驻波法测量声速实验的系统误差分析

Analysis on System Error in Experiment of Sound Velocity Measurement by Standing Wave Method

在驻波法测量声速的实验中,系统误差产生的主要原因是:声波在两端面间多次反射,入射波与反射波并非形成理想驻波;能量损耗以及回程差等。为此,在实验中应采取的措施是:选定压电换能器的反射面与接收面的距离后开始测量;准确判断测量点(极大值的位置);以及改进仪器设备等。

In the experiment of sound velocity measured by standing wave method, error is the main reason：acoustic waves in the surface of two ends of the multiple reflection between problems, incident wave and reflected wave is not the ideal standing wave;energy loss and return difference. Therefore, in the experiments should take measures, selected piezoelectric transducer reflection surface and receiving surface distance after the start of measurement;judge accurately measuring point （maxima location）; and improved instrumentation equipment.