Results of experimental measurements of ultrasonic leaky Lamb waves and Scholte-Stoneley waves in an immersed plate with a periodic profile are presented. Plate modes and surface modes are generated on a thin fluid-coupled plate due to diffraction and mode conversion on the periodic grooves engraved on the metallic sample. A significant advantage of such a method is its ability to excite guided waves that have a phase velocity lower than the velocity of the fluid. Sharp dips observed in the reflected spectrum at certain frequency positions are related to the existence of Lamb and Scholte-Stoneley modes. Special emphasize is given to the low frequency domain. Experimental data show anomalous ultrasonic dispersion in this region and a mixing between the A/sub 0/ mode and the Scholte-Stoneley mode.
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机译：给出了在具有周期性轮廓的浸没板中超声泄漏兰姆波和肖特尔-史东利波的实验测量结果。由于在金属样品上雕刻的周期性凹槽上的衍射和模式转换，在薄的流体耦合板上会产生板模式和表面模式。这种方法的显着优点是其能够激发相速低于流体速度的导波的能力。在某些频率位置的反射光谱中观察到的急剧下降与兰姆和斯科特-斯通利模式的存在有关。特别强调低频域。实验数据表明，该区域的超声分散异常，并且在A / sub 0 /模式和Scholte-Stoneley模式之间混合。
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