Eddy current gauge for monitoring displacement using printed cir

Details Eddy current gauge for monitoring displacement using printed cir Eddy current gauge for monitoring displacement using printed cir

1976-04-29

1977-08-16

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 40, G01R 3312

Patent

active

040428761

ABSTRACT:
A proximity detection system for non-contact displacement and proximity measurement of static or dynamic metallic or conductive surfaces is provided wherein the measurement is obtained by monitoring the change in impedance of a flat, generally spiral-wound, printed circuit coil which is excited by a constant current, constant frequency source. The change in impedance, which is detected as a corresponding change in voltage across the coil, is related to the eddy current losses in the distant conductive material target. The arrangement provides for considerable linear displacement range with increased accuracies, stability, and sensitivity over the entire range.

REFERENCES:
patent: 2747152 (1956-05-01), Greene
patent: 3444460 (1969-05-01), Penney, Jr.
Smith et al; Ostimization of Eddy Current Measurements of Coil to Conductor Spacing; Nat. Exal; Dec. 1975; pp. 279-283 & 292.

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