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Licensed Unlicensed Requires Authentication Published by De Gruyter September 4, 2012

Measurement of intra-ring wood density by means of imaging VIS/NIR spectroscopy (hyperspectral imaging)

Armando Fernandes, José Lousada, José Morais, José Xavier, João Pereira and Pedro Melo-Pinto
From the journal Holzforschung

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.


Corresponding author. CITAB – Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal

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