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Automatic measurement of wood fiber orientation and knot detection using an optical system based on heating conduction

Type
Articles dans des revues avec comité de lecture
Author
DAVAL, Vincent
127742 Laboratoire Bourguignon des Matériaux et Procédés [LaBoMaP]
POT, Guillaume
127742 Laboratoire Bourguignon des Matériaux et Procédés [LaBoMaP]
BELKACEMI, Mohamed
22594 Laboratoire Electronique, Informatique et Image [UMR6303] [Le2i]
MERIAUDEAU, Fabrice
22594 Laboratoire Electronique, Informatique et Image [UMR6303] [Le2i]
COLLET, Robert
127742 Laboratoire Bourguignon des Matériaux et Procédés [LaBoMaP]

URI
http://hdl.handle.net/10985/10534
Date
2015
Journal
Optics Express

Abstract

In this paper, a new approach to computing the deviation of wood grain is proposed. To do this, the thermal conduction properties of timber are used (higher conduction in the fiber direction). Exciting the surface of the wood with a laser and capturing the thermal conduction using a thermal camera, an ellipse can be observed. Using a method similar to the tracheid effect, it is possible to extract information from this ellipse, such as the slope of grain and the presence of knots. With this method it is therefore possible to extend the mechanical model (assessing the mechanical properties of timber) to take certain singularities into account. Using this approach, the slope of grain can be estimated for any wood species, either hardwood or softwood, which was not possible with the existing tracheid effect.

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