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Detection of Pith Location of Norway Spruce Timber Boards on the Basis of Optical Scanning
Linnaeus University, Faculty of Technology, Department of Building Technology.ORCID iD: 0000-0002-0872-0251
Linnaeus University, Faculty of Technology, Department of Building Technology.ORCID iD: 0000-0002-6410-1017
Linnaeus University, Faculty of Technology, Department of Building Technology.ORCID iD: 0000-0002-8513-0394
2019 (English)In: Proceedings, 21st international nondestructive testing and evaluation of wood symposium: Freiburg, Germany / [ed] Xiping Wang; Udo H. Sauter; Robert J. Ross, Madison, U.S.A: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory , 2019, p. 268-275Conference paper, Published paper (Refereed)
Abstract [en]

Optical scanners are used in the woodworking industry to detect various defects, such as dead and live knots, cracks, and fibre distortions, which are important for the visual appearance grading of wood. Data from scanning is also used to assess mechanical properties such as bending and tensile strength, for the purpose of machine strength grading of sawn timbers. Knowledge of annular ring width and location of pith in relation to board cross-sections, and how these properties vary in the longitudinal direction of boards, is relevant for many purposes, such as assessment of shape stability and mechanical properties of timber. Therefore, the purpose of the present research is to evaluate possibilities to determine annular ring width and location of pith on the basis of scanning of surfaces parallel to the longitudinal board direction. The first step of this novel method is to identify clear wood sections, free of defects along boards. Then time-frequency analysis is applied to assess the variation of light intensity over surfaces of these sections, such that local wavelengths, related to the annular ring width patterns are detected on all four surfaces around the board. Finally, the location of pith is calculated by comparing annular ring width distributions on the different surfaces, and assuming that annular rings are concentric circles with the pith in the centre. Results indicate that optical scanners and the suggested method allow for accurate detection of annular ring width and location of pith along boards.

Place, publisher, year, edition, pages
Madison, U.S.A: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory , 2019. p. 268-275
Series
General Technical Report ; FPL-GTR-272
Keywords [en]
pith location, annual ring width, continuous wavelet transform
National Category
Building Technologies Wood Science
Research subject
Technology (byts ev till Engineering); Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-89385OAI: oai:DiVA.org:lnu-89385DiVA, id: diva2:1357004
Conference
21st International Nondestructive Testing and Evaluation of Wood Symposium, Freiburg, Germany, September 24-27, 2019
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-17Bibliographically approved

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Habite, TadiosOlsson, AndersOscarsson, Jan

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