This paper reports on a study of the variation of ultrasonic velocity with the length of the specimen of pinus caribaea (Pinus caribaea var. caribaea) eucalipto citriodora (Eucalyptus citriodora), eucalipto grandis (Eucalyptus grandis) and jatobá (Hymenaea sp). Ultrasonic measurements were taken with an experimental apparatus having 22 kHz transducers. Tests were carried out with length from 300 cm to 10 cm and constant cross-section (12 cm x 5 cm). The results showed that velocity of ultrasonic waves is sensitive to changes in the distance between transducers and wavelength (lambda). The adjustment between the frequency of transducer and the length of the specimen is essential in order to obtain correct measurements of ultrasonic velocity in wood.
Wood; ultrasound; wavelength
