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Chin. Phys. B, 2015, Vol. 24(7): 078501    DOI: 10.1088/1674-1056/24/7/078501

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
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
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.
Keywords:  superconducting quantum interference devices      magnetometer      magnetocardiography      noise cancellation  
Received:  12 January 2015      Revised:  09 February 2015      Accepted manuscript online: 
PACS:  85.25.Dq (Superconducting quantum interference devices (SQUIDs))  
  07.55.Ge (Magnetometers for magnetic field measurements)  
  87.85.Pq (Biomedical imaging)  
  43.50.+y (Noise: its effects and control)  
Fund: 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).
Corresponding Authors:  Kong Xiang-Yan     E-mail:

Cite this article: 

Qiu Yang (邱阳), Li Hua (李华), Zhang Shu-Lin (张树林), Wang Yong-Liang (王永良), Kong Xiang-Yan (孔祥燕), Zhang Chao-Xiang (张朝祥), Zhang Yong-Sheng (张永升), Xu Xiao-Feng (徐小峰), Yang Kang (杨康), Xie Xiao-Ming (谢晓明) Low-Tc direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room 2015 Chin. Phys. B 24 078501

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