Method and apparatus for examining a workpiece

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

G - Physics

01

N

324/50

G01N 27/90 (2006.01)

Patent

CA 1238685

Method and Apparatus for Examining a Workpiece 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 work- piece surface.

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