Derivatives of displacement obtained by direct manipulation of phase-shifted interferograms.
The maps of phase derivatives are extracted here by direct manipulation of phase-shifted interferograms. There are three main advantages: There is no need for prior phase evaluation or unwrapping procedures, and only a short processing time is needed. By digital integration of the derivatives the absolute phase map can also be retrieved without unwrapping procedures. A general description of the method is presented and discussed. For example, the proposed technique has been applied to the study of the deformation of a test object by the manipulation of four phase-shifted interferograms.
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Facchini
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Zanetta