TECHNICAL NOTE: VELOCITY OF ULTRASONIC WAVES IN LIVE TREES AND IN FRESHLY-FELLED LOGS

Author

Raquel Gonçalves, Cinthya Bertoldo Pedroso, Marcus Vinicius Massak, Fernando Batista, Chiara Barros Secco

ABSTRACT

The objective of this study was to evaluate variations between the velocity of ultrasonic wave propagation in trees and in freshly felled logs as well as to investigate the correlation between those speeds and corrections that would improve this correlation. The study was conducted using 210 exotic trees growing in Brazil, including the species Eucalyptus grandis, Pinus elliottii, Toona ciliata, and Eucalyptus resulting from cloning. Although the velocity of ultrasonic wave propagation in a tree (V_t) is not equal to that in a freshly felled log (V_t), the two values are correlated such that V_t can be obtained from V_st. The regression indicated a nonlinear equation for determining the log velocity from the tree velocity.

KEYWORDS

Forest sector;acoustic evaluation;selection of trees

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