温度效应对声表面波传播的影响

Influence of Temperature Effect on Propagation of Surface Acoustic Wave

通过引入材料的高阶热膨胀系数和高阶热弹性系数,对半无限大石英晶体内声表面波的传播方程进行了求解,得到了不同温度下的声表面波波速。计算结果表明,温度变化对AT切和ST切石英晶体的声表面波波速有显著影响。最后分析了ST切石英晶体的声表面波的温频特性,结果表明,由温度变化引起的频率漂移很明显。

By introduction of the highorder thermal expansion coefficients and the highorder thermal elastic constants of material, the equations of surface acoustic wave propagation in a semiinfinite quartz crystal have been solved and the wave velocities at different temperature have obtained. Numerical results showed that temperature change has strong effect on wave velocities of surface acoustic wave propagation in ATcut and STcut quartz crys tal. Then we investigated the frequencytemperature characteristics of surface acoustic wave propagation in STcut quartz crystal and found that the frequency shift caused by temperature change is significant.