Eddy current tomography for testing of ferromagnetic and non-magnetic materials

This paper presents an eddy current tomography setup with high spatial resolution and high accuracy of measurements of the signal on the detection coil. In the proposed solution both amplitude and phase shift are measured, which makes it possible to calculate the spatial distribution of both permeability and resistivity of the tested element. As a result, the setup presented here creates the possibility of effective detection of discontinuities in cylindrical elements, which opens new possibilities for industrial applications of eddy current tomography.