0000000000597324
AUTHOR
Tadeus Sliwa
Digital Correlation Method Based on Microgeometrical Texture Patterns for Strain Fields Measurements
International audience; Digital correlation method is widely used in experimental mechanics to obtain the deformation field. Currently this method is applied with digital images of the initial and deformed surface sprayed with black or white painting. Speckle patterns are then captured and the correlation can be made with high 0.01 pixel accuracy in 2D-cases. In three-dimensions, the stereo-correlation can be used with a lower accuracy. The work presented in this paper, is a first approach based on the use of a 3D laser scanner in the objective of three-dimensional strain field measurement. The digital speckle patterns are not given by gray level but from the micro-geometrical surface textu…
3D Full Field Measurement Based on Micro-geometrical Texture Patterns
International audience; The work presented is based on the laser scanning device that is now currently used in the reverse engineering or tri-dimensionnal inspection domains. The interest of this technique is to measure directly the point clouds in 3D coordinates. That permits to reduce the approximations due to the different correlations made in grey level images stereo-correlation. The sensor is mounted on a CMM that moves it and gives it a good orientation in the measurement space.The pattern is determined by the natural or artificially created micro-geometry (roughness) of the surface product. A depth image is obtained after filtering of the shape of the object. This filtering can be ca…