Research related to acoustic/ultrasonic guided wave testing in wood is still at an early stage. This paper describes the first study to perform ultrasonic guided wave measurements in a wooden rod using arrays of shear transducers. Enhancement of either longitudinal L(0,1) or torsional T(0,1) wave modes and suppression of other modes was able to be achieved using these arrays. At low frequencies, it was found that the L(0,1) wave mode had a similar speed to that obtained using the traditional resonance and time of flight methods. The torsional T(0,1) wave mode has not been used before for non-destructive testing of wood. Since it is non-dispersive, it would appear to be suitable for wood property estimation and structural health monitoring of wooden structures. These results indicate that ultrasonic guided wave testing techniques have strong potential to be used to provide improved measurement of wood properties and structural health monitoring of wooden structures.

与木材中的声学/超声波导波测试相关的研究仍处于早期阶段。本文描述了使用剪切换能器阵列在木杆中进行超声导波测量的第一项研究。使用这些阵列能够增强纵向 L(0,1) 或扭转 T(0,1) 波模式和抑制其他模式。在低频下，发现 L(0,1) 波模式的速度与使用传统共振和飞行时间方法获得的速度相似。扭转 T(0,1) 波模式之前尚未用于木材的无损检测。由于它是非分散的，它似乎适用于木结构的木材特性估计和结构健康监测。