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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 |
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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.
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Received: 12 January 2015
Revised: 09 February 2015
Accepted manuscript online:
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PACS:
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85.25.Dq
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(Superconducting quantum interference devices (SQUIDs))
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07.55.Ge
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(Magnetometers for magnetic field measurements)
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87.85.Pq
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(Biomedical imaging)
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43.50.+y
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(Noise: its effects and control)
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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: xykong@mail.sim.ac.cn
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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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