Air-coupled ultrasonic assessment of wood veneer |
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Authors: | Erik Blomme Dirk Bulcaen Tijl Cool Filip Declercq Pieter Lust |
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Institution: | Katholieke Hogeschool Zuid-West-Vlaanderen (KATHO), K.U. Leuven Association, Doorniksesteenweg 145, 8500 Kortrijk, Belgium |
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Abstract: | Air-coupled ultrasound (ACU) provides a tool to evaluate wood samples of small or moderate thickness (<30 mm) thereby avoiding direct contact or liquid coupling. Results of through-transmission ACU measurements on wood veneer samples and related products are reported with respect to a wide variety of quality aspects. Fluctuations in the averaged received signal levels appear to be correlated to the presence of natural or machine-induced thickness and density variations, flaws and grain damage, errors produced by the manufacturing process, insufficient bonding on a substrate, etc. In addition it is seen that the variability of the signal levels enables to distinguish between quarter and crown areas. |
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Keywords: | 43 35 Zc 43 20 Ye 81 70 Cv |
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