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An online microwave scanner for sawn wood
Luleå tekniska universitet.
2007 (English)Report (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet/LTU Skellefteå/Träteknologi , 2007.
Series
Teknisk rapport / Luleå tekniska universitet
Keyword [en]
wood microwave scanning moisture content density
Identifiers
URN: urn:nbn:se:umu:diva-46083OAI: oai:DiVA.org:umu-46083DiVA: diva2:436948
Available from: 2011-08-25 Created: 2011-08-25 Last updated: 2011-09-08
In thesis
1. Microwave sensors for scanning of sawn timber
Open this publication in new window or tab >>Microwave sensors for scanning of sawn timber
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A microwave imaging sensor that measures the signal transmitted through a board was investigated with respect to the ability to predict the distribution of moisture and density in sawn lumber. Furthermore, the response from the sensor was related to strength properties of the boards. Multivariate statistics was used to relate the measured variables to various properties. A finite element model based on X-ray computed tomography images was developed to describe the interactions between microwaves and wood. The model made it possible to simulate the response from the sensor under varying conditions.

The results show that microwaves can be used for prediction of density and moisture content. They can also be used for prediction of strength properties, mainly from the correlation to density, but also from the influence on microwaves of structural variations in the wood. The finite element model is useful in the evaluation of microwave sensors for wood, drying equipment or other applications where electromagnetic waves interact with wood.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2007. 40 p.
Series
Doctoral thesis / Luleå University of Technology, 2007:9
Keyword
microwave scanning; wood; density; moisture content; strength grading; finite element
National Category
Control Engineering
Identifiers
urn:nbn:se:umu:diva-46102 (URN)1402-1544 (ISBN)
Public defence
2007-04-18, Hörsal A, Forskargatan 1, Skellefteå, 10:00 (English)
Opponent
Supervisors
Available from: 2011-08-29 Created: 2011-08-26 Last updated: 2011-08-29Bibliographically approved

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Lundgren, Nils

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf