Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1996-12-27
1999-03-09
Nguyen, Vinh P.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
G01R 33035
Patent
active
058805834
ABSTRACT:
A cryogenic current comparator device is based on the magnetic shielding properties of superconducting tubes and maintains electrical currents being compared in a highly exact integer ratio. One pair of superconducting tubes are arranged adjacent to each other so that the longitudinal axis of each tube are parallel. A coil of current carrying wire is formed by winding the wire down through a longitudinal bore of the first tube and then back up the longitudinal bore of the second tube to form at least one turn or loop of the coil. A second, identical pair of superconducting tubes is placed adjacent and longitudinally parallel to the first pair of tubes so that a superconducting quantum interference device magnetometer is surrounded by the four tubes in order to measure a magnetic field induced by the current traveling through the coils. The device operates at a temperature of 77 degrees K. and is used to predict the relative uncertainty of a wide range of resistance and current ratio measurements to approximately one part in one hundred million.
REFERENCES:
patent: 5666052 (1997-09-01), Sata
Harvey, I.K., A Precise Low Temperature dc Ratio Transformer; Review of Sntific Instruments; vol. 43, pp. 1626-1629 (1972) Oct. 1972.
Elmquist et al, "A High-Temperature Superconductor CCC", 1994 Conference on Precision Electromagnetic Measurements Digest, pp. 136-137, (Unavail Month).
Elmquist et al, "High-Temperature Superconductor CCC", IEEE, vol. 44, No. 2, pp. 262-264, Apr. 1995.
Heikki Seppa, "The Ratio Error of the Overlapped-Tube CCC", IEEE, vol. 39, No. 5 , pp. 689-697, Oct. 1990.
Peter Gutmann, "A Comparation of the CCC and the Josephson Potentiometer in Resistance Bridges Using Their Figures of Merit", IEEE, vol. 42, No. 2, pp. 385-390, Apr. 1993.
Dziuba Ronald F.
Elmquist Randolph E.
Nguyen Vinh P.
The United States of America as represented by the Secretary of
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