用脉冲串声波测量声速

Measuring Sound Velocity by Using a Continuous Train of Sound Waves

测量声速是大学物理实验中一个比较重要的实验,通过对声速的测量可以了解被测介质的声学特性。传统的声速测量方法,利用的是连续声波的干涉现象,有"驻波法"和"相位比较法",但在测量过程中需要传感器之间的相对移动。本文用脉冲串声波测量声速,通过实验发现:该方法的测量误差并不比驻波法和相位比较法大,并且不需要传感器之间的相对移动,操作简便,应用广泛。

Measuring sound velocity is an important physical experiment.It is possible to know the acoustical characteristics of measured medium by measuring sound velocity.Traditional measurable method of sound velocity made use of interfering phenomenon of continuous sound wave,that is the method of standing wave and phase comparison,but it needs to move transducer in sound velocity measurement.This paper talks about measuring sound velocity by using a continuous train of sound waves.The result of the experiment indicated that its measurable error is not larger than that of the method of standing wave and phase comparison,it does not need to move transducer,and the operation is simple,and can be widely used.