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A method for under bark detection of the wood grain angle radial dependence
Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.ORCID iD: 0000-0002-7018-6248
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
2007 (English)In: Wood Material Science and Engineering, ISSN 1748-0272, Vol. 2, no 3,4, p. 118-129Article in journal (Refereed) Published
Abstract [en]

Twist in wood, being closely related to spiral grain, may cause

serious problems in building structures, furniture, and joinery. It is therefore of great interest to sort out, at an early stage in the manufacturing process, trees, logs and boards that have an access of spiral grain. The spiral grain pattern is described by a helical deviation of the fibre direction in relation to the longitudinal direction of a living tree or a log and seems to be an indicator for other defects such as compression wood. Remote microwave sensing of spiral grain has received a large interest during the latest two decades. Its development has been impeded by the large variation with moisture content of the microwave properties of wood and by the complexity in modelling the electromagnetic field in a log with spiral grain. A review is presented of a direct method with no requirement of information on moisture content for boards. This procedure has recently been generalized to cylindrical logs and trees having a constant slope of the grain. A further generalization is presented here to allow for the normal spiral grain pattern with radially changing slope of grain in wood under bark. Based on this theory, a measurement procedure is proposed for the detection of wood grain angle with radial dependence, requiring no information on moisture content in the sapwood, also applicable for completely or partially frozen wood. A suitable application would be an instrument to use in the forest for measurements on living trees or logs.

Place, publisher, year, edition, pages
Taylor & Francis , 2007. Vol. 2, no 3,4, p. 118-129
Keyword [en]
in field, living tree, log, measurement
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Wood Science
Research subject
Physics, Electrotechnology; Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:vxu:diva-3240OAI: oai:DiVA.org:vxu-3240DiVA, id: diva2:203196
Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2017-01-10Bibliographically approved

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Nilsson, BörjeSjödén, ThereseNordebo, SvenSäll, Harald

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