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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >Ultrasonic energy propagation through wood: where, when, how much
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Ultrasonic energy propagation through wood: where, when, how much

机译：超声波能量在木材中的传播：在哪里，何时，多少

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Nondestructive testing of wood using ultrasound utilizes propagation speed and/or energy loss to indicate the state of a test sample. The propagation velocity of an ultrasonic pulse provides very valuable information because of the well-know connection to elastic moduli, C = ρv~2. Our recent research has shown that, due to the anisotropic nature of wood, intuitive identification of the elastic modulus being measured in a given experiment is not always correct. Our research also showed that the two quantities needed to determine a velocity, distance traveled and time of flight, may be misidentified due to the nature of wood. We further found that ultrasonic energy incident on wood will almost always be split into three components, at least two of which carry significant amounts of the incident energy. This paper summarizes our results and discusses the potential problems and pitfalls for any ultrasonic evaluation which arise from the anisotropic, inhomogeneous nature of wood. Our findings point out some significant challenges to successful ultrasonic NDT of wood, but also point to new opportunities for overcoming the challenges and for significantly broadening the scope of wood NDT. The paper concludes with suggestions for new approaches to ultrasonic measurements.
机译：使用超声波对木材进行的非破坏性测试利用传播速度和/或能量损失来指示测试样品的状态。超声波脉冲的传播速度提供了非常有价值的信息，这是因为众所周知，它与弹性模量有关，C =ρv〜2。我们最近的研究表明，由于木材的各向异性，在给定的实验中直观地确定所测量的弹性模量并不总是正确的。我们的研究还表明，由于木材的性质，可能会错误地确定确定速度，行进距离和飞行时间所需的两个量。我们进一步发现，入射在木材上的超声波能量几乎总是被分成三个部分，其中至少两个携带大量入射能量。本文总结了我们的研究结果，并讨论了由于木材的各向异性，非均质性而引起的任何超声评估的潜在问题和陷阱。我们的发现指出了成功实现木材超声波无损检测的一些重大挑战，同时也指出了克服这些挑战并大大扩大木材无损检测范围的新机会。本文最后提出了新的超声测量方法的建议。

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