Method and apparatus for the detection of anomalies in...

Details Method and apparatus for the detection of anomalies in... Method and apparatus for the detection of anomalies in...

G - Physics

01

N

324/50

G01N 27/90 (2006.01)

Patent

CA 1193665

ABSTRACT OF THE DISCLOSURE A detector operable to detect cracks in a rotat- ing member generates an alternating eddy current in the rotating member with an external coil surrounding the rotating member. A pick-up coil senses changes in the magnetic field of the eddy current due to a crack. The frequency of the excitation current is very much lower than the frequency of rotation of the rotating member and a plurality of samples are taken for each degree location. The output signal of the pick-up coil is comprised of both the crack indicative component and a residual or induced magnetism component. The signal is processed so as to extract the desired crack indicative component.

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