Impact of the orientation and width of wood rings on the spreading of ultrasound in the wood structure

The subject of the paper is the relationship between ultrasound wave velocity in wood, tree rings orientation and width, and wood mechanical properties (MOE in our case). For measuring, the Arborsonic Decay Detector has been chosen. Sound velocity decreased from radial to tangential direction of measurement. In groups with radial (3) and diagonal (2) position of tree ring, increasing of tree ring width has increased sound velocity. In group with tangential tree ring position no significant influence of tree ring width has been found