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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Correspondence - Acoustic waves in a structure containing two piezoelectric plates separated by an air (vacuum) gap
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Correspondence - Acoustic waves in a structure containing two piezoelectric plates separated by an air (vacuum) gap

机译：对应-包含两个压电板的结构中的声波，两个压电板之间被气隙隔开

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摘要

This paper presents experimental results for the characteristics of acoustic waves propagating in a structure containing two parallel piezoelectric plates (I and II) separated by an air gap. Plate I, made of Y-X lithium niobate, contained two interdigital transducers that excited and received an acoustic wave with shear-horizontal polarization. Piezoelectric plate II, made of lithium niobate, was placed above and between the transducers, separated by a fixed gap. For its certain orientation, the amplitude-frequency characteristic showed sharply defined resonant attenuation peaks, which were situated at an equidistant separation from each other. The depth of the peaks was observed to decrease with a wider gap between the plates. It has been stated that these peaks are associated with the resonant reflections of a slot acoustic wave across the width of plate II. Experimentally determined phase velocities and electromechanical coupling coefficient for the slot wave in the structure under study are in a good agreement with theoretical values for various crystallographic orientations of plate II. A comparison between the experimental and theoretical results has allowed us to state two conditions for the slot wave to exist. The structures described may be employed for noncontact excitation of acoustic waves in the plates and for the development of various liquid, gas, and temperature sensors.
机译：本文介绍了在结构中传播声波特性的实验结果，该结构包含由气隙分隔的两个平行压电板（I和II）。由Y-X铌酸锂制成的板I包含两个叉指式换能器，它们激发并接收水平剪切极化的声波。将由铌酸锂制成的压电板II放置在换能器上方和之间，并用固定间隙隔开。对于其特定方向，振幅-频率特性显示出清晰定义的共振衰减峰，它们位于彼此等距的距离处。观察到峰的深度随着板之间的间隙变宽而减小。已经指出，这些峰与横跨板II的宽度的缝隙声波的共振反射有关。实验确定的结构中缝隙波的相速度和机电耦合系数与板II的各种晶体学取向的理论值非常吻合。实验结果和理论结果之间的比较使我们能够陈述存在缝隙波的两个条件。所描述的结构可用于板中声波的非接触激励以及用于开发各种液体，气体和温度传感器。

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