Method and apparatus for the detection of anomalies in rotating

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

1981-08-14

1984-11-06

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

G01N 2782

Patent

active

044814712

ABSTRACT:
A detector operable to detect cracks in a rotating 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.

REFERENCES:
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patent: 4146837 (1979-03-01), Bashkirov
patent: 4352065 (1982-09-01), Rogachev et al.

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