中国物理B ›› 2015, Vol. 24 ›› Issue (7): 78501-078501.doi: 10.1088/1674-1056/24/7/078501

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

Low-Tc direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

邱阳a b c, 李华a b c, 张树林a b, 王永良a b, 孔祥燕a b, 张朝祥a b, 张永升a b, 徐小峰a b, 杨康a b c, 谢晓明a b   

  1. a State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
    b Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration between Chinese Academy of Sciences-Shanghai, Shanghai 200050, China and FZJ, D-52425 Julich, Germany;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2015-01-12 修回日期:2015-02-09 出版日期:2015-07-05 发布日期:2015-07-05
  • 基金资助:
    Project supported by "One Hundred Persons Project" of the Chinese Academy of Sciences and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04020200).

Low-Tc direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

Qiu Yang (邱阳)a b c, Li Hua (李华)a b c, Zhang Shu-Lin (张树林)a b, Wang Yong-Liang (王永良)a b, Kong Xiang-Yan (孔祥燕)a b, Zhang Chao-Xiang (张朝祥)a b, Zhang Yong-Sheng (张永升)a b, Xu Xiao-Feng (徐小峰)a b, Yang Kang (杨康)a b c, 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, Chinese Academy of Sciences, Shanghai 200050, China;
    b Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration between Chinese Academy of Sciences-Shanghai, Shanghai 200050, China and FZJ, D-52425 Julich, Germany;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-01-12 Revised:2015-02-09 Online:2015-07-05 Published:2015-07-05
  • Contact: Kong Xiang-Yan E-mail:xykong@mail.sim.ac.cn
  • Supported by:
    Project supported by "One Hundred Persons Project" of the Chinese Academy of Sciences and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04020200).

摘要: We constructed a 36-channel magnetocardiography (MCG) system based on low-Tc direct current (DC) superconducting quantum interference device (SQUID) magnetometers operated inside a magnetically shielded room (MSR). Weakly damped SQUID magnetometers with large Steward–McCumber parameter βc (βc ≈ 5), which could directly connect to the operational amplifier without any additional feedback circuit, were used to simplify the readout electronics. With a flux-to-voltage transfer coefficient ∂V/∂Ø larger than 420 μV/Ø0, the SQUID magnetometers had a white noise level of about 5.5 fT·Hz-1/2 when operated in MSR. 36 sensing magnetometers and 15 reference magnetometers were employed to realize software gradiometer configurations. The coverage area of the 36 sensing magnetometers is 210× 210 mm2. MCG measurements with a high signal-to-noise ratio of 40 dB were done successfully using the developed system.

关键词: superconducting quantum interference devices, magnetometer, magnetocardiography, noise cancellation

Abstract: We constructed a 36-channel magnetocardiography (MCG) system based on low-Tc direct current (DC) superconducting quantum interference device (SQUID) magnetometers operated inside a magnetically shielded room (MSR). Weakly damped SQUID magnetometers with large Steward–McCumber parameter βc (βc ≈ 5), which could directly connect to the operational amplifier without any additional feedback circuit, were used to simplify the readout electronics. With a flux-to-voltage transfer coefficient ∂V/∂Ø larger than 420 μV/Ø0, the SQUID magnetometers had a white noise level of about 5.5 fT·Hz-1/2 when operated in MSR. 36 sensing magnetometers and 15 reference magnetometers were employed to realize software gradiometer configurations. The coverage area of the 36 sensing magnetometers is 210× 210 mm2. MCG measurements with a high signal-to-noise ratio of 40 dB were done successfully using the developed system.

Key words: superconducting quantum interference devices, magnetometer, magnetocardiography, noise cancellation

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

  • 85.25.Dq
07.55.Ge (Magnetometers for magnetic field measurements) 87.85.Pq (Biomedical imaging) 43.50.+y (Noise: its effects and control)