Abstract

The article studies the spectrum of acoustic oscillations generated by interdigital transducers in a plate made from a LiNbO₃ piezocrystal with a thickness on the order of the acoustic wavelength. It is shown that, along with zeroth and higher-order modes, this spectrum also contains odd harmonics of the same modes. Unlike surface waves without dispersion, the harmonic frequencies of normal waves are not exact multiples of their fundamental frequency due to velocity dispersion, and the harmonic amplitudes can differ from the wave amplitudes at fundamental frequencies due to the dispersion of the electromechanical coupling coefficient. The temperature sensitivities of modes and harmonics differ from each other and vary with the fluid loading of the surface.

中文翻译：

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压电薄板中正常高阶声波产生的特征

摘要

这篇文章研究了由LiNbO ₃压电晶体制成的板中的叉指式换能器产生的声振荡的频谱，其厚度约为声波波长。结果表明，除了零阶和高阶模，该频谱还包含相同模的奇次谐波。与没有色散的表面波不同，由于速度色散，正常波的谐波频率不是其基本频率的精确倍数，并且由于机电耦合系数的分散，谐波幅度可能与基本频率的波幅度不同。模和谐波的温度敏感性彼此不同，并随表面的流体负荷而变化。