一、光電開關是模擬量還是數字量

光電(dian)開關的信號通常為數字量。

由于光(guang)(guang)電(dian)開(kai)關的輸出(chu)信(xin)號(hao)(hao)往往只有(you)兩種情況(kuang)，即有(you)光(guang)(guang)和斷光(guang)(guang)。因(yin)此，受到檢測物體大小、光(guang)(guang)源亮度、反(fan)射度等(deng)因(yin)素的影響，無(wu)法保證模擬量(liang)的穩定性和準確(que)性。相比(bi)之下，數字量(liang)信(xin)號(hao)(hao)不受這(zhe)些因(yin)素的影響，根據輸出(chu)的電(dian)壓(ya)或(huo)電(dian)流值是否超過設定門(men)檻，輸出(chu)0或(huo)1的數字信(xin)號(hao)(hao)更加穩定、準確(que)，且(qie)易于處理和傳輸，因(yin)此光(guang)(guang)電(dian)開(kai)關通常輸出(chu)數字量(liang)信(xin)號(hao)(hao)。

二、光電開關是直流還是交流

光電開關(guan)的供電可以(yi)是直流也可以(yi)是交流。

光(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開關(guan)的供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)種(zhong)類(lei)包(bao)括直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)式(shi)、交(jiao)流(liu)(liu)(liu)(liu)式(shi)和直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)交(jiao)流(liu)(liu)(liu)(liu)混合(he)式(shi)三種(zhong)。直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)式(shi)光(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開關(guan)采(cai)用直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓范(fan)圍(wei)一(yi)般為12-24V（10-30V）的直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓。交(jiao)流(liu)(liu)(liu)(liu)式(shi)光(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開關(guan)則采(cai)用交(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓范(fan)圍(wei)為90-240V交(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，適(shi)用于110VAC與220VAC場合(he)的供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)。而直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)交(jiao)流(liu)(liu)(liu)(liu)混合(he)式(shi)光(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開關(guan)則允(yun)許直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓與交(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓都可以(yi)直(zhi)(zhi)(zhi)接接入同一(yi)個供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)回路，直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓范(fan)圍(wei)為12-240V，交(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓范(fan)圍(wei)為24-240V，這種(zhong)形式(shi)具有較(jiao)高的適(shi)應性，不需(xu)要(yao)考慮配電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的問題(ti)。

因此，光電(dian)開(kai)關的供(gong)電(dian)方(fang)式既可(ke)以是(shi)直流(liu)也可(ke)以是(shi)交(jiao)流(liu)，具體取決(jue)于其(qi)設計(ji)時所采用的供(gong)電(dian)形(xing)式。

三、光電開關是有源還是無源

光電開關既有(you)(you)有(you)(you)源型，也有(you)(you)無源型。

1、有源型光電開關：需要另外提供一個電源或(huo)信號源才能驅動它(ta)的工作。例如，光(guang)電耦合器、光(guang)電轉換器等。

2、無源型光電開關：不(bu)需要外(wai)部電源(yuan)或(huo)信(xin)號源(yuan)，它可以直接(jie)將光信(xin)號轉換(huan)成電信(xin)號輸出。例如，光電二極管、光敏(min)三極管等。

需要(yao)注意的(de)是，無源(yuan)型光電開關需要(yao)有(you)(you)較(jiao)高(gao)的(de)光照強度才能(neng)工作，因此其(qi)檢測距(ju)離(li)一(yi)般(ban)比(bi)有(you)(you)源(yuan)型的(de)短。