Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1982-03-02
1984-04-24
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324232, 324262, G01R 3312, G01N 2782
Patent
active
044450893
ABSTRACT:
Apparatus for the detection of cracks or other defects near the surface of a conducting engineering material of interest includes a magnetic probe having two sites which in operation act as magnetic poles on the same side of the probe such that an external magnetic field extends between them principally in a region adjacent to that one side of the probe, means for rotating the probe about an axis spaced from the mid-point between the two sites, whereby when the probe is adjacent to the surface of an engineering material of interest occupying the region with the axis substantially perpendicular to the surface the magnetic field is able to penetrate the surface and rotate beneath it about the axis causing energy associated with the magnetic field to be dissipated in the material, and means for detecting a change caused by a defect in the material, to the dissipated energy.
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Strecker Gerard R.
The Secretary of State for Defence in Her Britannic Majesty's Go
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