Air-coupled ultrasonic assessment of wood veneer.
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.
Blomme
Erik
E
Katholieke Hogeschool Zuid-West-Vlaanderen (KATHO), K.U. Leuven Association, Doorniksesteenweg 145, 8500 Kortrijk, Belgium. erik.blomme@katho.be
Bulcaen
Dirk
D
Cool
Tijl
T
Declercq
Filip
F
Lust
Pieter
P