Electricity: measuring and testing – Magnetic – Displacement
Patent
1988-12-30
1989-10-17
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Displacement
324227, 324236, G01B 714, G01N 2790
Patent
active
048750077
ABSTRACT:
A proximity detection system having two eddy current probes, one a measurement and the other a reference probe. In one embodiment, one probe is energized by a high frequency AC signal and the other by a DC signal. The energizing signals are periodically switched between the two probes and the difference between responses of the probes when AC energized is detected. The difference eliminates drift and variations in the probe outputs from environmental effects like temperature, one of the probes measures the proximity of a selected material, and the other probe is set-up with a target of the same material at a constant distance, as a reference. The DC constant current signal which alternately energizes each probe when not energized by the AC signal, prevents each probe from being dead when not energized by the AC signal. The probes are operated in a resonant mode to increase both the system linearity and sensitivity to target position.
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Edmonds Warren S.
Eisenzopf Reinhard J.
The Indikon Company, Inc.
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