Baseline optimization of SQUID gradiometer for magnetocardiography

doi:10.1088/1674-1056/24/2/028501

Abstract SQUID gradiometer techniques are widely used in noise cancellation for biomagnetic measurements. An appropriate gradiometer baseline is very important for the biomagnetic detection with high performance. By placing several magnetometers at different heights along the vertical direction, we could simultaneously obtain the synthetic gradiometers with different baselines. By using the traditional signal-to-noise ratio (SNR) as a performance index, we successfully obtain an optimal baseline for the magnetocardiography (MCG) measurement in a magnetically shielded room (MSR). Finally, we obtain an optimal baseline of 7 cm and use it for the practical MCG measurement in our MSR. The SNR about 38 dB is obtained in the recorded MCG signal.

Keywords: SQUID gradiometer baseline optimization magnetocardiography

Received: 21 July 2014
Revised: 24 September 2014
Accepted manuscript online:

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

Fund: Project supported by the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB04020200) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KGCX2-EW-105).

Corresponding Authors: Zhang Shu-Lin, Kong Xiang-Yan
E-mail: zhangsl@mail.sim.ac.cn;xykong@mail.sim.ac.cn

Cite this article:

Li Hua (李华), Zhang Shu-Lin (张树林), Qiu Yang (邱阳), Zhang Yong-Sheng (张永升), Zhang Chao-Xiang (张朝祥), Kong Xiang-Yan (孔祥燕), Xie Xiao-Ming (谢晓明) Baseline optimization of SQUID gradiometer for magnetocardiography 2015 Chin. Phys. B 24 028501

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