超聲波流量計(jì)的原理及應(yīng)用（2003年大連索尼卡恩威公司服務(wù)部）一．引言首先家簡單介紹一下流量計(jì)的概念凡是有物質(zhì)流動(dòng)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(shí)流量（Flow Rate）和累計(jì)流量（Total Flow）瞬時(shí)流量（Flow Rate）：單位時(shí)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(xué)公式： v為流體的體積,工程上常
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