Calibration of SilviScan data of Cryptomeria japonica wood concerning density and microfibril angles with NIR hyperspectral imaging with high spatial resolution
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Te Ma
Abstract
Wood density and microfibril angle (MFA) are strongly correlated with wood stiffness, swelling/shrinkage, and its anisotropy. Understanding the spatial distribution of these data is critical for solid timber applications. In this study, near-infrared (NIR) hyperspectral imaging has been calibrated for evaluation of wood density and MFA in an effective manner. Briefly, five wood samples collected from both normal wood (NW) and compression wood (CW) moieties of two different Cryptomeria japonica trees were analyzed. Partial least squares (PLS) regression analysis was performed to determine the relationship between X-ray densitometry data obtained by SilviScan and NIR spectra, and cross-validation (leave-one-out) approach served for prediction performances. The validation coefficient of determination (r2) between the predicted densities by the NIR technique and the X-ray data was 0.83 with a root mean squared error of cross-validation (RMSECV) of 105.2 kg m−3. Regarding MFA, the r2 was 0.77 and RMSECV 5.36°. Wood density was successfully maped as well as the MFA at a high spatial resolution. As a result, the detection of annual growth ring features and evaluation of aspects of heterogeneous wood quality has been facilitated. The mapping results were visually checked by looking at the difference between earlywood (EW) and latewood (LW) for density and by means of the Mäule color reaction indicating high lignin contents in CW in terms of MFA validation as CWs have high MFA values.
Acknowledgments
The authors would like to thank Nelson Uy and Tessie Tong at FPInnovations, Vancouver, BC.108 Canada for SilviScan reference data measurement in this research.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Carbon fibres from precursors produced by dry-jet wet-spinning of kraft lignin blended with kraft pulps
- Characterization of the precipitated lignin from Japanese beech as treated by semi-flow hot-compressed water
- Chemical effects of a mild torrefaction on the wood of eight Eucalyptus species
- Analysis of distribution of wood extractives in Gmelina arborea by gas chromatography and time-of-flight secondary ion mass spectrometry
- Water sorption hysteresis in wood: I review and experimental patterns – geometric characteristics of scanning curves
- Water sorption hysteresis in wood: II mathematical modeling – functions beyond data fitting
- Relations of density, polyethylene glycol treatment and moisture content with stiffness properties of Vasa oak samples
- Facile surface hydrophobization of medium-density fiberboard (MDF) by silver deposition
- Calibration of SilviScan data of Cryptomeria japonica wood concerning density and microfibril angles with NIR hyperspectral imaging with high spatial resolution
- Thermal diffusivity measurement of Phyllostachys edulis (Moso bamboo) by the flash method
- The effects of brown-rot decay on select wood properties of poplar (Populus cathayana Rehd.) and its mechanism of action
Artikel in diesem Heft
- Frontmatter
- Carbon fibres from precursors produced by dry-jet wet-spinning of kraft lignin blended with kraft pulps
- Characterization of the precipitated lignin from Japanese beech as treated by semi-flow hot-compressed water
- Chemical effects of a mild torrefaction on the wood of eight Eucalyptus species
- Analysis of distribution of wood extractives in Gmelina arborea by gas chromatography and time-of-flight secondary ion mass spectrometry
- Water sorption hysteresis in wood: I review and experimental patterns – geometric characteristics of scanning curves
- Water sorption hysteresis in wood: II mathematical modeling – functions beyond data fitting
- Relations of density, polyethylene glycol treatment and moisture content with stiffness properties of Vasa oak samples
- Facile surface hydrophobization of medium-density fiberboard (MDF) by silver deposition
- Calibration of SilviScan data of Cryptomeria japonica wood concerning density and microfibril angles with NIR hyperspectral imaging with high spatial resolution
- Thermal diffusivity measurement of Phyllostachys edulis (Moso bamboo) by the flash method
- The effects of brown-rot decay on select wood properties of poplar (Populus cathayana Rehd.) and its mechanism of action
