Lift off compensation of eddy current crack detection system by

Details Lift off compensation of eddy current crack detection system by Lift off compensation of eddy current crack detection system by

1984-09-13

1986-09-02

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324237, 331 65, 331109, G01N 2772, G01N 2782, G01R 3312

Patent

active

046098704

ABSTRACT:
An eddy current crack detection system has an inductive probe coil forming part of an oscillatory circuit. The coil voltage is fed to a measuring device a change in amplitude of the coil voltage being used as an indication of a crack. In order to compensate for lift-off in the amplitude of the coil voltage, a control signal is generated related to the magnitude of lift-off, and controls the value of a variable damping resistor in the oscillatory circuit.

REFERENCES:
patent: 3396193 (1968-02-01), Nordahl
patent: 4274054 (1981-06-01), Savidge et al.
patent: 4387338 (1983-06-01), Hecht et al.

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