光電開關(guān)是光電接近開關(guān)的簡稱，它是利用被檢測物對光束的遮擋或反射，由同步回路接通電路，從而檢測物體的有無。物體不限于金屬，所有能反射光線（或者對光線有遮擋作用）的物體均可以被檢測。光電開關(guān)將輸入電流在發(fā)射器上轉(zhuǎn)換為光信號射出，接收器再根據(jù)接收到的光線的強弱或有無對目標物體進行探測。安防系統(tǒng)中常見的光電開關(guān)煙霧，工業(yè)中經(jīng)常用它來計數(shù)機械臂的運動次數(shù)。
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