超聲波流量計的應用及原理（2003年大連索尼卡儀表公司服務部）一．引言首先家簡單介紹一下流量計的概念凡是有物質(zhì)流動的場合，人們?yōu)檎莆掌鋽?shù)量都需要流量測量。流量分為瞬時流量（Flow Rate）和累計流量（Total Flow）瞬時流量（Flow Rate）：單位時間內(nèi)過封閉管道或明渠有效截面的量。流過的物質(zhì)可以是氣、液、固體。數(shù)學公式： &
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