Method and apparatus for examining a workpiece

Details Method and apparatus for examining a workpiece Method and apparatus for examining a workpiece

1985-02-25

1987-02-17

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324228, G01N 2782

Patent

active

046442715

ABSTRACT:
An eddy current inspector for imaging of a workpiece shape. A differentially wound test coil mounted next to a workpiece path of travel is energized with a time varying signal to set up eddy currents in the workpiece. A field modifying sleeve is rotated with the field to periodically disrupt the eddy current inducing field. Two signals from the coil, a flaw signal and a shape signal, are time multiplexed and scaled to present a real time image of a workpiece surface as well as the orientation and severity of flaws existing at the workpiece surface.

REFERENCES:
patent: 2938162 (1960-05-01), Roffman et al.
patent: 2998566 (1961-08-01), Cochran
patent: 3056081 (1962-09-01), Hochschild
patent: 3110860 (1963-10-01), Allen
patent: 3152302 (1964-10-01), Allen et al.
patent: 3419797 (1968-12-01), Libby
patent: 4203069 (1980-05-01), Davis
patent: 4337431 (1982-06-01), Hale

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