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Measurement of intra-ring wood density by means of imaging VIS/NIR spectroscopy (hyperspectral imaging)
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Armando Fernandes
,
José Lousada
Published/Copyright:
September 4, 2012
Abstract
This paper reports a novel application of hyperspectral imaging (a spectroscopic technique) for measuring wood density profiles at the growth ring scale. The measurements were performed with a spatial resolution of 79 µm. In the present case, hyperspectral imaging was used to measure wood sample reflectance for light in the wavelength range between 380 and 1028 nm, with a resolution of approximately 0.6 nm. The work was performed with 34 samples collected from 34 trees of Pinus pinea. A total of 34,093 density points were used to create and validate a partial least-squares (PLS) regression that converts spectroscopic reflectance data into density values. The coefficient of determination value between the present method and X-ray microdensitometry is 0.810 with a root mean squared error of 6.54×10-2 g.cm-3.
Keywords: density; hyperspectral imaging; partial least-squares (PLS); VIS/NIR imaging spectroscopy; wood
Received: 2011-12-15
Accepted: 2012-7-30
Published Online: 2012-09-04
Published in Print: 2013-01-01
©2013 by Walter de Gruyter Berlin Boston
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Keywords for this article
density;
hyperspectral imaging;
partial least-squares (PLS);
VIS/NIR imaging spectroscopy;
wood
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- Masthead
- Masthead
- Original Papers
- Assessment of total phenols and extractives of mahogany wood by near infrared spectroscopy (NIRS)
- Steam pretreatment for enzymatic hydrolysis of poplar wood: comparison of optimal conditions with and without SO2 impregnation
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- Effects of hydrothermal processing on the cellulosic fraction of Eucalyptus globulus wood
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