Method for measuring the resistive transition and critical curre

Details Method for measuring the resistive transition and critical curre Method for measuring the resistive transition and critical curre

1990-10-31

1993-06-29

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324 716, 505 1, 505843, H01B 1200, G01N 2700, G01R 2726

Patent

active

052237982

ABSTRACT:
The present invention provides a method for measuring the intragranular and ntergranular critical current of a granular superconductive material, comprising the steps of: 1) conducting a substantially rectangular electronic pulse through the material so as to conduct a current through the material such that when the intergranular critical current of the material is exceeded, any grains present in the material remain in a superconducting state when the current level is below the intragranular critical current; 2) measuring the current through the material while conducting the pulse; 3) measuring a voltage difference across the material while conducting the pulse; 4) determining the intergranular critical current through the material by discerning a non-zero voltage difference across the material and contemporaneously measuring the current; and 5) determining the intragranular critical current through the material by varying the current to discern a current level at which the electrical resistance of the material increases to that of the non-superconducting state as the grains of the material transition from the superconducting to a non-superconducting state. This method may also be used to determine the critical current of a homogeneous superconductive material.

REFERENCES:
patent: 3390330 (1968-06-01), Meyerhoff et al.
patent: 3428891 (1969-02-01), Purcell et al.
patent: 3469184 (1969-09-01), Lambe et al.
patent: 4777437 (1988-10-01), Tashiro et al.
patent: 4873482 (1989-10-01), Gray
patent: 4947118 (1990-08-01), Fujimaki et al.

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