Abstract
The research aimed to test the hypothesis that near infrared reflectance (NIR) scans could detect surface characteristics associated with uneven coloring before staining red alder (Alnus rubra Bong), cherry (Prunus sp.), pine (Pinus sp.) and maple (Acer sp.) boards. NIR spectra were successfully correlated with average scanned area data of grain angle, density, pre- and post-staining 8-bit color values, and the difference in color induced by staining when combinations of either three, two or one of the tested wood species were used as input parameters. Difficulties were encountered when both cherry and maple were clustered together with the other two species in a generalized model, however, when both were excluded, the model produced very high R2 values (over 0.98).
Zusammenfassung
Ziel dieser Studie war es, die Hypothese zu überprüfen, dass mittels NIR-Messungen bereits vor der Verfärbung Oberflächenmerkmale von Brettern aus Roterlen- (Alnus rubra Bong), Kirsch- (Prunus sp.), Kiefern- (Pinus sp.) und Ahornholz (Acer sp.) bestimmt werden können, die zu ungleichmäßiger Färbung führen. NIR-Spektren wurden mit über Teilflächen gemittelten Werten von Faserwinkel, Dichte, 8-Bit Farbwerten vor und nach der Färbung sowie dem durch die Färbung erzeugten Farbunterschied bei Verwendung von entweder drei, zwei oder einer der untersuchten Holzarten als Eingabeparameter erfolgreich korreliert. Schwierigkeiten traten auf, wenn sowohl Kirsche als auch Ahorn mit den beiden anderen Holzarten in einem umfassenden Modell zusammengefasst wurden. Wenn jedoch beide ausgeschlossen wurden, ergab das Modell sehr hohe R2-Werte (über 0,98).
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Acknowledgments
This work was financially supported by a research grand provided by the Natural Resources Canada (NRCan), Value-to-Wood program. We also thank Profs Shawn Mansfield and Phil Evans for the NIR spectrometer donation and assistance with the finishing wood properties, respectively. MiCROTEC’s GOLDENEYE specimen scanning and data analysis is greatly appreciated.
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Lazarescu, C., Panagiotidis, K. & Avramidis, S. Color variation of stained wood products in association to near infrared spectroscopy scans. Eur. J. Wood Prod. 72, 81–85 (2014). https://doi.org/10.1007/s00107-013-0758-4
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DOI: https://doi.org/10.1007/s00107-013-0758-4