800FP-P3800FM-P3800FM-P3MD3C800FM-P3MN3G800FM-P3MN5G800FM-P3MN7G800FM-P3MQ3G800FM-P3PN3G800FM-P3PN5G800FM-P3PN7G800FM-P3PQ3G800FP-P3-BP800FP-P3MN3G800FP-P3MN5G800FP-P3MN7G800FP-P3MQ3G800FP-P3PD0C800FP-P3PD3C800FP-P3PN3G800FP-P3PN5G800FP-P3PN7G800FP-P3PQ5G 在不同的場(chǎng)合使用不同的光電開關(guān)，例如在電磁振動(dòng)供料器上經(jīng)常使用光纖式光電開關(guān)，在間歇式包裝機(jī)包裝膜的供送中經(jīng)常使用漫反射式光電開關(guān)，在連續(xù)式高速包裝機(jī)中經(jīng)常使用槽式光電開關(guān)。右圖所示是反射式光電開關(guān)的工作原理框圖。圖中，由振蕩回路產(chǎn)生的調(diào)制脈沖經(jīng)反射電路后，然后用數(shù)字積分光電開關(guān)或RC積分方式排除干擾，最后經(jīng)延時(shí)（或不延時(shí)）觸發(fā)驅(qū)動(dòng)器輸出光電開關(guān)控制信號(hào)。
利用光學(xué)元件，在傳播媒介中間使光束發(fā)生變化；利用光束來反射物體；使光束發(fā)射經(jīng)過長(zhǎng)距離后瞬間返回。光電開關(guān)是由發(fā)射器、接收器和檢測(cè)電路三部分組成。發(fā)射器對(duì)準(zhǔn)目標(biāo)發(fā)射光束，發(fā)射的光束一般來源于發(fā)光二極管（LED）和激光二極管。光束不間斷地發(fā)射，或者改變脈沖寬度。受脈沖調(diào)制的光束輻射強(qiáng)度在發(fā)射中經(jīng)過多次選擇，朝著目標(biāo)不間接地運(yùn)行。接收器有光電二極管或光電三極管組成。在接收器的前面，裝有光學(xué)元件如透鏡和光圈等。在其后面的是檢測(cè)電路，它能濾出有效信號(hào)和應(yīng)用該信號(hào)。
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