空气中声速测量实验研究

Measurement of sound speed in air

通过实验,应用相位比较法和驻波法对空气中的声速测量进行了研究.结果表明,声波在空气中传播的主要能量损失为粘滞吸收;应用相位比较法,以直线为基准位置、取值间隔为半波长,对声速的测量结果最为精确;驻波法中形成的声场不是理想驻波场,且波节处振幅不为零.

The measurement of sound speed in the air is studied in the experiment by phase comparison method and standing wave method. The following are the results: the main energy loss of sound in the air is viscous absorb, and with phase comparison method, if the standard position is line and the interval is half of one wave, the measurement results are very accurate. In standing wave method, the sound is not perfect standing wave, so the swing is not zero at wave knot.