Accession Number : ADD016517

Title :   Method for Determining the Granular Nature of Superconductors Using Pulsed Current.

Descriptive Note : Patent, Filed 28 Jan 93, patented 16 Aug 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Jones, Thomas E ; McGinnis, Wayne C

Report Date : 16 Aug 1994

Pagination or Media Count : 11

Abstract : The present invention provides a method for determining the granular nature of superconductive materials and devices which includes the steps of: conducting a substantially rectangular current pulse through the superconductive material, maintaining the temperature of the superconductive material at a substantially constant temperature which does not exceed the critical temperature of the superconductive material; determining the amplitude of the current pulse; determining the electrical resistance, R, of the superconductive material resulting from conducting current pulse through the superconductive material; increasing the current until the electrical resistance of the superconductive material becomes saturated; determining the electrical resistance difference, Sigma, between the electrical resistance, R, of the saturated superconductive material and a total normal state electrical resistance of the superconductive material.

Descriptors :   *PATENTS, *SUPERCONDUCTORS, AMPLITUDE, CRITICAL TEMPERATURE, ELECTRICAL RESISTANCE, PULSES, GRANULAR MATERIALS, ELECTRIC CURRENT

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE