Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Superconductors
Patent
1991-03-15
1992-07-28
Wieder, Kenneth A.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Superconductors
324654, 324655, 324248, 505843, G01N 2700
Patent
active
051343606
ABSTRACT:
An apparatus for the measurement of the critical current of a superconductive sample, e.g., a clad superconductive sample, the apparatus including a conductive coil, a means for maintaining the coil in proximity to a superconductive sample, an electrical connection means for passing a low amplitude alternating current through the coil, a cooling means for maintaining the superconductive sample at a preselected temperature, a means for passing a current through the superconductive sample, and, a means for monitoring reactance of the coil, is disclosed, together with a process of measuring the critical current of a superconductive material, e.g., a clad superconductive material, by placing a superconductive material into the vicinity of the conductive coil of such an apparatus, cooling the superconductive material to a preselected temperature, passing a low amplitude alternating current through the coil, the alternating current capable of generating a magnetic field sufficient to penetrate, e.g., any cladding, and to induce eddy currents in the superconductive material, passing a steadily increasing current through the superconductive material, the current characterized as having a different frequency than the alternating current, and, monitoring the reactance of the coil with a phase sensitive detector as the current passed through the superconductive material is steadily increased whereby critical current of the superconductive material can be observed as the point whereat a component of impedance deviates.
REFERENCES:
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patent: 4904929 (1990-02-01), Bohandy et al.
patent: 5015952 (1991-05-01), Doss
patent: 5039944 (1991-08-01), Kim et al.
patent: 5059891 (1991-10-01), Bohandy et al.
patent: 5065087 (1991-11-01), Kita et al.
Dye Robert C.
Martin Joe A.
Brown Glenn W.
Cottrell Bruce H.
Gaetjens Paul D.
Moser William R.
The United States of America as represented by the United States
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