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

Patent · Tue May 14 00:00:00 EDT 1991

OSTI ID:7027157

Doss, J D

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.

• DOE Contract Number: W-7405-ENG-36
• Assignee: University of California, Alameda, CA (United States)
• Patent Number(s): A; US 5015952
• Application Number: PPN: US 7-324264
• OSTI ID: 7027157
• Country of Publication: United States
• Language: English

Related Subjects

440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
CURRENTS
DESIGN
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUIPMENT
MEASURING INSTRUMENTS
MEASURING METHODS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE