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超聲(sheng)(sheng)波流量(liang)計常用壓電(dian)(dian)(dian)換(huan)能(neng)(neng)(neng)器(qi)。它利用壓電(dian)(dian)(dian)材(cai)料的(de)壓電(dian)(dian)(dian)效應(ying)，采用適出的(de)發射電(dian)(dian)(dian)路把電(dian)(dian)(dian)能(neng)(neng)(neng)加(jia)到(dao)發射換(huan)能(neng)(neng)(neng)器(qi)的(de)壓電(dian)(dian)(dian)元件(jian)(jian)上，使(shi)其產生超聲(sheng)(sheng)波振動(dong)。超聲(sheng)(sheng)波以某(mou)一角度射入流體中(zhong)傳播，然后由接(jie)收(shou)(shou)換(huan)能(neng)(neng)(neng)器(qi)接(jie)收(shou)(shou)，并經壓電(dian)(dian)(dian)元件(jian)(jian)變為電(dian)(dian)(dian)能(neng)(neng)(neng)，以便檢測。發射換(huan)能(neng)(neng)(neng)器(qi)利用壓電(dian)(dian)(dian)元件(jian)(jian)的(de)逆壓電(dian)(dian)(dian)效應(ying)，而接(jie)收(shou)(shou)換(huan)能(neng)(neng)(neng)器(qi)則(ze)是利用壓電(dian)(dian)(dian)效應(ying)。