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of material discontinuities, for applications to defect or damage detection in real structures. The topological technique or synthetic focusing method are examples of used imaging methods. All these methods
are due to the FA process, which introduces two types of imperfections: defects (whose presence cannot be controlled) and singularities (whose presence can be controlled by appropriate adjustment
. At the part level Skin Model The Skin model is a theoretical surface model of non-ideal geometry. It encompasses all the possible defects of a workpiece. The ISO TC 213 adopted Ballu and Mathieu’s work [1
of the mechanisms. The geometric and dimensional specifications represent the limits of the manufacturing defects of a given surface. Tolerance specification is not an easy task because (i) the assigned tolerance