Demodulation of Spatial Carrier Images: Performance Analysis of Several Algorithms Using a Single Image
TypeArticles dans des revues avec comité de lecture
Optical full-field techniques have a great importance in modern experimental mechanics. Even if they are reasonably spread among the university laboratories, their diffusion in industrial companies remains very narrow for several reasons, especially a lack of metrological performance assessment. A full-field measurement can be characterized by its resolution, bias, measuring range, and by a specific quantity, the spatial resolution. The present paper proposes an original procedure to estimate in one single step the resolution, bias and spatial resolution for a given operator (decoding algorithms such as image correlation, low-pass filters, derivation tools ...). This procedure is based on the construction of a particular multi-frequential field, and a Bode diagram representation of the results. This analysis is applied to various phase demodulating algorithms suited to estimate in-plane displacements.
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PETIT, J; CASTELNAU, Olivier; BORNERT, Michel; ZHANG, F. G.; HOFMANN, F; KORSUNSKY, A. M; FAURIE, D; LE BOURLOT, C; MICHA, Jean-Sébastien; ROBACH, O; ULRICH, O (CrossMark, 2015)A better understanding of the effective mechanical behavior of polycrystalline materials requires an accurate knowledge of the behavior at a scale smaller than the grain size. The X-ray Laue microdiffraction technique ...