Eddy current gauge for monitoring displacement using printed circuit coil

Patent · Sat Jan 01 00:00:00 EST 1977

OSTI ID:862902

Visioli, Jr., Armando J. ^[1]

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1. (Dover, NJ)

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.

• DOE Contract Number: AT(40-1)-3685
• 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

Related Subjects

eddy
current
gauge
monitoring
displacement
printed
circuit
coil
proximity
detection
non-contact
measurement
static
dynamic
metallic
conductive
surfaces
provided
obtained
change
impedance
flat
spiral-wound
excited
constant
frequency
source
detected
corresponding
voltage
related
losses
distant
material
target
arrangement
provides
considerable
linear
range
increased
accuracies
stability
sensitivity
entire
conductive surfaces
linear displacement
constant current
arrangement provides
eddy current
conductive material
printed circuit
frequency source
corresponding change
proximity detection
entire range
conductive surface
/324/