Digital eddy current apparatus for sensing and analyzing metallu

Details Digital eddy current apparatus for sensing and analyzing metallu Digital eddy current apparatus for sensing and analyzing metallu

1976-06-03

1977-11-22

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

G01R 3312

Patent

active

040597954

ABSTRACT:
A digital eddy current apparatus for sensing and analyzing metallurgical characteristics of an electrically conductive material. A square wave is supplied to a resonating circuit which includes a coil used as a sensing element for the conductive material. The resonating circuit produces a sinusoidal wave which is converted into a rectangular pulse which, when the resonating means is at resonance condition if superimposed upon the square wave pulse it would be positioned in the center of one-half of the square wave. The width of the rectangular pulse is a direct function of the amplitude of the sinusoidal wave and phase shift of the sinusoidal waveform is detected by movement of the rectangular pulse from the center position within the square wave. The width and position of the rectangular pulse is a direct function of the metallurgical characteristics of the conductive material.

REFERENCES:
patent: 3314006 (1967-04-01), Hentschel
patent: 3391336 (1968-07-01), Hentschel
patent: 3416071 (1968-12-01), Wiers

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