Surface transverse waves on langasite
Surface transverse waves on langasite
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硅酸钙石的表面横波
DOI：
10.1109/ultsym.1998.762118
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
M. Salomaa
中科院分区：
文献类型：
--
作者：
V. Plessky;J. Koskela;S. Lehtonen;M. Salomaa
表面横波在周期换能器中对硅锰矿晶体的旋转 Y 切割进行数值模拟。换能器的谐振和反谐振频率被评估为晶体切割、温度和铝电极厚度的函数。为了实现最佳切割，我们证明了一阶温度系数消失，并发现 ST 切割石英中的耦合强度比瑞利波高几倍。硅酸镁石中的横波与石英中的横波不同，因为硅酸镁石中的剪切波速度低于铝电极中的横波速度，导致共振频率对电极厚度变化的敏感度本质上较低。
Surface transverse waves are numerically simulated in a periodic transducer on rotated Y-cuts of langasite crystal. The resonance and antiresonance frequencies of the transducer are evaluated as functions of the crystal cut, temperature and the thickness of the aluminum electrodes. For an optimal cut, we demonstrate a vanishing first-order temperature coefficient and find a coupling strength several times higher than that for Rayleigh waves in ST-cut quartz. The transverse waves in langasite differ from those in quartz in that the shear-wave velocity in langasite is lower than that in the aluminum electrodes, resulting in an essentially lower sensitivity of the resonance frequency to the thickness variations of the electrodes.