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

Patent · Mon Dec 31 23:00:00 EST 1990

OSTI ID:867819

Doss, James D ^[1]

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1. Los Alamos, NM

Apparatus and method for noncontact, radio-frequency shielding current characterization of materials. 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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM
• DOE Contract Number: W-7405-ENG-36
• Assignee: University of California (Alameda, CA)
• Patent Number(s): US 5015952
• OSTI ID: 867819
• Country of Publication: United States
• Language: English

Related Subjects

/324/505/
apparatus
capable
change
changes
characterization
characterizing
characterizing conductivity
circuit
conductivity
coupled
coupled inductive
critical
critical temperature
current
current characterization
currents
currents therein
determining
effect
element
elements
frequency
incorporating
induced
inductance
inductance changes
inductive
inductive element
inductive elements
inductor
materials
materials capable
measuring
method
mutual
mutual inductance
noncontact
observed
occur
oscillation
placed
proximity
radio-frequency
radio-frequency shielding
resistivity
resonant
resonant circuit
respectively
samples
self-
shielding
shielding current
shielding currents
superconducting
superconducting sample
superconducting transition
supporting
temperature
therein
thereto
transition
undergo
useful
voltage
voltage induced
width