Method of digital processing of deformed surface interferograms for estimating Poisson’s ratio

Keywords

surface interferogram, speckle interferogram, Poisson’s ratio, image proces¬sing, segmentation, Retinex.

Cite as

Ivasenko I. B., Berehulyak O. R., Vorobel R. A., Voronyak T. I., and Stasyshyn I. V. Method of digital processing of deformed surface interferograms for estimating Poisson’s ratio. Physicochemical Mechanics of Materials. 2025. 61(6), 099-103.

https://doi.org/10.15407/pcmm2025.06.099

Abstract

An automated method for estimating the Poisson’s ratio using interferograms and speckle interferograms of the material surface by means of digital image processing was developed. Preliminary image processing based on a parameterized retinex was performed to equalize the background in preparation for further segmentation. Image segmentation was carried out using a threshold level, that maximizes the dispersion between two classes. The Poisson coefficient was estimated based on the angle between the asymptotes of the hyperbolas of interference fringes obtained by averaging the edge points of the segmentation results. The method was tested on interferograms of the steel beam surface, obtained under different loads. The application of the method to difference electronic speckle pattern interferogram of the beam surface made of aluminum alloy is demonstrated. The results of experimental studies demonstrate the advantages of the proposed method.

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