S.S. Kelley, T.G. Rials, L.R. Groom, C.-L. So
Use of near infrared spectroscopy to predict the mechanical properties of six softwoods
The visible and near infrared (NIR) (500–2400 nm) spectra
and mechanical properties of almost 1000 small clearwood
samples from six softwood species: Pinus taeda
L. (loblolly pine), Pinus palustris, Mill. (longleaf pine),
Pinus elliottii Engelm. (slash pine), Pinus echinata Mill.
(shortleaf pine), Pinus ponderosa Dougl. ex Laws (ponderosa
pine), and Pseudotsuga menziesii (Mirb.) Franco
(Douglas fir) were measured. Projection to Latent Structures
(PLS) modeling showed that the NIR spectra of
these softwoods could be used to predict the mechanical
properties of the clear-wood samples. The correlation
coefficients for most of these models were greater than
0.80. All six softwood species were combined into one
data set and a PLS model was constructed that effectively
predicted the strength properties of any of the individual
softwoods. Reducing the spectral range to
between 650 and 1050 nm only causes a slight decrease
in the quality of the models. Using this narrow spectral
range enables the use of smaller, faster, lighter, less
expensive spectrometers that could be used either in the
field or for process control applications.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 58, 05/2004
Pages: 252 - 260
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