Eddy current gauge for monitoring displacement using printed circuit coil

Patent · 01 January 1977

OSTI ID:862902

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.

• Assignee: United States of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 4042876
• OSTI ID: 862902
• Country of Publication: United States
• Language: English

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source
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static
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target
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