Progress in Superconductivity
- 제8권2호
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- Pages.164-168
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- 2007
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- 1229-4764(pISSN)
DROS 자력계의 동작특성 및 심자도 측정
The characteristics of DROS magnetometer and MCG measurement
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Kang, C.S.
(Department of Physics, Korea University) ;
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Lee, Y.H.
(Bio-signal Research Center, Korea Research Institute of Standards and Science) ;
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Kwon, H.
(Bio-signal Research Center, Korea Research Institute of Standards and Science) ;
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Kim, J.M.
(Bio-signal Research Center, Korea Research Institute of Standards and Science) ;
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Yu, K.K.
(Bio-signal Research Center, Korea Research Institute of Standards and Science) ;
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Park, Y.K.
(Bio-signal Research Center, Korea Research Institute of Standards and Science) ;
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Lee, S.G.
(Department of Physics, Korea University)
- 발행 : 2007.04.30
초록
We developed a SQUID magnetometer based on Double Relaxation Oscillation SQUID(DROS) for measuring magnetocardiography(MCG). Since DROS provides a 10 times larger flux-to-voltage transfer coefficient than the conventional DC-SQUID, simple flux-locked loop electronics could be used for SQUID operation. Especially, we adopted an external feedback to eliminate the magnetic coupling with adjacent channels. When the DROS magnetometer was operated inside a magnetically shielded room, average magnetic field noise was about 5