Eddy current depth penetration ferrous metals


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Eddy current

Under certain assumptions uniform material, uniform magnetic field, no skin effect , etc. The technique is very sensitive to detect and size pits. A different, albeit physically closely related challenge is the detection of deeply lying flaws and inhomogeneities in electrically conducting solid materials. This is the eddy current. In contrast, at the trailing edge right side , the clockwise current causes a magnetic field pointed down, in the same direction as the magnet's field, creating an attractive force between the sheet and the trailing edge of the magnet. Using electromagnets with electronic switching comparable to electronic speed control it is possible to generate electromagnetic fields moving in an arbitrary direction.
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Eddy current - Wikipedia

The strength of the eddy currents, and thus the retardation, depends on the conductivity of the coin's metal. This effect limits the flux linkage in inductors and transformers having magnetic cores. From Wikipedia, the free encyclopedia. A recent technique, referred to as Lorentz force eddy current testing LET , [11] [12] exploits the advantages of applying DC magnetic fields and relative motion providing deep and relatively fast testing of electrically conducting materials. A conductive object will experience a repulsion force.
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Eddy-current testing

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Description: See the diagram at right. Variations in the electrical conductivity and magnetic permeability of the test object, and the presence of defects causes a change in eddy current and a corresponding change in phase and amplitude that can be detected by measuring the impedance changes in the coil, which is a telltale sign of the presence of defects. The same technique is used in electromagnetic brakes in railroad cars and to quickly stop the blades in power tools such as circular saws. In the traditional version of eddy current testing an alternating AC magnetic field is used to induce eddy currents inside the material to be investigated.

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