Standard depth of penetration formula

There is always a magic number: 30 microns. In other words: Is your technology able to detect defects of 30 microns depth? This is not a scientific post but technical based on some scientific aspects, conventions, and finally the experience. This decrease follows a curve similar to the image. This is because electrons have less resistance to free movements on the surface that is called the skin effect. So this is the limit for everybody that we can consider the phenomenon of eddy current enough relevant.

The calculator converts theoretical values based on the formular above. We do not vouch for its correctness and applicability to specific conditions. Similar to 4PP, the eddy current method is also able to determine the resistivity if thickness of the specimen is larger than the penetration depth of the induced currents. The key difference is that the penetration depth of the currents is much smaller than with 4PP setups even if one would use very small tip distances. The penetration depth, meaning the analyzing area for resistivity measurement depends on several factors.

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