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超聲波流量計

多普勒超聲波流量計測量原理

發(fā)布日期:2022-05-11 點擊率:116


多普勒超聲波流量計的測量原理是以物理學中的多普勒效應為基礎的。根據聲學多普勒效應,當聲源和觀察者之間有相對運動時,觀察者所感受到的聲頻率將不同于聲源所發(fā)出的頻率。這個因相對運動而產生的頻率變化與兩物體的相對速度成正比。

  在多普勒超聲波流量計流量測量方法中,超聲波發(fā)射器為一固定聲源,隨流體一起運動的固體顆粒起了與聲源有相對運動的“觀察者”的作用,當然它僅僅是把入射到固體顆粒上的超聲波反射回接收據。發(fā)射聲波與接收聲波之間的頻率差,就是由于流體中固體顆粒運動而產少的聲波多普勒頻移。由于這個頻率差正比于流體流速,所以測量頻差可以求得流速。進而可以得到流體的流量。

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