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

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,...

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Bibliographic Details
Published in:Optics express 2015-12, Vol.23 (26), p.33529-33539
Main Authors: Daval, Vincent, Pot, Guillaume, Belkacemi, Mohamed, Meriaudeau, Fabrice, Collet, Robert
Format: Article
Language:English
Subjects:
Engineering Sciences
Mechanics
Optics
Photonic
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.23.033529