Influence of wood anatomy on fiber orientation measurement obtained by laser scanning on five European species
TypeArticles dans des revues avec comité de lecture
Abstract In order to obtain high production rates of sawn timber, the sawmilling industry can use laser scanning, allowing knot detection and machine strength grading. In particular, laser scanners measure grain angle using the so-called tracheid effect on wood surface where an elliptic scattering of the laser light can be observed. This paper aims to describe the light scattering obtained by a laser beam projection on wood surface and to assess the accuracy of such fiber orientation measurement on five European species. Firstly, fiber orientation measurement error was assessed by rotating samples. Secondly, the description of the scattering effect was done considering ellipse axis ratios and areas. This was studied according to several parameters such as wood surface machining, moisture content, and orthotropic planes of symmetry. Fiber orientation measurement was successfully performed on all the tested species. The measurement error was below 1.6°, except for oak longitudinal–radial (LR) plane showing an error up to 3.1°. For most of the species, the error was higher in LR plane because of the influence of medullary rays. Despite the observation of major variabilities in laser light scattering, it was possible to measure the grain angles with a good accuracy for all investigated species.
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BESSEAU, Benoît; POT, Guillaume; COLLET, Robert; VIGUIER, Joffrey (2019)Scanner measurements allow knot detection and machine strength grading on sawn timber, which answers the construction and sawmilling industry needs at high production rates. In particular, laser scanners measure fiber ...
Assessment of the error of fiber orientation measurement obtained by laser scanning on several European hardwood and softwood species BESSEAU, Benoît; POT, Guillaume; VIGUIER, Joffrey; COLLET, Robert (CompWood 2019 Conference, 2019)Scanner measurements allow knot detection and machine strength grading on sawn timber. In particular, laser scanners measure fiber orientation by means of the so-called tracheid effect explained by the fact that the wood ...
VIGUIER, Joffrey; JEHL, Arnaud; COLLET, Robert; BLERON, Laurent; MERIAUDEAU, Fabrice (Taylor & Francis, 2015)Timber strength grading has become a major issue in the European Union during the last years, due to the introduction of the Eurocode 5 and all its related standards. Currently, the most performing strength ...
An innovative method based on grain angle measurement to sort veneer and predict mechanical properties of beech laminated veneer lumber VIGUIER, Joffrey; BOURGEAY, Christophe; ROHUMAA, Anti; POT, Guillaume; DENAUD, Louis (Elsevier, 2018)This study proposes an innovative model based on local grain angle measurements to predict the modulus of elasticity of LVL made from beech. It includes a veneers sorting method industrially compatible thanks to its low ...
Modelling mechanical properties of spruce and Douglas fir timber by means of X-ray and grain angle measurements for strength grading purpose VIGUIER, Joffrey; BOURREAU, Damien; BOCQUET, Jean-François; POT, Guillaume; BLERON, Laurent; LANVIN, Jean-Denis (Springer, 2017)This study proposes a model using data from a scanner (X-ray and grain angle measurements) to perform strength grading. The research also includes global measurements of modulus of elasticity (obtained by vibrations and ...