Theses and Dissertations

Author

Ignacio Diaz

Issuing Body

Mississippi State University

Advisor

Jones, Paul D.

Committee Member

Seale, R. Daniel

Committee Member

Shmulsky, Rubin

Date of Degree

1-1-2012

Document Type

Graduate Thesis - Open Access

Major

Forest Products

Degree Name

Master of Science

College

College of Forest Resources

Department

Department of Forest Products

Abstract

Over the last several years questions about the strength of structural lumber have been raised. The purpose of this study was to examine the relationship between physically measured wood properties using Near Infrared spectroscopy. Physical properties were determined from (2 x 4 x 2 in.) cut samples. Destructive mechanical testing was performed on 744; 8 feet long, No.2 grade 2x4’s. Diffuse reflectance NIR spectra was collected from the cross-sectional face of each block using FOSS NIR Systems Inc. Model 5000 scanning spectrometer. Calibrations were then created between measured properties and NIR estimates. Density, specific gravity, latewood percentage, MOE and MOR had coefficient of determinations of 0.78, 0.56, 0.02, 0.56, and 0.48 respectively. The low correlation is likely caused by the grade of lumber. Because No.2 lumber has considerable knots, they were the determining factor in strength and stiffness; these results would likely not be similar in a higher grade lumber.

URI

https://hdl.handle.net/11668/18971

Comments

Visual Grading Near Infrared Spectroscopy

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