A SQUID gradiometer module with large junction shunt resistors

被引：5

作者：

Qiu Yang ^{[1
,2
,3
,4
]}

Liu Chao ^{[1
,2
,3
]}

Zhang Shu-Lin ^{[1
,2
,3
]}

Zhang Guo-Feng ^{[1
,2
,3
]}

Wang Yong-Liang ^{[1
,2
,3
]}

Li Hua ^{[1
,2
,3
,4
]}

Zeng Jia ^{[1
,2
,3
,4
]}

Kong Xiang-Yan ^{[1
,2
,3
]}

Xie Xiao-Ming ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, SIMIT, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

[2] Collaborat CAS Shanghai, Joint Res Lab Superconduct & Bioelect, Shanghai 200050, Peoples R China

[3] FZJ, D-52425 Julich, Germany

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

CHINESE PHYSICS B | 2014年 / 23卷 / 08期

关键词：

SQUID; gradiometer; magnetocardiography; MAGNETOMETER; ELECTRONICS;

D O I：

10.1088/1674-1056/23/8/088503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 Omega. 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.

引用

页数：3

共 11 条

[1]

Chesca B., 2004, SQUID HDB, VI, P46

[2] MAGNETOCARDIOGRAMS TAKEN INSIDE A SHIELDED ROOM WITH A SUPERCONDUCTING POINT-CONTACT MAGNETOMETER [J].