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關(guān)于超聲波接收電路和傳輸?shù)幕驹?超聲波的傳輸幾乎不受光、灰塵、煙霧、電磁干擾和有毒氣體的影響，可以通過氣體、液體和中間體進行傳輸，因此廣泛應用于工業(yè)生產(chǎn)和民用領(lǐng)域，如超聲波測距、超聲波清洗機、醫(yī)用超聲波檢測等。<br>壓電換能器作為聲能和電能的轉(zhuǎn)換裝置，直接影響整個超聲波m測量系統(tǒng)的性能。壓電換能器驅(qū)動電路的設計涉及阻抗匹配、脈沖換能器設計和振動換能器，既需要理論基礎，又需要實踐經(jīng)驗，是r&d人員面臨的一項艱巨任務。<br>國內(nèi)壓電換能器的驅(qū)動電路主要采用兩種設計方法:<br>一種是直接驅(qū)動:<br>壓電換能器采用固定頻率，通過觸發(fā)大功率半導體開關(guān)器件直接驅(qū)動，如場效應管和可控硅，換能器直接由電源電壓供電。這種電路的優(yōu)點是電路簡單，缺點是工作效率低，受電源電壓限制，不能驅(qū)動大功率器件。<br>二、推挽電路驅(qū)動:<br>采用固定頻率的雙極脈沖驅(qū)動推挽變壓器工作。推挽變壓器的次級與壓電換能器并聯(lián)，電容和電感用于阻抗匹配。這種電路的優(yōu)點是可以驅(qū)動大功率器件，缺點m是很難進行阻抗匹配和寬電壓。由于另一種激勵模式，換能器的兩端不會諧振，如果沒有很好的匹配和調(diào)諧，工作效率會相對較低。<br>根據(jù)不同的應用，如電源、收發(fā)器集成、診斷和治療，換能器驅(qū)動電路的具體實現(xiàn)會有所不同。超聲波發(fā)射和接收電路是*的關(guān)鍵部分。整個電路分為發(fā)射和接收兩部分，共用同一個陣元。發(fā)射部分產(chǎn)生由發(fā)射輸入驅(qū)動的激勵波形，并激勵陣列元件以產(chǎn)生超聲波。接收單元接收人體組織中超聲波的回波，并通過接收電路放大、顯示和輸出回波信號。<br>關(guān)鍵詞：超聲波清洗機變壓器 <br> <div class="1xx5uidq" id="contentb"></div> </div> <div id="1xx5uidq" class="clearfix"></div> </div> <div>上一個：<a 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