Angular and frequency spectral analysis of the ultrasonic backward beam displacement on a periodically grooved solid.
Angular and frequency spectral analysis of the ultrasonic backward beam displacement on a periodically grooved solid.
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DOI：
10.1121/1.3243467
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发表时间：
2009-12
期刊：
影响因子：
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通讯作者：
S. Herbison;N. Declercq;M. Breazeale
中科院分区：
文献类型：
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作者：
S. Herbison;N. Declercq;M. Breazeale
实验研究了受约束波束入射到周期波纹液固界面上时的超声回波位移。以前在一个特定频率(6 MHz)和一个相应的入射角(22.5度)下对周期性水-黄铜界面的这种影响进行了研究，但问题是在其他频率和角度组合下是否也存在这种影响。了解这一现象是否是符合的，或者它是否会发生在其他频率和角度组合上，有助于更好地理解超声与周期结构的相互作用，特别是衍射效应。在声子晶体的研究和材料的非破坏性评价方面存在潜在的应用。本工作报告了最近在同一周期性凹槽黄铜样品上的实验结果，该样品被用于首次研究这一现象。通过对角谱图和经典谱图的频谱分析，本文报道的实验表明，在多个入射角度和频率下，都会发生光束后向位移。此外，还证明了光束向后位移的确切原因，即向后传播的Scholte-Stoneley波。
The ultrasonic backward beam displacement, which has been shown to occur when a bounded beam is incident upon a periodically corrugated liquid-solid interface, is studied experimentally. This effect has been previously studied on a periodic water-brass interface at one particular frequency (6 MHz) and one corresponding angle of incidence (22.5 degrees), but the question has remained whether it would also exist at other frequency and angle combinations. The knowledge of whether this phenomenon is a coincidence or whether it will occur for other frequency and angle combinations contributes to a better understanding of the interaction of ultrasound with periodic structures and diffraction effects, in particular. Potential applications exist in the study of phononic crystals and in the non-destructive evaluation of materials. The present work reports results from recent experiments on the same periodically grooved brass sample that was employed in the first investigations of this phenomenon. Through the examination of frequency spectra in the form of angular and classical spectrograms, the experiments reported here show the backward beam displacement to occur for multiple angles of incidence and frequencies. Furthermore, evidence is shown as to the exact cause of the backward beam displacement, namely, a backward propagating Scholte-Stoneley wave.