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