Open AccessNDE OF LUMBER AND NATURAL FIBER BASED PRODUCTS WITH AIR COUPLED ULTRASOUND
Author(s) -
David K. Hsu,
David Utrata,
Monlin Kuo,
Donald O. Thompson,
Dale E. Chimenti
Publication year - 2010
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.177
H-Index - 75
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.3362250
Subject(s) - materials science , ultrasonic sensor , composite material , delamination (geology) , kenaf , engineered wood , drum , fiber , ultrasound , oriented strand board , waste management , acoustics , mechanical engineering , engineering , paleontology , physics , biology , subduction , tectonics
Due to the porous nature of wood and natural fiber based products, conventional fluid or gel coupled ultrasonic inspection is unsuitable. Air‐coupled ultrasonic transmission scanning, being non‐contact, is ideally suited for inspecting lumber, wood and natural fiber based products. We report here several successful applications of air‐coupled ultrasound for the inspection of wood. Air‐coupled ultrasonic scan at 120 kHz can easily detect “sinker‐stock” lumber in which bacterial damage of ray tissue cells had occurred during anaerobic pond storage. Channels in ash lumber board caused by insect bore were imaged in transmission scan. Delamination and material inhomogeneities were mapped out in manufactured wood and natural fiber products including medium density fiberboards, compression molded shredded waste wood with formaldehyde resin, and acoustic panels molded with kenaf fibers. The study has demonstrated some of the capabilities of air‐coupled ultrasound in the NDE of forest products.
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