Improved current type proximity detector

Patent · Thu Apr 29 00:00:00 EDT 1976

OSTI ID:7256731

Visioli, Jr, A J

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 spiralwound, 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 th 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: Energy Research and Development Administration
• OSTI ID: 7256731
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
DISPLACEMENT GAGES
DESIGN
ACCURACY
EDDY CURRENTS
ELECTRIC COILS
ELECTRIC IMPEDANCE
PRINTED CIRCUITS
SENSITIVITY
STABILITY
CURRENTS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
IMPEDANCE
MEASURING INSTRUMENTS
440300* - Miscellaneous Instruments- (-1989)