Title :
Planar HTS gradiometers with large baseline
Author :
Zhang, Y. ; Soltner, H. ; Krause, H.-J. ; Sodtke, E. ; Zander, W. ; Schubert, J. ; Gruneklee, M. ; Lomparski, D. ; Banzet, M. ; Bousack, H. ; Braginski, A.I.
Author_Institution :
Inst. fur Schicht- und Ionentech., Forschungszentrum Julich GmbH, Germany
fDate :
6/1/1997 12:00:00 AM
Abstract :
We have designed an HTS single-layer planar rf double-hole gradiometer with long and well defined baseline up to 5 mm and small washer areas. We measured a gradient field resolution of about 1 pT/(cm/spl middot//spl radic/Hz) above 10 Hz in an unshielded environment. The gradiometer could be operated placed on a swinging pendulum in the geomagnetic field. This permitted a simple demonstration of a movable SQUID system. We placed a SQUID system on a scanning table and performed two-dimensional eddy-current nondestructive evaluation measurements on realistic samples.
Keywords :
SQUID magnetometers; barium compounds; eddy current testing; flaw detection; high-temperature superconductors; superconducting device noise; yttrium compounds; 1 to 10 Hz; 5 mm; HTS single-layer planar rf double-hole gradiometer; LaAlO/sub 3/; LaAlO/sub 3/ substrate; YBa/sub 2/Cu/sub 3/O/sub 7/; YBaCuO; geomagnetic field; gradient field resolution; large baseline; long well-defined baseline; movable SQUID system; scanning table; small washer area; swinging pendulum; two-dimensional eddy-current nondestructive evaluation measurements; unshielded environment; Coils; High temperature superconductors; Inductance; Intersymbol interference; Josephson junctions; Magnetic field measurement; Pulsed laser deposition; SQUID magnetometers; Spatial resolution; Substrates;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
