Method and apparatus for examining a workpiece
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United States of America Patent
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Feb 17, 1987
Grant Date -
N/A
app pub date -
Feb 25, 1985
filing date -
Feb 25, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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