Development of Wood Property Calibrations Using near Infrared Spectra Having Different Spectral Resolutions

Abstract

A range of important wood properties can be predicted using calibrations obtained using SilviScan data and diffuse reflectance near infrared (NIR) spectra collected from wooden strips cut from increment cores. The ease of NIR measurements and the rapid provision of SilviScan data provides the opportunity to establish extremely large data sets, causing calibration problems. An option is to reduce the number of data points representing an individual NIR spectrum. NIR spectra were collected in 10 mm increments from the radial longitudinal face of 89 Pinus taeda L. (loblolly pine) breast height (1.30 m) wooden strips using a Foss NIRSystems 5000 [wavelength range 1100-2498 nm, spectral sampling interval (SSI) 2 nm]. Air-dry density, microfibril angle (MFA) and stiffness calibrations were obtained using SSIs ranging from 2 to 64 nm. Calibrations developed using NIR spectra having SSIs of 4 or 8 nm performed as well as those obtained at 2 nm. As resolution was decreased (SSI increased), the quality of the calibrations associated with the various wood properties was affected to different degrees. The MFA calibration was the most affected and air-dry density the least.

Effects of Antimicrobial Coating from Catfish Skin Gelatin on Quality and Shelf Life of Fresh White Shrimp (Penaeus vannamei)

“…All spectrums were averaged at 10‐nm intervals prior to data analysis. It has been shown that a 10‐nm average has no detrimental influence on model precision and performance (Schimleck and others 2004).…”

Within Tree Variation of Lignin, Extractives, and Microfibril Angle Coupled With the Theoretical and Near Infrared Modeling of Microfibril Angle

“…Forty scans were acquired at 1 nm intervals using reflectance spectroscopy and then averaged. The 1 nm intervals were next averaged into 10 nm intervals with no loss in spectral resolution (Schimleck et al 2004). The spot size of the scanning area was 5 mm.…”

Influência da idade na geração de modelos de espectroscopia NIR, para predição de propriedades da madeira de Eucalyptus spp.

“…A técnica NIRS tem provado ser ferramenta útil nos programas de melhoramento para seleção de espécies envolvendo grande número de árvores (SCHIMLECK et al, 2004), e os pesquisadores pioneiros dessa técnica em madeira foram Birkett e Gambino (1998), Easty et al (1990) e Wright et al (1990). Muitos trabalhos relacionam a utilização de NIRS para análises de propriedades químicas da madeira como lignina e extrativos (BRINKMANN et al, 2002;GIERLINGER et al, 2002;BOERIU et al, 2004;ALVES et al, 2006) e de propriedades físicas como a densidade básica (HOFFMEYER;PEDERSEN, 1995;SCHIMLECK et al, 1999;SCHIMLECK et al, 2004;HEIN et al, 2009).…”

“…Muitos trabalhos relacionam a utilização de NIRS para análises de propriedades químicas da madeira como lignina e extrativos (BRINKMANN et al, 2002;GIERLINGER et al, 2002;BOERIU et al, 2004;ALVES et al, 2006) e de propriedades físicas como a densidade básica (HOFFMEYER;PEDERSEN, 1995;SCHIMLECK et al, 1999;SCHIMLECK et al, 2004;HEIN et al, 2009).…”