一、光電開關是模擬量還是數字量

光電開(kai)關的信號通常為數字(zi)量。

由(you)于(yu)光(guang)電開關(guan)的輸(shu)出(chu)(chu)(chu)信(xin)號往往只有兩種情況，即有光(guang)和斷光(guang)。因(yin)此，受到檢測物體(ti)大(da)小、光(guang)源亮度、反射度等因(yin)素的影響，無法保(bao)證(zheng)模擬量的穩定(ding)性(xing)和準(zhun)確(que)性(xing)。相比之下(xia)，數(shu)字(zi)量信(xin)號不受這些因(yin)素的影響，根據輸(shu)出(chu)(chu)(chu)的電壓或電流值是否超過設定(ding)門檻，輸(shu)出(chu)(chu)(chu)0或1的數(shu)字(zi)信(xin)號更加穩定(ding)、準(zhun)確(que)，且易于(yu)處(chu)理和傳輸(shu)，因(yin)此光(guang)電開關(guan)通常(chang)輸(shu)出(chu)(chu)(chu)數(shu)字(zi)量信(xin)號。

二、光電開關是直流還是交流

光電開關的供電可以(yi)是直流也(ye)可以(yi)是交流。

光(guang)(guang)(guang)電(dian)(dian)(dian)開(kai)關的供(gong)電(dian)(dian)(dian)種類包括(kuo)直(zhi)流(liu)(liu)(liu)(liu)式(shi)(shi)、交(jiao)(jiao)(jiao)流(liu)(liu)(liu)(liu)式(shi)(shi)和直(zhi)流(liu)(liu)(liu)(liu)交(jiao)(jiao)(jiao)流(liu)(liu)(liu)(liu)混合式(shi)(shi)三種。直(zhi)流(liu)(liu)(liu)(liu)式(shi)(shi)光(guang)(guang)(guang)電(dian)(dian)(dian)開(kai)關采用(yong)直(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)供(gong)電(dian)(dian)(dian)，電(dian)(dian)(dian)壓(ya)(ya)范圍(wei)(wei)一般為12-24V（10-30V）的直(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)。交(jiao)(jiao)(jiao)流(liu)(liu)(liu)(liu)式(shi)(shi)光(guang)(guang)(guang)電(dian)(dian)(dian)開(kai)關則(ze)采用(yong)交(jiao)(jiao)(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)供(gong)電(dian)(dian)(dian)，電(dian)(dian)(dian)壓(ya)(ya)范圍(wei)(wei)為90-240V交(jiao)(jiao)(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)，適用(yong)于110VAC與220VAC場合的供(gong)電(dian)(dian)(dian)。而直(zhi)流(liu)(liu)(liu)(liu)交(jiao)(jiao)(jiao)流(liu)(liu)(liu)(liu)混合式(shi)(shi)光(guang)(guang)(guang)電(dian)(dian)(dian)開(kai)關則(ze)允許(xu)直(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)與交(jiao)(jiao)(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)都可以直(zhi)接接入同一個供(gong)電(dian)(dian)(dian)回路，直(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)范圍(wei)(wei)為12-240V，交(jiao)(jiao)(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)范圍(wei)(wei)為24-240V，這種形式(shi)(shi)具有較高的適應性，不需要考(kao)慮配(pei)電(dian)(dian)(dian)的問題。

因(yin)此，光電(dian)開(kai)關的供電(dian)方(fang)式既可(ke)(ke)以是(shi)直流也可(ke)(ke)以是(shi)交(jiao)流，具體取決于其(qi)設計時所采用的供電(dian)形式。

三、光電開關是有源還是無源

光電開關既有有源型，也(ye)有無源型。

1、有源型光電開關：需要另(ling)外提(ti)供一個(ge)電源或信號源才能驅動它的工(gong)作。例如，光(guang)電耦合(he)器、光(guang)電轉換器等。

2、無源型光電開關：不需要外部(bu)電(dian)源或信(xin)(xin)號源，它可以直接將(jiang)光信(xin)(xin)號轉換成電(dian)信(xin)(xin)號輸出。例如，光電(dian)二(er)極管(guan)、光敏三(san)極管(guan)等。

需(xu)要注(zhu)意的是，無源(yuan)(yuan)型(xing)(xing)光電開關(guan)需(xu)要有(you)(you)較高的光照強(qiang)度(du)才能工作，因此其檢測距離一般(ban)比有(you)(you)源(yuan)(yuan)型(xing)(xing)的短。