Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1992-02-07
1993-06-08
Snow, Walter E.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324228, 324262, 505726, G01R 3312, G01N 2772
Patent
active
052182967
ABSTRACT:
Disclosed are apparatus and method for measuring a characteristic of a film comprised of a material that is a superconductor below a critical temperature. The apparatus includes a magnetic circuit for inducing an alternating magnetic flux at a localized region of a surface of the film. The circuit includes a magnetic core (42) having a gap (44) made therein and a drive winding (46) coupled thereto. A current source (50) is coupled to the drive winding for passing an alternating current therethrough for inducing an alternating magnetic flux within the gap. Measurement circuitry (54, 56) is responsive to a current induced within the film by an entry of the magnetic flux into the film. A processor (60) is coupled to the measurement circuitry and determines a critical current density of the superconducting film within the localized region. The measurement circuitry includes a sense winding (48) that is coupled to the core and detects a magnitude of an electrical signal induced in the sense winding by the alternating magnetic flux.
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"Magnetization and Meissner Effect in the High T.sub.c Superconductor Ba.sub.x Y.sub.1-x CuO.sub.3 O.sub.3-y ", Electrotechnical Laboratory, by M. Tokumoto et al., Mar. 1987.
Shinde Subhash L.
Worthington Thomas K.
International Business Machines - Corporation
Snow Walter E.
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