Eddy current flaw detection apparatus employing a resonance circ

Details Eddy current flaw detection apparatus employing a resonance circ Eddy current flaw detection apparatus employing a resonance circ

1991-07-03

1992-09-08

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324237, 324238, G01N 2782, G01R 3312

Patent

active

051461641

ABSTRACT:
An eddy current flaw detection apparatus, having: a pair of detecting coils disposed in a separated manner along a transit path of a conductor and coaxial with the conductor, magnetic fields generated by said detecting coils being in anti-phase; an alternating current bridge circuit, two sides of a bridge of which are comprising the detecting coils, and which, when a relative change occurs in inductances of the detecting coils and equilibrium of the bridge is thus disturbed, outputs an abnormality detection signal; a pair of resonance coils, which are disposed between the detecting coils, and coaxial with the detecting coils, and magnetic fields of which are in phase, and which are so set that in a state in which the bridge is in equilibrium, induction currents generated by said resonance coils cancel each other out; and a capacity circuit for the purpose of bringing oscillation frequencies of the detecting coils into resonance, which is connected to the resonance coils.

REFERENCES:
patent: 4107605 (1978-08-01), Hudgell
Patent Abstracts of Japan, vol. 11, No. 156 (P-578)(2603), May 21, 1987, JP-A-61-292548, (Mitsubishi Metal Corp.), Dec. 23, 1986.

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