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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >DEVELOPMENT OF DISPERSION RELATIONSHIPS FOR LAYERED CYLINDERS USING LASER ULTRASONICS
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DEVELOPMENT OF DISPERSION RELATIONSHIPS FOR LAYERED CYLINDERS USING LASER ULTRASONICS

机译：利用激光超声技术开发层状圆柱体的色散关系

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摘要

This thesis demonstrates the effectiveness of using laser ultrasonic techniques to study the propagation of guided waves in layered cylinders. By using this state-of-the-art technology, it is possible to experimentally measure transient waves in a variety of cylindrical specimens and to study the influence of a number of geometric and material features on these guided waves. It is critical to note that these experimental measurements are only possible because of the high fidelity, unbiased, broadband, point source/point receiver and non-contact nature of laser ultrasonics. One objective fulfilled by this research is an increase in the understanding of the underlying principles of the propagation of guided waves by making benchmark, high fidelity measurements of transient waves in a two-layered cylinder. Another specific accomplishment of this research is a demonstration that it is possible to use a fiber optic delivery system, coupled with a heterodyne interferometer, to generate and detect guided waves from multiple, equally spaced source locations, with an excellent SNR. As a direct result of the high SNR of these experimentally measured transient waveforms, it is possible to use the Prony method to determine dispersion relations, and thus determine the steady-state behavior of cylindrical waveguides. A final motivation for the current research is to experimentally validate the theoretical model developed in [2]. A comparison of theoretical and experimental results demonstrates the fidelity and accuracy of the experimental measurements made in this research; there is excellent agreement, especially considering the complex nature of the phenomena being measured (and modeled).
机译：本文证明了使用激光超声技术研究导波在层状圆柱体中的传播的有效性。通过使用这种最先进的技术，可以通过实验测量各种圆柱形样本中的瞬变波，并研究许多几何和材料特征对这些导波的影响。至关重要的是要注意，这些实验测量仅由于高保真，无偏，宽带，点源/点接收器以及激光超声的非接触特性而才可能进行。这项研究实现的一个目标是，通过对两层圆柱体中的瞬态波进行基准，高保真度测量，来加深对导波传播基本原理的理解。这项研究的另一个特定成就是证明，可以使用光纤传输系统和外差式干涉仪，从多个等间隔的光源位置生成和检测导波，并具有出色的SNR。这些实验测量的瞬态波形的高SNR的直接结果是，可以使用Prony方法确定色散关系，从而确定圆柱波导的稳态行为。当前研究的最终动机是通过实验验证[2]中开发的理论模型。理论和实验结果的比较表明了这项研究中实验测量的保真度和准确性。达成了极好的共识，尤其是考虑到所测量（和建模）的现象的复杂性。

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