Skip to main content

Advertisement

Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Finite element modeling (FEM) simulation of interactions between wood and microwaves

Article metrics

  • 242 Accesses

  • 12 Citations

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.

References

  1. 1.

    Johansson J, Hagman O, Fjellner BA (2003) Predicting moisture content and density distribution of Scots pine by microwave scanning of sawn timber. J Wood Sci 49:312–316

  2. 2.

    Antti L (1999) Heating and drying wood using microwave power. Doctoral Thesis, Luleå University of Technology

  3. 3.

    Perre P, Turner IW (1997) Microwave drying of softwood in an oversized waveguide: theory and experiment. AIChE J 43:2579–2595

  4. 4.

    Zhao H, Turner IW (2000) Use of a coupled computational model for studying the microwave heating of wood. Appl Math Model 24:183–197

  5. 5.

    Lindgren O (1992) Medical CT-scanners for non-destructive wood density and moisture content measurements. Doctoral Thesis, Luleå University of Technology

  6. 6.

    Comsol AB (2005) Comsol home page. http://www.comsol.se Cited 31 Oct 2005

  7. 7.

    Torgovnikov GI (1993) Dielectric properties of wood and wood-based materials. Springer, Berlin Heidelberg New York

  8. 8.

    Jin J (2002) The finite element method in electromagnetics. Wiley, New York

  9. 9.

    Sorzano COS, Thévenaz P, Unser M (2005) Elastic registration of biological images using vector-spline regularization. IEEE Trans Biomed Eng 52:652–663

  10. 10.

    Johansson J (2001) Property predictions of wood using micro-waves. Licentiate Thesis, Luleå University of Technology

  11. 11.

    Satimo France (2005) Satimo home page. http://www.satimo.com Cited 31 Oct 2005

  12. 12.

    Bolomey JC, Gardiol FE (2001) Engineering applications of the modulated scatterer technique. Artech House, Boston

Download references

Author information

Correspondence to Nils Lundgren.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Hansson, L., Lundgren, N., Antti, A. et al. Finite element modeling (FEM) simulation of interactions between wood and microwaves. J Wood Sci 52, 406–410 (2006) doi:10.1007/s10086-005-0794-8

Download citation

Key words

  • Microwave scanning
  • Wood
  • Dielectric properties
  • Modulated scattering technique
  • Finite element modeling