Blomme Erik, Bulcaen Dirk, Cool Tijl, Declercq Filip, Lust Pieter
Katholieke Hogeschool Zuid-West-Vlaanderen (KATHO), K.U. Leuven Association, Doorniksesteenweg 145, 8500 Kortrijk, Belgium.
Ultrasonics. 2010 Feb;50(2):180-7. doi: 10.1016/j.ultras.2009.08.004. Epub 2009 Aug 12.
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.
