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Title: Apparatus for characterizing conductivity of materials by measuring the effect of induced shielding currents therein

Abstract

Apparatus and method for noncontact, radio-frequency shielding current characterization of materials is disclosed. 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. 10 figures.

Inventors:
Issue Date:
OSTI Identifier:
7027157
Patent Number(s):
5015952 A
Application Number:
PPN: US 7-324264
Assignee:
University of California, Alameda, CA (United States)
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Patent File Date: 14 Mar 1989
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; ELECTRIC MEASURING INSTRUMENTS; DESIGN; SUPERCONDUCTORS; ELECTRIC CONDUCTIVITY; TRANSITION TEMPERATURE; ELECTRIC CURRENTS; MEASURING METHODS; CURRENTS; ELECTRICAL EQUIPMENT; ELECTRICAL PROPERTIES; EQUIPMENT; MEASURING INSTRUMENTS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; 440800* - Miscellaneous Instrumentation- (1990-)

Citation Formats

Doss, J D. Apparatus for characterizing conductivity of materials by measuring the effect of induced shielding currents therein. United States: N. p., 1991. Web.
Doss, J D. Apparatus for characterizing conductivity of materials by measuring the effect of induced shielding currents therein. United States.
Doss, J D. Tue . "Apparatus for characterizing conductivity of materials by measuring the effect of induced shielding currents therein". United States.
@article{osti_7027157,
title = {Apparatus for characterizing conductivity of materials by measuring the effect of induced shielding currents therein},
author = {Doss, J D},
abstractNote = {Apparatus and method for noncontact, radio-frequency shielding current characterization of materials is disclosed. 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. 10 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {5}
}