Graduate Thesis Or Dissertation
 

Detection of defects in wood by ultrasonics

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9593v049r

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  • Ultrasonic wave attenuation and velocity in the transverse direction were used to detect defects in ponderosa pine (Pinus Ponderosa) lumber previously dried from green to 9% moisture content. After ultrasonic testing the boards were visually inspected for defects and classified according to the defects present. An ANOVA with Bonferroni pairwise comparison were used to establish differences between clear and defective wood. There are differences in the parameter means between clear wood and wood containing defects; however, variability in the measured parameters is great, preventing an accurate separation of defective wood from clear wood. Because of this application in industry is limited.
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  • File scanned at 300 ppi (Monochrome, 24-bit Color) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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