Eddy-current testing Totally Explained

Everything about Eddy-current Testing totally explained

Eddy-current testing uses electromagnetic induction to detect flaws in conductive materials. There are several limitations, among them: only conductive materials can be tested, the surface of the material must be accessible, the finish of the material may cause bad readings, the depth of penetration into the material is limited, and flaws that lie parallel to the probe may be undetectable. However, eddy-current testing can detect very small cracks in or near the surface of the material, the surfaces need minimal preparation, and physically complex geometries can be investigated. It is also useful for making electrical conductivity and coating thickness measurements.
   This form of testing relies on the attraction of magnetic particles to the flux leakage when an eddy current is passed through the material, this is an indication of the flaws existence, this flux leakage is caused by the flaw in the ferromagnetic material for which is being tested.
   The testing devices are portable, provide immediate feedback, and don't need to contact the item in question. Recently tomographic notion of ECT has been explored see for example:
M. Soleimani, W. R.B Lionheart, A. J. Peyton, and X. Ma, S. Higson, A 3D inverse finite element method applied to the experimental eddy current imaging data, IEEE Trans Magnetics Vol. 42, No. 5, pp. 1560-1567, May 2006.

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