Accession Number:

ADD015829

Title:

Method for Measuring the Resistive Transition and Critical Current in Superconductors using Pulsed Current.

Descriptive Note:

Patent, Filed 31 Oct 90, patented 29 Jun 93,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1993-06-29

Pagination or Media Count:

10.0

Abstract:

The present invention provides a method for measuring the intragranular and intergranular 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 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

Subject Categories:

  • Electricity and Magnetism
  • Laminates and Composite Materials
  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE