Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object
Abstract
The type of conductor, its property, and if a metal, its type and cross-sectional area can be obtained from measurements made at different frequencies for the amount of unbalance created in a previously balanced stable coil detection system. The true resistive component is accurately measured and thus reflects only the voltage loss attributable to eddy currents caused by introduction of the test sample to the coil system. This voltage divided by corresponding applied frequency gives a curve which peaks at a frequency dependent upon type of conductor. For a metal this peak frequency is proportional to the samples resistivity divided by its cross-sectional area.
- Inventors:
-
- Vienna, VA
- McLean, VA
- Falls Church, VA
- Arlington, VA
- Issue Date:
- Research Org.:
- Georgetown Univ., Washington, D.C. (USA)
- OSTI Identifier:
- 863867
- Patent Number(s):
- 4263551
- Assignee:
- Georgetown University (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS
- DOE Contract Number:
- AT(40-1)-3665
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- method; apparatus; identifying; conductive; monitoring; true; resistive; component; impedance; change; coil; caused; type; conductor; property; metal; cross-sectional; obtained; measurements; frequencies; amount; unbalance; created; previously; balanced; stable; detection; accurately; measured; reflects; voltage; loss; attributable; eddy; currents; introduction; sample; divided; corresponding; applied; frequency; curve; peaks; dependent; peak; proportional; samples; resistivity; eddy current; eddy currents; resistive component; accurately measure; accurately measured; impedance change; /324/
Citation Formats
Gregory, William D, Capots, Larry H, George, James P, and Janik, Richard. Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object. United States: N. p., 1981.
Web.
Gregory, William D, Capots, Larry H, George, James P, & Janik, Richard. Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object. United States.
Gregory, William D, Capots, Larry H, George, James P, and Janik, Richard. Thu .
"Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object". United States. https://www.osti.gov/servlets/purl/863867.
@article{osti_863867,
title = {Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object},
author = {Gregory, William D and Capots, Larry H and George, James P and Janik, Richard},
abstractNote = {The type of conductor, its property, and if a metal, its type and cross-sectional area can be obtained from measurements made at different frequencies for the amount of unbalance created in a previously balanced stable coil detection system. The true resistive component is accurately measured and thus reflects only the voltage loss attributable to eddy currents caused by introduction of the test sample to the coil system. This voltage divided by corresponding applied frequency gives a curve which peaks at a frequency dependent upon type of conductor. For a metal this peak frequency is proportional to the samples resistivity divided by its cross-sectional area.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1981},
month = {Thu Jan 01 00:00:00 EST 1981}
}
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