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