Integrated SQUID-gradiometer system for magneto-cardiography without magnetic shielding

STOLZ, Ronny ; ZAKOSARENKO, V ; et al.

In: ASC-2002: Superconductors in the Marketplace, Houston, TX, USA, August 4-9, 2002 (Part I of III)IEEE transactions on applied superconductivity 13(2):356-359; Jg. 13 (2003) 2, S. 356-359

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First-order planar superconducting quantum interface device (SQUID) gradiometers were fabricated on the basis of the Nb/AlOX/Nb technology developed at IPHT Jena. The gradiometers have two pickup loops each with quadratic dimensions of 2 cm and a baseline of 4 cm, integrated on chip. The intrinsic noise corresponds to a field resolution in one loop better than 3 fT/√Hz. Because of the high gradiometer balance (> 105) the main signals masking a cardiogram are magnetic field gradients caused by nearby sources (laboratory equipment). To suppress the disturbances a second-order gradiometer was realized electronically. In addition, three washer-SQUID's arranged as a three-axis magnetometer were used to improve the disturbance suppression. All SQUID's were operated with directly coupled low-noise high-speed electronics controlled by a computer via a RS232 port. They have an input voltage noise of about 0.33 nV/Hz, a 1/f corner frequency of 0.1 Hz and bandwidth of 5 MHz. The SQUID signals were digitized using a commercially available 16-bit ADC and digitally filtered. The system shows stable operation in the laboratory without magnetic shielding. A human cardiogram could be recorded in real time with a signal-to-noise ratio better than 20. First results of the measurement of foetal cardiogram in a magnetically shielded room are discussed.

Titel:	Integrated SQUID-gradiometer system for magneto-cardiography without magnetic shielding
Autor/in / Beteiligte Person:	STOLZ, Ronny ; ZAKOSARENKO, V ; BONDARENKO, N ; SCHULZ, M ; FRITZSCH, L ; OUKHANSKI, N ; MEYER, H.-G
Link:	Volltext View record from PASCAL Archive
Quelle:	ASC-2002: Superconductors in the Marketplace, Houston, TX, USA, August 4-9, 2002 (Part I of III)IEEE transactions on applied superconductivity 13(2):356-359; Jg. 13 (2003) 2, S. 356-359
Veröffentlichung:	New York, NY: Institute of Electrical and Electronics Engineers, 2003
Medientyp:	Konferenz
Umfang:	print, 13 ref 1
ISSN:	1051-8223 (print)
Schlagwort:	Electronics Electronique Electrical engineering Electrotechnique Sciences exactes et technologie Exact sciences and technology Sciences appliquees Applied sciences Electronique des semiconducteurs. Microélectronique. Optoélectronique. Dispositifs à l'état solide Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Dispositifs supraconducteurs Superconducting devices Circuits électriques, optiques et optoélectroniques Electric, optical and optoelectronic circuits Propriétés des circuits Circuit properties Circuits électroniques Electronic circuits Convertisseurs de signal Signal convertors Electrotechnique. Electroenergetique Electrical engineering. Electrical power engineering Machines électriques Electrical machines Régulation et commande Regulation and control Matériel électrique divers Various equipment and components Divers Miscellaneous Basse vitesse Low speed Baja velocidad Blindage magnétique Magnetic shielding Champ magnétique Magnetic field Campo magnético Circuit faible bruit Low noise circuit Circuito débil ruido Commande électronique Electronic control Control electrónico Convertisseur AN AD converter Convertidor AN Dispositif supraconducteur quantique Superconducting quantum interferometer device Dispositivo supraconductor cuántico Dispositif supraconducteur Superconductor device Dispositivo supraconductor Ecran magnétique Magnetic screen Pantalla magnética Ecran électromagnétique Electromagnetic shielding Pantalla electromagnética Equipement informatique Computer equipment Equipo informático Equipement laboratoire Laboratory equipment Equipo laboratorio Grande vitesse High speed Gran velocidad Magnétomètre Magnetometers Magnetómetro Masquage Masking Enmascaramiento Méthode gradient Gradient method Método gradiente Ordre 1 First order Orden 1 Puce électronique Chip Pulga electrónica Signal horaire Time signal Señal horaria Système intégré Integrated system Sistema integrado Technologie planaire Planar technology Tecnología planar Foetal MCG MCG SQUID electronics SQUID's gradiometers magneto-cardiogram
Sonstiges:	Nachgewiesen in: PASCAL Archive Sprachen: English Original Material: INIST-CNRS Document Type: Conference Paper File Description: text Language: English Author Affiliations: Quantum Electronics Department, Institute for Physical High Technology, Jena 07745, Germany Rights: Copyright 2004 INIST-CNRS ; CC BY 4.0 ; Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS Notes: Electrical engineering. Electroenergetics ; Electronics

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