超聲波流量測(cè)量主要有兩種方法：多普勒法，即利用介質(zhì)反射聲波使頻率發(fā)生改變，聲源和接收聲波的介質(zhì)相對(duì)運(yùn)動(dòng)時(shí)產(chǎn)生頻差。運(yùn)行時(shí)間法，即聲速疊加介質(zhì)流速，若超聲波與水流方向一致，則運(yùn)行時(shí)間短，反之運(yùn)行時(shí)間就長(zhǎng)，流速可由運(yùn)行時(shí)間差運(yùn)算得來(lái)
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