Abstract
Using rotating magnetic fields, defects at depths of up to 30 mm in samples of aluminium plates have been mapped by eddy current inspection. The currents diverted by the defect were visualized on a grid of points (area ) without requiring post-processing of adjacent data points. For a cylindrical void, an estimate of the depth was given by evaluating the eddy current response at 15 frequencies from 14 to 400 Hz. So far, the vertical resolution is of the order of 10 mm for depths from 10 to 25 mm. Although still insufficient in vertical resolution, the method meets the basic requirements for three-dimensional mapping of defects by `current projections' in a generalized sense of tomography. Improvements of the vertical resolution seem to be possible using efficient inversion algorithms.
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