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The interference of a white light speckle pattern, obtained by reflection from a rough surface, with a reference beam was investigated. A theoretical analysis has been developed to derive the expression of the speckle contrast, observed in the image plane of a telescopic system, as a function of all the parameters of the interference device. A numerical evaluation of the contrast dependence on the optical path difference is presented, as well as its experimental verification. On the basis of these results on the speckle contrast properties a method has been developed for 3-dimensional profilometry of relatively large optically rough objects, using real time digital image processing.

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Authors: LULLI A, JRC Ispra (IT);ZANETTA P, JRC Ispra (IT);LUCIA A C, JRC Ispra (IT);CASAGRANDE F, Università degli Studi di Milano, Dipartimento diFisica (IT)
Bibliographic Reference: Article : Optics Communications (1995)
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