Reconstruction of rectangular tight cracks separated by a ligament from eddy current impedance change data

TL;DRAbstract

In eddy-current impedance change scans, the signals from nearby lying cracks may not be resolved. The presence of one or more cracks can be made visible by using a deconvolution approach. This knowledge is used in an iterative inversion scheme to retrieve the dimensions (length, depth) of each crack. Reconstructions are shown based on computer generated data for an air core pancake coil over a metallic half-space. We also looked at the influence of an artificially added lift-off distortion. For the iterative inversion scheme, the speed and accuracy of the forward model calculations are of utmost importance. To test the inversion principle, we used the volume integral method. To speed up the forward model calculations, we used a neural network forward model. The minimization of the cost function was done using a simplex search algorithm.

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