Skip to content
Licensed Unlicensed Requires Authentication Published by De Gruyter February 28, 2008

A survey of moisture distribution in two sets of Scots pine logs by NIR-spectroscopy

  • Kyösti Karttunen , Asta Leinonen and Matti-Paavo Sarén
From the journal Holzforschung


Moisture content distributions of Scots pine logs in the green state were measured by a novel multi-step procedure. After sample preparation, the transverse sections of the wood surfaces were scanned by an automated scanning device with a fiber optical probe connected to a Fourier transform near-infrared spectroscope. In the course of the measurement sequences, several issues were addressed, such as surface drying, measurement geometry, ease of automation and interconnected data handling. The near-infrared (NIR) data were first modeled separately for heartwood and sapwood by means of multivariate partial least squares regression. The models for moisture content were evaluated by root mean square error of prediction, the result being 0.8% for heartwood and 10% for sapwood. The two models were then applied to the NIR data collected from sets of disks cut from nine logs. The results of the calculated moisture contents were evaluated by methods of descriptive statistics, and they indicated clear differences and trends in the distribution of moisture content in transverse or longitudinal regions of a log. Additionally, inter-tree variation in moisture content was detected.

Corresponding author. Measurement and Sensor Laboratory, University of Oulu, Technology Park 127, 87400 Kajaani, Finland

Received: 2007-3-7
Accepted: 2008-1-10
Published Online: 2008-02-28
Published Online: 2008-02-28
Published in Print: 2008-07-01

©2008 by Walter de Gruyter Berlin New York

Downloaded on 7.12.2023 from
Scroll to top button