Journal
CHINESE PHYSICS B
Volume 24, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/24/2/028501
Keywords
SQUID; gradiometer; baseline optimization; magnetocardiography
Categories
Funding
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB04020200]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KGCX2-EW-105]
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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.
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