Method and arrangement for measuring wood

Details Method and arrangement for measuring wood Method and arrangement for measuring wood

G - Physics

01

N

G01N 21/85 (2006.01) G01N 21/84 (2006.01) G01N 21/898 (2006.01) G01N 33/46 (2006.01)

Patent

CA 2346120

The invention relates to a method and arrangement for measuring the quality of wood. of wood. The wood comprises not only a pure body but also components of bark and knots, having optical properties different from those of the pure body. Barked trees (308) are turned into a wood powder (322). The wood powder (322) is illuminated with optical radiation and the radiation is received by means of a camera (330). The camera (330) transmits a signal consistent with the radiation refelected from or passed through the wood powder (322) to a computer (332) which, by means of the optical properties of the wood powder (322), determines the amount of bark, knots, and/or defective wood present in the wood.

Cette invention a trait à un procédé d'évaluation de la qualité du bois et à l'appareil correspondant. L'arbre n'est pas uniquement constitué du bois parfait mais aussi d'écorce et il comporte également des noeuds, les caractéristiques optiques de ces deux derniers composants étant différentes de celles du bois parfait. Les arbres écorcés (308) sont transformés en sciure de bois (322). Celle-ci est éclairée par un rayonnement optique et le rayonnement est reçu par un appareil de prises de vue (330). Celui-ci envoie à un ordinateur (332) un signal correspondant au rayonnement réfléchi par la sciure de bois (322) ou la traversant. L'ordinateur, d'après les caractéristiques optiques de la sciure de bois, détermine les quantités d'écorce, de noeuds et/ou d'imperfections qui se trouvent dans cette sciure.

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