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A COMB TRANSDUCER MODEL FOR GUIDED WAVE MODE CONTROL

机译:导波模式控制的梳状传感器模型

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摘要

A variety of ultrasonic transducers can be used for quantitative NDE. One commonly used is a comb transducer. Design of this probe involves a detailed consideration of its physical and geometrical parameters. These design parameters should provide the best capability for generation and selection of a particular guided wave mode. The comb sizing (element width plus gap) determines the length of the generating wave. Parameter characterization of the comb transducer without time delay features was performed in [1] J. A diverse discussion of techniques for transducer design is described in [4] and some practical NDE applications in guided wave generation are described in [5]. Unfortunately, practical considerations make it difficult to alter a comb's geometry, consequently, restricting the ability to generate an arbitrary point on the dispersion curve. The goal of the current study is to overcome this restriction without adjustment or building another probe, by introducing a time delay profile. This means that each transducer element is excited with some time delay. An arbitrary phase velocity for the excitation of a desired point on the dispersion curve is then selected by determining the appropriate time delay value.
机译:多种超声换能器可用于定量NDE。常用的一种是梳状换能器。该探头的设计涉及其物理和几何参数的详细考虑。这些设计参数应为生成和选择特定的导波模式提供最佳能力。梳齿的大小(元件宽度加上间隙)决定了生成波的长度。在[1] J中进行了无时间延迟功能的梳状换能器的参数表征。在[4]中描述了换能器设计技术的各种讨论,在[5]中描述了一些实际的NDE在导波产生中的应用。不幸的是,出于实际考虑,很难改变梳子的几何形状,因此限制了在色散曲线上生成任意点的能力。当前研究的目的是通过引入时间延迟曲线来克服这种限制,而无需进行调整或构建另一个探针。这意味着每个换能器元件都会有一定的延时被激励。然后通过确定适当的时延值来选择用于激励色散曲线上所需点的任意相速度。

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