Recent analytical eddy current models, which correctly account for each of the electromagnetic coupling effects arising in inductive circuits that contain a conducting and even ferromagnetic sample, have been used to develop algorithms for the simultaneous evaluation of material parameters. In particular, the electrical conductivity and magnetic permeability of different material and thickness tubes have been extracted from single transient eddy current signals. Simple Laplace and Fourier transform rules are used to generate an arbitrary number of independent equations relating experimental data and theory. These equations are simultaneously solved to determine the material parameters of interest. Furthermore, results computed from these equations can be tabulated and implemented in a lookup-table scheme for an ultra-fast multi-parameter characterization of material properties.
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