Technique for Measuring Position Dependent Electrical Resistivity

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Abstract
An eddy current method is given for determining electrical resistivity as a function of distance beneath the surface of a cylindrical metal core within a coil. The method is also useful for studying surface phenomena such as the anomalous skin effect, and provides a relative measure of bulk resistivity values on short, thick samples with an accuracy of at least 0.05%. Bulk resistivity values for copper, obtained by this method, agree with known values. An example is presented in which the resistivity data shows that working the surface layers of a high purity copper sample led to an imperfection density 25 times higher at the surface than it was 160 μ beneath the surface.

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