ESPSIElectronic Speckle Pattern Shearing Interferometry
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In contrast to the first two methods, ESPSI provides an in-situ capability but at a price--currently--of reduced detail in characterization of the delamination front's features.
Even without a detailed analysis of its shape, which is impossible with the only available in-situ technique, ESPSI, it is clear that it is not a straight line, parallel to a position of the fillet (see Fig.