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Digital processing techniques are increasingly being applied to perform quantitative analysis of interferograms. In this paper the maps of phase derivatives are extracted by direct manipulation of phase-shifted interferograms. The advantages of this process are: (i) no need for prior phase evaluation or unwrapping procedures; (ii) a decrease in processing time; (iii) easy retrieval of the absolute phase map. A general description of the method is presented and discussed. The proposed technique is applied to the study of the deformation of a test object by the manipulation of four phase-shifted interferograms.

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Authors: FACCHINI M, JRC Ispra (IT);ZANETTA P, JRC Ispra (IT)
Bibliographic Reference: Article: Applied Optics, Vol. 34 (1995) pp. 1-5
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