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Proceedings Paper

Detection of wood density by a diffractive-optics-based sensor
Author(s): Raimo Veil Johannes Silvennoinen; Jari Palviainen; Seppo Kellomaeki; Heli Peltola; Kari Sauvala
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Paper Abstract

Wood quality is of great importance for all of forest industry, because it affects on suitability of wood as raw material for the wood processing industry. In the future, the aim will be to use the right materials for the right end products. For this purpose we need to understand how the material properties of wood are distributed in the stem, and how the properties of wood vary from a tree to tree and from a stand in relation to the genetics, site properties and silvicultural history. Currently, detailed information is lacking how genetic, environmental and forest management influence wood properties (i.e. between and within ring variation). This is although, for example, wood density and equally percentage of latewood, which is known to reduced by faster diameter growth, i.e. larger proportion of earlywood. Wood density reflects also the amount of cell wall material, and it is considered as a key property. It also correlates to other properties of the wood like strength (important for mechanical industry) and pulp yield in terms of the quantity of chemical and mechanical pulp obtained from the volume unit. For the pulp and paper industry, the earlywood/latewood ratio is respectively of great importance, because latewood tracheids of softwoods have thick walls, which increase the density and mechanical strength of wood. On the other hand, considerably more energy is needed in defibration of latewood than earlywood.

Paper Details

Date Published: 19 July 1999
PDF: 2 pages
Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); doi: 10.1117/12.354762
Show Author Affiliations
Raimo Veil Johannes Silvennoinen, Univ. of Joensuu (Finland)
Jari Palviainen, Univ. of Joensuu (Finland)
Seppo Kellomaeki, Univ. of Joensuu (Finland)
Heli Peltola, Univ. of Joensuu (Finland)
Kari Sauvala, Finnish Forest Research Institute (Finland)

Published in SPIE Proceedings Vol. 3749:
18th Congress of the International Commission for Optics
Alexander J. Glass; Joseph W. Goodman; Milton Chang; Arthur H. Guenther; Toshimitsu Asakura, Editor(s)

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