Apparatus for characterizing conductivity of materials by measur

Details Apparatus for characterizing conductivity of materials by measur Apparatus for characterizing conductivity of materials by measur

1989-03-14

1991-05-14

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324654, 505843, G01N 2772, G01R 3312, G01R 33035, G01C 2108

Patent

active

050159526

ABSTRACT:
Apparatus and method for noncontact, radio-frequency shielding current characterization of materials. Self- or mutual inductance changes in one or more inductive elements, respectively, occur when materials capable of supporting shielding currents are placed in proximity thereto, or undergo change in resistivity while in place. Such changes can be observed by incorporating the inductor(s) in a resonant circuit and determining the frequency of oscillation or by measuring the voltage induced on a coupled inductive element. The present invention is useful for determining the critical temperature and superconducting transition width for superconducting samples.

REFERENCES:
patent: 3036267 (1962-05-01), Semelman
patent: 3477018 (1969-11-01), Richardson et al.
patent: 4000458 (1976-12-01), Miller et al.
Lyneis et al., "Measurement of the Microwave Properties of Superconducting N6.sub.30 -Ta.sub.70 ", IEEE Transactions on Magnetics, vol. Mag-13, No. 1, Jan. 1977, pp. 339-342.

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