本文介绍一种以测相原理为基础的精确测定弹性表面波延迟时间温度系数的方法.并对测试系统和测量方法等作了详细介绍,列出了铌酸锂和锗酸铋两种晶体的测量结果,误差分析表明:这种方法的精度高于±1.5%.为了便于对材料进行测量,提出了一种实用的电极结构,采用这种结构就可不必在每个样品上制作叉指换能器,从而使测量变得方便而且迅速. In this paper, a method of accurately measuring the temperature coefficient of the surface acoustic wave delay time based on the principle of the phase measurement is introduced, and the test system and the measurement method are introduced in detail. The crystal structures of lithium niobate and bismuth germanate The results of the measurement and error analysis show that the accuracy of this method is higher than ± 1.5%. In order to facilitate the measurement of the material, a practical electrode structure is proposed, which eliminates the need to make an interdigital finger Energy device, so that the measurement becomes convenient and rapid.