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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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
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Engineering Sciences
Mechanics
Optics
Photonic
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creator Daval, Vincent
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Belkacemi, Mohamed
Meriaudeau, Fabrice
Collet, Robert
description 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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Photonic
title Automatic measurement of wood fiber orientation and knot detection using an optical system based on heating conduction
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