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超聲波換能器工作時有兩個時間的原因

發布日期:2022-04-26 點擊率:78

超聲波換能器,是通過量換能器之間的能量轉換來實現,如圖所示

             

 超聲波脈沖穿過管道從一個傳感器到達另一個傳感器,就像我們在一個風道里打羽毛球一樣,如果用同樣的力拍打,順風時羽毛球速度會快些,逆風時速度則慢些。

同樣,當氣體靜止不動時,聲波會按照一定的速度V(聲速:340/)在兩個傳感器之間傳播。如果管道內的氣體有一定的流速,則順著流速的方向聲波會傳播的快些,逆著流速的方向聲波會傳播的慢一些。那么在長度一定的情況下,順流方向的傳播時間t1就會短,逆流方向的傳播時間t2會長。因此,就出現兩個時間了。

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