Application of data processing to eddy current measurements variable geometry and virtual displacement probes

Simulation of probe track and shape permits matching probe to defects, based on a single initial acquisition. Certain rules must be observed for correct simulation. Examples are given of differential and double-differential simulation; adequate and poor matching of probe to defect are illustrated. Track simulation is of interest in cases where the direction of probe motion is determined by the acquisition process. Enhanced interpretation capabilities are provided by digital filtering of signals