a b c, Zhang Yong-Sheng (张永升)a b, Zhang Chao-Xiang (张朝祥)a b, Kong Xiang-Yan (孔祥燕)a b, Xie Xiao-Ming (谢晓明)a b   

  1. a State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences (CAS), Shanghai 200050, China;
    b Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration Between CAS-Shanghai, Shanghai 200050, People's Republic of China and FZJ, D-52425 Julich, Germany;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-07-21 Revised:2014-09-24 Online:2015-02-05 Published:2015-02-05
  • Contact: Zhang Shu-Lin, Kong Xiang-Yan E-mail:zhangsl@mail.sim.ac.cn;xykong@mail.sim.ac.cn
  • Supported by:
    Project supported by the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB04020200) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KGCX2-EW-105).

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摘要： SQUID gradiometer techniques are widely used in noise cancellation for biomagnetic measurements. An appropriate gradiometer baseline is very important for the biomagnetic detection with high performance. By placing several magnetometers at different heights along the vertical direction, we could simultaneously obtain the synthetic gradiometers with different baselines. By using the traditional signal-to-noise ratio (SNR) as a performance index, we successfully obtain an optimal baseline for the magnetocardiography (MCG) measurement in a magnetically shielded room (MSR). Finally, we obtain an optimal baseline of 7 cm and use it for the practical MCG measurement in our MSR. The SNR about 38 dB is obtained in the recorded MCG signal.

关键词: SQUID, gradiometer, baseline optimization, magnetocardiography

Abstract: SQUID gradiometer techniques are widely used in noise cancellation for biomagnetic measurements. An appropriate gradiometer baseline is very important for the biomagnetic detection with high performance. By placing several magnetometers at different heights along the vertical direction, we could simultaneously obtain the synthetic gradiometers with different baselines. By using the traditional signal-to-noise ratio (SNR) as a performance index, we successfully obtain an optimal baseline for the magnetocardiography (MCG) measurement in a magnetically shielded room (MSR). Finally, we obtain an optimal baseline of 7 cm and use it for the practical MCG measurement in our MSR. The SNR about 38 dB is obtained in the recorded MCG signal.

Key words: SQUID, gradiometer, baseline optimization, magnetocardiography

中图分类号:  (Superconducting quantum interference devices (SQUIDs))

  • 85.25.Dq
07.55.Ge (Magnetometers for magnetic field measurements) 87.55.de (Optimization) 52.70.Ds (Electric and magnetic measurements)