超声波声速测量新方法

A new method for accurate measurement of the velocity of supersoinic wave

双踪示波法是测量声速的一种新方法 .它利用示波器的双踪功能 ,以发射信号的波形为参考对象 ,与接收信号波形直接进行比较 .当连续单向移动接收换能器时 ,可观察到发射信号的波形与接收信号波形发生多次重合现象 .连续两次重合图象所对应的位置值之差就是我们所要测量的波长值 .双踪示波法不仅适用于测量声波在空气中的传播速度 ,同样也可以用于测量声波在液体中的传播速度 .

Twin-complex oscillometry is a new method,which can for measuring supersonic velocity. Where the twin-complex function of oscillograph is used. With the sent signal wave chosen as the reference object, it can be compared directly with the receptive signal by twin-complex oscillograph. The phenomenon that the receptive signal wave is surperposed with the transmitted signal wave when the receptive equipment is moved continuously along a single direction. The position dispersion of two continuous wave superposition is the wave-length of the sonic velocity. Twin-complex oscillometry can not only be applied to supersonic velocity in the air, but also it can be used for supersonic velocity measurement in all kinds of liquids.