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PLS models for predicting wood properties from microwave measurements based on three dimensional FEM simulations
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-5869-2236
2007 (English)In: Proceedings from the Nordic Workshop in Wood Engineering / [ed] Helena Johnsson, Luleå: Luleå tekniska universitet, 2007Conference paper, Published paper (Other academic)
Abstract [en]

When electromagnetic waves propagate through wood they will be affected by variations in the dielectric properties. These variations are related to different properties within the wood. Dielectric properties of wood depend on moisture content, density, temperature, grain angle and frequency of the electromagnetic wave. The aim with this study was to use threedimensional finite element modelling (FEM) in combination with multivariate statistics and projection to latent structures (PLS) to develop a prediction model for moisture content and dry basis density in wood. An X-ray computed tomography (CT) scanner was used to detect density and, with that, moisture content in wood. Dielectric properties were calculated within a wood volume and used in the simulation. Different frequencies and directions of the electric field were simulated. Previous studies have shown that this method gives a good description of the interactions between wood and microwaves in two dimensions. The results show that 3D finite element modelling can be used to generate a prediction model for moisture content from microwave scanning. Other properties of wood such as density and grain angle have less influence on the microwaves but might be predicted by further processing of the signal.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2007.
Series
Research report / Luleå University of Technology, ISSN 1402-1528 ; 2007:06
National Category
Other Mechanical Engineering Bio Materials
Research subject
Wood Technology; Wood Physics
Identifiers
URN: urn:nbn:se:ltu:diva-32796Local ID: 765b7e80-d3c4-11db-b6e3-000ea68e967bOAI: oai:DiVA.org:ltu-32796DiVA: diva2:1006030
Conference
Nordic Workshop in Wood Engineering : 21/02/2007 - 21/02/2007
Note
Godkänd; 2007; 20070316 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-02-22Bibliographically approved

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