Emulation Circuit for Superconducting Quantum Interference Device (SQUID) Sensor in Magnetocardiography System

Chang-Beom AHN; Dong-Hoon LEE; Hochong PARK; Seoung-Jun OH

doi:10.1093/ietfec/e89-a.6.1688

Emulation Circuit for Superconducting Quantum Interference Device (SQUID) Sensor in Magnetocardiography System

Chang-Beom AHN, Dong-Hoon LEE, Hochong PARK, Seoung-Jun OH

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The superconducting quantum interference device (SQUID) is a transducer that converts magnetic flux into voltage. Its range of linear conversion, however, is very restricted. To overcome its narrow dynamic range, a flux-locked loop (FLL) is used to feedback the output field to cancel the input field. This prevents the operating point of the SQUID from moving far away from the null point. In this paper, an emulator for the SQUID sensor and the feedback coil has been proposed. Magnetic coupling between the original field and the generated field by the feedback coil was emulated by electronic circuits. By using the emulator, FLL circuits can be analyzed and optimized without use of SQUID sensors. This is a useful feature, especially in the early stage of development of the MCG system when a magnetically shielded room or real SQUID sensors may not yet be available. The emulator may also be used as a test signal generator for multi-channel gain calibration and for system maintenance.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E89-A No.6 pp.1688-1689

Publication Date: 2006/06/01

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Online ISSN: 1745-1337

DOI: 10.1093/ietfec/e89-a.6.1688

Type of Manuscript: Special Section LETTER (Special Section on Papers Selected from 2005 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC2005))

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Chang-Beom AHN, Dong-Hoon LEE, Hochong PARK, Seoung-Jun OH, "Emulation Circuit for Superconducting Quantum Interference Device (SQUID) Sensor in Magnetocardiography System" in IEICE TRANSACTIONS on Fundamentals, vol. E89-A, no. 6, pp. 1688-1689, June 2006, doi: 10.1093/ietfec/e89-a.6.1688.
Abstract: The superconducting quantum interference device (SQUID) is a transducer that converts magnetic flux into voltage. Its range of linear conversion, however, is very restricted. To overcome its narrow dynamic range, a flux-locked loop (FLL) is used to feedback the output field to cancel the input field. This prevents the operating point of the SQUID from moving far away from the null point. In this paper, an emulator for the SQUID sensor and the feedback coil has been proposed. Magnetic coupling between the original field and the generated field by the feedback coil was emulated by electronic circuits. By using the emulator, FLL circuits can be analyzed and optimized without use of SQUID sensors. This is a useful feature, especially in the early stage of development of the MCG system when a magnetically shielded room or real SQUID sensors may not yet be available. The emulator may also be used as a test signal generator for multi-channel gain calibration and for system maintenance.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e89-a.6.1688/_p

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@ARTICLE{e89-a_6_1688,
author={Chang-Beom AHN, Dong-Hoon LEE, Hochong PARK, Seoung-Jun OH, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Emulation Circuit for Superconducting Quantum Interference Device (SQUID) Sensor in Magnetocardiography System},
year={2006},
volume={E89-A},
number={6},
pages={1688-1689},
abstract={The superconducting quantum interference device (SQUID) is a transducer that converts magnetic flux into voltage. Its range of linear conversion, however, is very restricted. To overcome its narrow dynamic range, a flux-locked loop (FLL) is used to feedback the output field to cancel the input field. This prevents the operating point of the SQUID from moving far away from the null point. In this paper, an emulator for the SQUID sensor and the feedback coil has been proposed. Magnetic coupling between the original field and the generated field by the feedback coil was emulated by electronic circuits. By using the emulator, FLL circuits can be analyzed and optimized without use of SQUID sensors. This is a useful feature, especially in the early stage of development of the MCG system when a magnetically shielded room or real SQUID sensors may not yet be available. The emulator may also be used as a test signal generator for multi-channel gain calibration and for system maintenance.},
keywords={},
doi={10.1093/ietfec/e89-a.6.1688},
ISSN={1745-1337},
month={June},}

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TY - JOUR
TI - Emulation Circuit for Superconducting Quantum Interference Device (SQUID) Sensor in Magnetocardiography System
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1688
EP - 1689
AU - Chang-Beom AHN
AU - Dong-Hoon LEE
AU - Hochong PARK
AU - Seoung-Jun OH
PY - 2006
DO - 10.1093/ietfec/e89-a.6.1688
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E89-A
IS - 6
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - June 2006
AB - The superconducting quantum interference device (SQUID) is a transducer that converts magnetic flux into voltage. Its range of linear conversion, however, is very restricted. To overcome its narrow dynamic range, a flux-locked loop (FLL) is used to feedback the output field to cancel the input field. This prevents the operating point of the SQUID from moving far away from the null point. In this paper, an emulator for the SQUID sensor and the feedback coil has been proposed. Magnetic coupling between the original field and the generated field by the feedback coil was emulated by electronic circuits. By using the emulator, FLL circuits can be analyzed and optimized without use of SQUID sensors. This is a useful feature, especially in the early stage of development of the MCG system when a magnetically shielded room or real SQUID sensors may not yet be available. The emulator may also be used as a test signal generator for multi-channel gain calibration and for system maintenance.
ER -