YBa2Cu3O7 thin film SQUID gradiometer for biomagnetic measurements

Low-noise rf SQUID washers fabricated from YBa2Cu3O7 epitaxial thin films have been used to construct a first-order electronic gradiometer operating at 77 K and suitable for biomagnetic measurements. Mechanical adjustment of the two-SQUID gradiometric setup made it possible to attenuate signals due...

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Veröffentlicht in:	Applied physics letters 1993-04, Vol.62 (15), p.1824-1826
Hauptverfasser:	TAVRIN, Y, ZHANG, Y, MÜCK, M, BRAGINSKI, A. I, HEIDEN, C
Format:	Artikel
Sprache:	eng
Schlagworte:	Biological and medical sciences Biothermics. Biomagnetism. Bioelectricity Exact sciences and technology Fundamental and applied biological sciences. Psychology Instruments, apparatus, components and techniques common to several branches of physics and astronomy Magnetic components, instruments and techniques Physics Tissues, organs and organisms biophysics
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Zusammenfassung:	Low-noise rf SQUID washers fabricated from YBa2Cu3O7 epitaxial thin films have been used to construct a first-order electronic gradiometer operating at 77 K and suitable for biomagnetic measurements. Mechanical adjustment of the two-SQUID gradiometric setup made it possible to attenuate signals due to far magnetic field sources by three orders of magnitude. A magnetic field resolution of ≤280 fT/Hz1/2 above 2 Hz was attained through the use of large flux focusers. The fine structure of human heart magnetocardiograms was recorded in unshielded space. In a shielded room, magnetoencephalograms were obtained. The system was used to obtain new data on auditory evoked cortical response.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.109561