Predicting moisture content and density distribution of Scots pine by microwave scanning of sawn timber II: evaluation of models generated on a pixel level |
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| Authors: | Nils Lundgren Olle Hagman Jan Johansson |
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| Institution: | 1. Division of Wood Technology, Lule? University of Technology, Skellefte? Campus, Skellefte?, SE-931 87, Sweden
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| Abstract: | The purpose of this study was to use images from a microwave sensor on a pixel level for simultaneous prediction of moisture
content and density of wood. The microwave sensor functions as a line-scan camera with a pixel size of 8mm. Boards of Scots
pine (Pinus sylvestris), 25 and 50mm thick, were scanned at three different moisture contents. Dry density and moisture content for each pixel were
calculated from measurements with a computed tomography scanner. It was possible to create models for prediction of density
on a pixel level. Models for prediction of moisture content had to be based on average values over homogeneous regions. Accuracy
will be improved if it is possible to make a classification of knots, heartwood, sapwood, etc., and calibrate different models
for different types of wood. The limitations of the sensor used are high noise in amplitude measurements and the restriction
to one period for phase measurements. |
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| Keywords: | Microwave scanning Wood Density Moisture content |
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