Published October 7, 2021 | Version v1
Journal article Open

Feasibility of portable NIR spectrometer for quality assurance in glue-laminated timber production

  • 1. Andrej Marušič Institute, University of Primorska; InnoRenew CoE
  • 2. ETH Zürich; Bern University of Applied Sciences; Division of Wood Science and Engineering, Luleå University of Technology
  • 3. Department of Wood and Wood-Based Materials, Saxon University of Cooperative Education
  • 4. Bern University of Applied Sciences; Department of Wood and Wood-Based Materials, Saxon University of Cooperative Education
  • 5. InnoRenew CoE; Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska


The feasibility of a portable NIR sensor for off-line determination of diverse wood quality aspects relevant in the production of glue-laminated timber was demonstrated. The best performance was noticed for assessing wood moisture content, with a lower capacity to estimate wood density and mechanical properties. NIR spectroscopy was modestly capable of predicting surface roughness. However, the traceability of the raw resources and the automatic classification of diverse wood defects were successfully demonstrated. The developed chemometric model could predict the total delamination and detailed delamination length. Finally, recommendations regarding further system development were provided with the aim of implementation and integration of the NIR measurement into glue-laminated timber production plants.


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InnoRenew CoE – Renewable materials and healthy environments research and innovation centre of excellence 739574
European Commission