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Article Dans Une Revue Journal of Near Infrared Spectroscopy Année : 2010

Predicting microfibril angle in Eucalyptus wood from different wood faces and surface qualities using near infrared spectra

Bruno Clair
Loïc Brancheriau
Gilles Chaix

Résumé

The microfibril angle (MFA) of crystalline cellulose in the wood cell wall along the stem axis has major effects on stiffness and longitudinal shrinkage of wood and is of key importance to timber quality. The aims of this study were: (i) to develop partial least square (PLS) regression models for microfibril angle (measured on tangential sections by Xray diffraction) based on NIR spectra measured on tangential and on radial surfaces; ii) to develop PLS regression models for such wood trait based on radial NIR spectra collected from wood surfaces of different quality; and (iii) to verify the reliability of these PLS-R models by external validations. T values were recorded by X-ray diffraction on tangential section while NIR spectra were taken on tangential and radial wood surfaces. PLS-R calibrations for MFA based on tangential NIR spectra were better (R²p=0.72) than those using radial NIR spectra (R²p=0.64). The key role of the chemical components and the effect of surface quality of wood on NIRS calibrations are discussed. Considering the differences between experimental conditions, these findings showed the robustness of the NIR-based models for predicting MFA in Eucalyptus wood, even using spectra taken from different wood faces, and surface qualities.
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Dates et versions

hal-00641286 , version 1 (15-11-2011)

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Paulo Ricardo Gherardi Hein, Bruno Clair, Loïc Brancheriau, Gilles Chaix. Predicting microfibril angle in Eucalyptus wood from different wood faces and surface qualities using near infrared spectra. Journal of Near Infrared Spectroscopy, 2010, 18 (6), pp.455-464. ⟨10.1255/jnirs.905⟩. ⟨hal-00641286⟩
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