Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1978-01-20
1981-04-21
Rolinec, Rudolph V.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
G01R 3312
Patent
active
042635519
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.
REFERENCES:
patent: 3619771 (1971-11-01), Hentschel
patent: 3686564 (1972-08-01), Mallick, Jr. et al.
patent: 3758849 (1973-09-01), Susman et al.
patent: 3763424 (1973-10-01), Bennett, Jr. et al.
New Proximity Device Detects Metallurgical Differences; Automation; Sep. 1968, p. 11.
Capots Larry H.
George James P.
Gregory William D.
Janik Richard
Byrne John J.
Georgetown University
Rolinec Rudolph V.
Snow Walter E.
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