A SQUID gradiometer module with large junction shunt resistors

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

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.

Keywords: SQUID gradiometer magnetocardiography

Received: 10 February 2014
Revised: 12 March 2014
Accepted manuscript online:

PACS:	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	07.55.Ge	(Magnetometers for magnetic field measurements)
	52.70.Ds	(Electric and magnetic measurements)

Fund: 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).

Corresponding Authors: Kong Xiang-Yan
E-mail: xykong@mail.sim.ac.cn

Cite this article:

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 2014 Chin. Phys. B 23 088503

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