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Metal Working

Eddy-current-gauge-for-monitoring-displacement-using-printed-circuit-coil

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Eddy current gauge for monitoring displacement using printed circuit coil

Details

Inventors: Visioli, Jr., Armando J.;
Assignee: The United States of America as represented by the United States Energy (Washington, DC)
Primary Examiner: Corcoran; Robert J.
Assistant Examiner:
Attorney, Agent or Firm: Carlson; Dean E., Hamel; Stephen D., Breeden; David E.

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.

DETAILED DESCRIPTION This invention was evolved with the object of providing an improved eddy current type displacement measuring system to obtain improved accuracy, stability, sensitivity, and range.
Further, it is an object of this invention to provide an eddy current type displacement measuring system as set forth in the above object which is easily and economically manufactured with consistent reproducibility.
Yet another object of this invention is to provide an eddy current type displacement measuring system with an improved proximity probe in which the sensing coil may be reproduceably manufactured by standard printed circuit techniques.
Other objects and many of the attendant advantages of the present invention will be obvious from the following detailed description taken in conjunction with the accompanying drawings.

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