Eddy current metal surface flaw detector

Details Eddy current metal surface flaw detector Eddy current metal surface flaw detector

1974-06-14

1976-01-06

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3312

Patent

active

039315711

ABSTRACT:
A flaw detecting device responding to variations in eddy currents induced in a surface under test includes an oscillatory circuit comprising a tuned detector circuit including a detector coil. The detector circuit is in series with an inductor and preferably capacitors are in parallel with the detector coil and with the detector coil and inductor respectively. The oscillatory circuit includes also a two stage amplifier with zero phase shift and a capacitor between the output of the amplifier and earth. The oscillatory circuit operates to successively decrease its output amplitude when the detector is moved from free air to adjacent a flawless surface and then adjacent a flaw in the surface.

REFERENCES:
patent: 2928043 (1960-03-01), Foerster
patent: 3723861 (1973-03-01), Samples

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