DC-SQUID sensor system for multichannel neuromagnetometry

Various DC SQUID sensor configurations were developed for use in a 19-channel neuromagnetometer. Apart from the standard type, resistively and inductively shunted SQUIDs were made, allowing for a large screening factor beta (>1). In this way, signal coupling from the pickup coil to the SQUID is f...

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Veröffentlicht in:	IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) 1991-03, Vol.27 (2), p.2955-2958
Hauptverfasser:	Houwman, E.P., Veldhuis, D., Flokstra, J., ter Brake, H.J.M., Jaszczuk, W., Martinez, A., Rogalla, H.
Format:	Artikel
Sprache:	eng
Schlagworte:	550600 > Medicine Applied sciences Circuit noise Coils CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY COUPLING Coupling circuits DESIGN DIAGNOSTIC USES ELECTRONIC EQUIPMENT Electronics Exact sciences and technology FLUXMETERS Inductance Magnetic field measurement Magnetic noise MAGNETOMETERS MEASURING INSTRUMENTS MICROWAVE EQUIPMENT MULTI-CHANNEL ANALYZERS NERVOUS SYSTEM PULSE ANALYZERS RADIOLOGY AND NUCLEAR MEDICINE Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Sensor systems SIGNAL-TO-NOISE RATIO SQUID DEVICES SQUIDs Stripline SUPERCONDUCTING COILS SUPERCONDUCTING DEVICES USES 665412 > Superconducting Devices-- (1992-) Voltage
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Beschreibung
Zusammenfassung:	Various DC SQUID sensor configurations were developed for use in a 19-channel neuromagnetometer. Apart from the standard type, resistively and inductively shunted SQUIDs were made, allowing for a large screening factor beta (>1). In this way, signal coupling from the pickup coil to the SQUID is facilitated and can be decreased. The number of turns of the input coil is decreased further by allowing for an inductance mismatch in the input circuit. Although theoretically both measures give rise to an increased field noise of the sensor, they may lead to a reduction of the excess noise and the noise balance may become positive.
ISSN:	0018-9464 1941-0069
DOI:	10.1109/20.133830