A SQUID gradiometer module with large junction shunt resistors

doi:10.1088/1674-1056/23/8/088503

›› 2014, Vol. 23 ›› Issue (8): 88503-088503.doi: 10.1088/1674-1056/23/8/088503

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

A SQUID gradiometer module with large junction shunt resistors

邱阳^{a b c}, 刘超^{a b}, 张树林^{a b}, 张国峰^{a b}, 王永良^{a b}, 李华^{a b c}, 曾佳^{a b c}, 孔祥燕^{a b}, 谢晓明^{a b}

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:2014-02-10 修回日期:2014-03-12 出版日期:2014-08-15 发布日期:2014-08-15
基金资助:
Project supported by the Main Direction Program of Knowledge Innovation of the Chinese Academy of Sciences (Grant No.KGCX2-EW-105) and the "100 Talents Project" of the Chinese Academy of Sciences and Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04020200).

A SQUID gradiometer module with large junction shunt resistors

Qiu Yang (邱阳)^{a b c}, Liu Chao (刘超)^{a b}, Zhang Shu-Lin (张树林)^{a b}, Zhang Guo-Feng (张国峰)^{a b}, Wang Yong-Liang (王永良)^{a b}, Li Hua (李华)^{a b c}, Zeng Jia (曾佳)^{a b c}, Kong Xiang-Yan (孔祥燕)^{a b}, Xie Xiao-Ming (谢晓明)^{a b}

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:2014-02-10 Revised:2014-03-12 Online:2014-08-15 Published:2014-08-15
Contact: Kong Xiang-Yan E-mail:xykong@mail.sim.ac.cn
Supported by:
Project supported by the Main Direction Program of Knowledge Innovation of the Chinese Academy of Sciences (Grant No.KGCX2-EW-105) and the "100 Talents Project" of the Chinese Academy of Sciences and Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04020200).

摘要/Abstract

摘要： A dual-washer superconducting quantum interference device (SQUID) with a loop inductance of 350 pH and two on-washer integrated input coils is designed according to conventional niobium technology. In order to obtain a large SQUID flux-to-voltage transfer coefficient, the junction shunt resistance is selected to be 33 Ω. A vertical SQUID gradiometer module with a baseline of 100 mm is constructed by utilizing such a SQUID and a first-order niobium wire-wound antenna. The sensitivity of this module reaches about 0.2 fT/(cm·Hz^1/2) in the white noise range using a direct readout scheme, i.e., the SQUID is directly connected to an operational amplifier, in a magnetically shielded room. Some magnetocardiography (MCG) measurements with a sufficiently high signal-to-noise ratio (SNR) are demonstrated.

关键词: SQUID, gradiometer, magnetocardiography

Abstract: A dual-washer superconducting quantum interference device (SQUID) with a loop inductance of 350 pH and two on-washer integrated input coils is designed according to conventional niobium technology. In order to obtain a large SQUID flux-to-voltage transfer coefficient, the junction shunt resistance is selected to be 33 Ω. A vertical SQUID gradiometer module with a baseline of 100 mm is constructed by utilizing such a SQUID and a first-order niobium wire-wound antenna. The sensitivity of this module reaches about 0.2 fT/(cm·Hz^1/2) in the white noise range using a direct readout scheme, i.e., the SQUID is directly connected to an operational amplifier, in a magnetically shielded room. Some magnetocardiography (MCG) measurements with a sufficiently high signal-to-noise ratio (SNR) are demonstrated.

Key words: SQUID, gradiometer, magnetocardiography

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

85.25.Dq

07.55.Ge (Magnetometers for magnetic field measurements) 52.70.Ds (Electric and magnetic measurements)

邱阳, 刘超, 张树林, 张国峰, 王永良, 李华, 曾佳, 孔祥燕, 谢晓明. A SQUID gradiometer module with large junction shunt resistors[J]. , 2014, 23(8): 88503-088503.

Qiu Yang (邱阳), Liu Chao (刘超), Zhang Shu-Lin (张树林), Zhang Guo-Feng (张国峰), Wang Yong-Liang (王永良), Li Hua (李华), Zeng Jia (曾佳), Kong Xiang-Yan (孔祥燕), Xie Xiao-Ming (谢晓明). A SQUID gradiometer module with large junction shunt resistors[J]. Chin. Phys. B, 2014, 23(8): 88503-088503.

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A SQUID gradiometer module with large junction shunt resistors

A SQUID gradiometer module with large junction shunt resistors

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