组装了一套脉冲回波重叠法系统,测量了铌酸锂、钽酸锂,锗酸铋等晶体的声表面波延迟时间,声速,机电耦合系数和温度系数。在30兆赫的声同步频率下,测时精度达0.6毫微秒,用本文样品测量声表面波速度的相对误差最大值不超过5×10~(-4)。 A set of pulse echo overlap method was assembled to measure the surface acoustic wave delay time, velocity of sound, electromechanical coupling coefficient and temperature coefficient of lithium niobate, lithium tantalate and bismuth germanate. The accuracy of measurement is up to 0.6 nanosecond at 30 MHz acoustic synchronous frequency. The maximum relative error of SAW velocity measured by this sample does not exceed 5 × 10 -4.