【摘要】 在物理实验中常利用在1对换能器之间形成的驻波测量声速.该实验是通过调节两换能器之间的距离观察接收换能器上声压(幅度或相位)变化规律获得波长.但部分文献在陈述换能器上声压随两换能器之间的距离的变化关系时,没有表达清楚或者表述错误.本文以一维黏性媒质波动方程为基础,详细给出了声压随两换能器之间的距离的变化关系.更多还原

【Abstract】 In the experiment of measuring sound velocity,the sound velocity is generally measured by producing standing waves between a couple of ultrasonic transducer.The wavelength is obtained by means of observing the variation of sound pressure (amplitude or phase) on the receiver surface with the distance between the receiver and emitter.But the relation between sound pressure on the receiver and the distance between receiver and emitter is not given correctly in some literatures.This paper deduces the sound pressure on the receiver as a function of the distance between receiver and emitter based on one-dimensional differential wave equation in viscous medium.更多还原