Electromagnetic flaw detection system and method incorporating i

Details Electromagnetic flaw detection system and method incorporating i Electromagnetic flaw detection system and method incorporating i

1978-03-14

1980-03-04

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324233, 324238, 324241, G01R 3312

Patent

active

041919220

ABSTRACT:
An electromagnetic flaw detection system and method having automatic dynamic error balancing is disclosed.
The system includes means for producing an alternating electromagnetic field and for passing a metallic workpiece to be tested along a path through the field. A differential detection coil is disposed in the field near the workpiece path. The coil responds to nonuniformities in the field caused by workpiece flaws, such as voids, to produce flaw indications. Detection circuitry actuates alarm apparatus in response to the flaw indications to further indicate need for corrective action.
Automatic balancing circuitry compensates for an error signal, which the differential coil generates due to minute undesired assymmetries in the coil's mechanical structure. The balancing circuitry includes means for generating a reference signal. The reference signal is continually adjusted, in response to characteristics of the error signal, to exactly counterbalance the error signal in phase and amplitude. The coil's total output, including the error, and the adjusted reference signal, are summed at a location electrically separate from the coil to provide a flaw detection coil output in which the error is completely nulled out.

REFERENCES:
patent: 3278839 (1966-10-01), Wells et al.
patent: 3566258 (1971-02-01), Mori et al.
patent: 3701941 (1972-10-01), Bantz et al.
patent: 3763424 (1973-10-01), Bennett, Jr. et al.
patent: 3900793 (1975-08-01), Mansson
patent: 3916301 (1975-10-01), Vild et al.
patent: 4006407 (1977-02-01), Flaherty et al.

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