Construction of a 40-channel SQUID System and Its Application to Neuromagnetic Measurements

Lee, Y.H.; Kim, J.M.; Kwon, H.C.; Park, Y.K.; Park, J.C.; Lee, D.H.; Ahn, C.B.

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자료유형: 학술저널

저자정보: Lee, Y.H. (Superconductivity Group, Korea Research Institute of Standards and Science) Kim, J.M. (Superconductivity Group, Korea Research Institute of Standards and Science) Kwon, H.C. (Superconductivity Group, Korea Research Institute of Standards and Science) Park, Y.K. (Superconductivity Group, Korea Research Institute of Standards and Science) Park, J.C. (Superconductivity Group, Korea Research Institute of Standards and Science) Lee, D.H. (Department of Electrical Engineering, Kwangwoon University) Ahn, C.B. (Department of Electrical Engineering, Kwangwoon University)

저널정보: 한국초전도학회 Progress in superconductivity Progress in superconductivity 제2권 제1호

발행연도: 2000.1

수록면: 20 - 26 (7page)

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이 논문의 연구 히스토리 (2)

2003

Design of 150-channel Whole Head SQUID Magnetometer System for Neuromagnetic Measurements

Lee , Y.H. , Kim 외 12명 한국초전도학회 High Temperature Superconductivity 2003.01 학술대회자료

2000

Construction of a 40-channel SQUID System and Its Application to Neuromagnetic Measurements

Lee , Y.H. , Kim 외 13명 Progress in superconductivity 2000.01 학술저널

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A 40-channel superconducting quantum interference device (SQUID) system was constructed for measuring neuromagnetic fields. Main features of the system are the use of double relaxation oscillation SQUIDs (DROSs), and planar gradiometers measuring magnetic field components tangential to the head surface. The DROSs with high flux-to-voltage transfers enabled direct readout of the SQUID output by room-temperature dc preamplifiers and simple flux-locked loop circuits could be used for SQUID operation. The pickup coil is an integrated first-order planar gradiometer with a baseline of 40 mm. Average noise level of the 40 channels is around 1.2 $fT/cm/{\surd}Hz$ at 100 Hz, corresponding to a field noise of 5 $fT/{\surd}Hz$, operated inside a magnetically shielded room. The SQUID insert was designed to have low thermal load, minimizing the loss of liquid helium. The constructed system was applied to measure auditory-evoked neuromagnetic fields.

#SQUID #low-field measurement #biomagnetism

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