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

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【作者】邱阳；李华；张树林；王永良；孔祥燕；张朝祥；张永升；徐小峰；杨康；谢晓明；

【Author】 Qiu Yang;Li Hua;Zhang Shu-Lin;Wang Yong-Liang;Kong Xiang-Yan;Zhang Chao-Xiang;Zhang Yong-Sheng;Xu Xiao-Feng;Yang Kang;Xie Xiao-Ming;State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences;Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration between Chinese Academy of Sciences–Shanghai;University of Chinese Academy of Sciences;

【机构】 State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences； Joint Research Laboratory on Superconductivity and Bioelectronics,Collaboration between Chinese Academy of Sciences–Shanghai； University of Chinese Academy of Sciences；

【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–Mc Cumber 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 / Φ larger than 420 μV/Φ0, the SQUID magnetometers had a white noise level of about 5.5 f T·Hz-1/2when 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 d B were done successfully using the developed system.更多还原

【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–Mc Cumber 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 / Φ larger than 420 μV/Φ0, the SQUID magnetometers had a white noise level of about 5.5 f T·Hz-1/2when 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 d B were done successfully using the developed system.更多还原

【关键词】 superconducting quantum interference devices； magnetometer； magnetocardiography； noise can-cellation；
【Key words】 superconducting quantum interference devices； magnetometer； magnetocardiography； noise can-cellation；

【基金】 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)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2015年07期

【分类号】O441.5
【被引频次】2
【下载频次】72

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