Digital correlation of grainy shadow images for surface profile measurement |
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Authors: | Jean Brillaud Fabienne Lagattu |
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Affiliation: | aLaboratoire de Mécanique et de Physique des Matériaux, E.N.S.M.A, BP40109, 86961 Futuroscope, France |
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Abstract: | An optical method, combining the projection of a structured light pattern with the digital correlation technique, is discussed in this paper. This method allows measurement of full-field profile on object surface of about 20 mm square size. Tests on a rotated plane surface have been performed in order to quantify the method capabilities. It is shown that this technique leads to an accuracy of about 1 μm for a spatial resolution of around half a millimeter. Profile measurements of a micro-engraved object and at the crack tip of a polymer sample are also presented. Results give proof that this technique remains efficient even in presence of important height slope. |
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Keywords: | Image correlation Profile Grainy pattern |
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