Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1991-06-12
1993-11-02
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324718, 324715, 324262, 324225, G01N 2787, G01N 2790
Patent
active
052587088
ABSTRACT:
In a non-destructive method for the detection of surface cracks in metals, an eddy current is induced in the surface region of a workpiece under test, at a frequency sufficiently high to generate an alternating magnetic field solely in the skin region of the workpiece. That alternating surface magnetic field is interrogated by means of a relatively small electro-magnetic induction sensor, having regard to the overall area of the induced magnetic field. The sensor provides a voltage output which is analysed, preferably in real time, to yield an indication sensor. Also described is a probe for performing such a method.
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Mirshekar-Syahkal Dariush
Sadeghi Seyed H. H.
Edmonds Warren S.
Strecker Gerard R.
University of Essex
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