德國西門(mén)子超聲波流量計* 西門(mén)子超聲波流量計正確選型才能保證西門(mén)子超聲波流量計更好的使用。選用什么種類(lèi)的西門(mén)子超聲波流量計應根據被測流體介質(zhì)的物理性質(zhì)和化學(xué)性質(zhì)來(lái)決定?使西門(mén)子超聲波流量計的通徑、流量范圍、襯里材料、電極材料和輸出電流等都能適應被測流體的性質(zhì)和流量測量的要求。
西門(mén)子超聲波流量計由超聲波換能器、電子線(xiàn)路及流量顯示和累積系統三部分組成。超聲波發(fā)射換能器將電能轉換為超聲波能量,并將其發(fā)射到被測流體中,接收器接收到的超聲波信號,經(jīng)電子線(xiàn)路放大并轉換為代表流量的電信號供給顯示和積算儀表進(jìn)行顯示和積算。這樣就實(shí)現了流量的檢測和顯示。
西門(mén)子超聲波流量計常用壓電換能器。它利用壓電材料的壓電效應,采用適出的發(fā)射電路把電能加到發(fā)射換能器的壓電元件上,使其產(chǎn)生超聲波振勸。超聲波以某一角度射入流體中傳播,然后由接收換能器接收,并經(jīng)壓電元件變?yōu)殡娔?,以便檢測。發(fā)射換能器利用壓電元件的逆壓電效應,而接收換能器則是利用壓電效應。
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德國西門(mén)子超聲波流量計*
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