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Detection of the effective refractive index of thermally modified Scots pine by immersion liquid method |
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| Authors: | Ilpo Niskanen Jorma Heikkinen Jukka Mikkonen Anni Harju Henrik Heräjärvi Martti Venäläinen Kai-Erik Peiponen |
| Institution: | (1) Thule Institute, University of Oulu, PO Box 7300, 90014 Oulu, Finland;(2) Measurement and Sensor Laboratory, Research and Development Centre of Kajaani, University of Oulu, Technology Park 127, 87400 Kajaani, Finland;(3) Finnish Forest Research Institute, Punkaharju Unit, Finlandiantie 18, 58450 Punkaharju, Finland;(4) Finnish Forest Research Institute, Joensuu Unit, Yliopistokatu 6, 80101 Joensuu, Finland;(5) Department of Physics and Mathematics, University of Eastern Finland, PO Box 111, 80101 Joensuu, Finland |
| Abstract: | The purpose of this study was to determine the effective refractive index of thermally modified Scots pine (Pinus sylvestris L.) wood specimens as a quantitative measure regarding the change of wood density which is due to the thermal modification. The refractive index of thermally modified Scots pine wood was obtained by introducing pine wood powder into an immersion liquid and measuring light backscattering with a homebuilt multifunction spectrophotometer. The present method provides useful information that in principle can be applied, for example, in the optimization of the thermal modification process and inspection of the quality of thermally modified wood. |
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