Eddy current flaw detector having rotatable field defining...

Details Eddy current flaw detector having rotatable field defining... Eddy current flaw detector having rotatable field defining...

G - Physics

01

N

324/50, 340/124.

G01N 27/90 (2006.01) B21B 38/00 (2006.01)

Patent

CA 1243745

Eddy Current Flaw Detector Having Rotatable Field Defining Sleeve Abstract Method and apparatus for scanning a generally cy- lindrical workpiece for flaws. A cylindrical metallic sleeve is rotatably supported about a workpiece path of travel. Two differentially wound energization coils surround the sleeve near two apertures in the sleeve. The coils are energized with a high frequency signal that induces eddy currents in the workpiece. The aper- tures periodically disrupt the eddy current inducing magnetic fields and enhances signals from the coils indicative of the presence of flaws in the workpiece.

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