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Exploitation de la texture d'images de speckle pour caractériser, de façon globale, l'état de surface des chaussées à l'échelle de microtexture

Abstract : The improvement of skid resistance of pavements requires some means of characterization of the surface condition on the aggregate scale (macrotexture) and of their polish (microtexture). However, to date, the microtexture, more particularly height variations from one up to about ten micrometers in amplitude, cannot be correctly apprehended by means implemented in civil engineering (owing to the limitation of the measuring range of profilometers at the required resolution). The research works carried out come within the general framework of works of the LCPC intended to reach a better understanding of the contribution of microtexture to tire/road friction. They aim at the development of a global characterization method of microtexture by using the speckle techniques, more particularly in the case of an unresolved subjective speckle. In view of the lack of information available regarding the application of speckle techniques to multi-scale surfaces, some simulations of the speckle contrast are carried out using the scalar diffraction theory of Kirchhoff in case of a two-scale surface texture and for the selected particular experimental configuration. They demonstrate the possibility to characterize by the chosen method, the coarseness of the microtexture or any changes with wear. In the second time, the first-order statistics of speckle (contrast, histogram of intensity) are examined within the framework of experiments carried out with some reference surfaces (abrasive papers with different kinds of coarseness) and some models of pavement surfaces (various rocks, various steps of wear), all samples being calibrated by recording some profiles. By means of adapted treatments of the speckle images, we achieve to discriminate the reference surfaces and in the case of the models of pavement surfaces, two different kinds of coarseness and two different steps of wear.
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https://tel.archives-ouvertes.fr/tel-00003899
Contributor : Catherine Hun <>
Submitted on : Thursday, December 4, 2003 - 4:21:44 PM
Last modification on : Thursday, December 4, 2003 - 4:21:44 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:14:34 PM

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Catherine Hun. Exploitation de la texture d'images de speckle pour caractériser, de façon globale, l'état de surface des chaussées à l'échelle de microtexture. Sciences de l'ingénieur [physics]. Université Louis Pasteur - Strasbourg I, 2002. Français. ⟨tel-00003899⟩

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