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Demodulation of Spatial Carrier Images: Performance Analysis of Several Algorithms Using a Single Image |
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| Authors: | C Badulescu M Bornert J-C Dupré S Equis M Grédiac J Molimard P Picart R Rotinat V Valle |
| Institution: | 1. LBMS, EA 4325, ENIB-ENSTA-UBO, Brest, France 2. Laboratoire Navier, UMR 8205, CNRS-école des Ponts ParisTech, Champs-sur-Marne, France 3. Institut P’, UPR 3346, CNRS-Université de Poitiers-ENSMA, Futuroscope Chasseneuil, France 4. EPFL, Nanophotonics and Metrology Laboratory, Lausanne, Switzerland 5. Institut Pascal, UMR 6602, Université Blaise Pascal-CNRS, Clermont-Ferrand, France 6. LGF, UMR 5307, Ecole Nationale Supérieure des Mines, CIS-EMSE, CNRS, Saint-Etienne, France 7. LAUM, UMR 6613, CNRS-Université du Maine, Le Mans, France 8. MSMP Laboratory, Arts et Métiers ParisTech, Chalons-en-Champagne, France |
| Abstract: | 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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