Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Measuring or testing system or device
Patent
1995-02-21
1998-06-16
Snow, Walter E.
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
Measuring or testing system or device
324248, 505846, H01L 3900, G01R 33035
Patent
active
057670439
ABSTRACT:
A low-noise directly coupled dc SQUID magnetometer is disclosed. The magnetometer provides for single layer fabrication and is particularly applicable to high-T.sub.c superconductors operating at 77 Kelvin. A pair of dc SQUIDs are connected and biased in series such that the output voltage modulation with applied flux of the dual SQUID magnetometer, is double that of a single SQUID magnetometer. The bias current is applied to one SQUID and removed from the second SQUID of the pair. The magnetometer pick-up coil is directly coupled to the SQUID pair, providing for coherent modulation of the series-connected SQUIDS and a reduction of flux density noise of the device by a factor of 1/.sqroot.2.
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Clarke, J., "SQUIDS: Theory and Practice", New Superconductivity Electronics, Kluwer Academic Publishers (1993) pp. 123-180.
Miklich, A.H., et al., "Bicrystal YBCO Dc SQUIDs With Low Noise", IEEE Transactions of Applied Superconductivity (1993) 3:(1)2434-2437.
Koelle, D. et al., "DC SQUID magnetometers from single layers of YBa.sub.2 Cu.sub.3 O.sub.7-x ", Applied Phisics Letters (1993) 63:(16)2271-2273.
Zhang, Y., et al., "Sensitive rf-SQUIDs and Magnetometers Operating at 77 K", IEEE Transactions on Applied Superconductivity (1993) 3:(1)2465-2468.
Burns Michael J.
Cantor Robin H.
Conductus, Inc.
Snow Walter E.
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