中文摘要：

声速测量实验中,存在接收换能器上的声压幅度极大值和极小值随两换能器之间距离的增大而衰减的现象,此种现象通常以粘滞媒质理论定性解释,然而粘滞媒质理论计算的结果与实验结果相差甚远,本文引入衍射效应,对施加到接收换能器上声压幅度极值进行理论分析及计算,得到了理论和实验较好的吻合结果.

英文摘要：

In physics experiment of measuring sound speed, the maxima and minima of sound pressure applied to the receiver transducer will reduce with the distance between two transducer increasing. This phenomenon is explained usually by using viscous medium theory. However, there is still a huge difference between the theory calculation and the experiment. The diffraction effect is introduced to explain above phenomenon. The results show good agreement between theory analysis and experiments.