Finite element modeling (FEM) simulation of interactions between wood and microwaves |
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Authors: | Lars Hansson Nils Lundgren Anna-Lena Antti Olle Hagman |
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Institution: | 1. Division of Wood Physics, Lule? University of Technology, Skellefte? Campus, Skellefte? SE-931 87, Sweden 2. Division of Wood Technology, Lule? University of Technology, Skellefte? Campus, Skellefte?, SE-931 87, Sweden
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Abstract: | The aim of this study was to use finite element modeling (FEM) as a tool to analyze microwave scattering in wood and to verify
the model by measurements with a microwave scanner. A medical computed tomography scanner was used to measure distribution
of density and moisture content in a piece of Scots pine (Pinus sylvestris). Dielectric properties were calculated from measured values for cross sections from the piece and used in the model. Images
describing the distribution of the electric field and phase shift were obtained from the FEM simulation. The model was verified
by measurements with a scanner based on a microwave sensor. The results show that simulated values correspond well to measured
values. Furthermore, discontinuities in the material caused scattering in both the measured and the simulated values. The
greater the discontinuity in the material, the greater was the need for computational power in the simulation. |
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Keywords: | Microwave scanning Wood Dielectric properties Modulated scattering technique Finite element modeling |
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