一、光電開關是模擬量還是數字量

光電開關的信(xin)號通常為數字量。

由于(yu)(yu)光(guang)電(dian)(dian)開(kai)關的(de)輸(shu)出(chu)(chu)信(xin)號往往只(zhi)有兩種情況，即(ji)有光(guang)和(he)斷光(guang)。因(yin)此，受到(dao)檢測(ce)物體大小、光(guang)源亮度、反射度等因(yin)素的(de)影響，無法保證模擬量的(de)穩(wen)定(ding)性(xing)和(he)準(zhun)(zhun)確(que)性(xing)。相比(bi)之下，數字(zi)量信(xin)號不受這些(xie)因(yin)素的(de)影響，根據輸(shu)出(chu)(chu)的(de)電(dian)(dian)壓或電(dian)(dian)流值是否超過設(she)定(ding)門(men)檻，輸(shu)出(chu)(chu)0或1的(de)數字(zi)信(xin)號更加穩(wen)定(ding)、準(zhun)(zhun)確(que)，且易于(yu)(yu)處理和(he)傳輸(shu)，因(yin)此光(guang)電(dian)(dian)開(kai)關通(tong)常輸(shu)出(chu)(chu)數字(zi)量信(xin)號。

二、光電開關是直流還是交流

光電開關(guan)的供(gong)電可以(yi)是直(zhi)流(liu)也(ye)可以(yi)是交流(liu)。

光電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)的(de)供電(dian)(dian)(dian)(dian)(dian)種類(lei)包括直(zhi)流(liu)(liu)式、交(jiao)流(liu)(liu)式和(he)直(zhi)流(liu)(liu)交(jiao)流(liu)(liu)混(hun)合(he)式三種。直(zhi)流(liu)(liu)式光電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)采(cai)用直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)供電(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)壓(ya)范(fan)圍(wei)一(yi)般為(wei)12-24V（10-30V）的(de)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)。交(jiao)流(liu)(liu)式光電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)則采(cai)用交(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)供電(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)壓(ya)范(fan)圍(wei)為(wei)90-240V交(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)，適用于110VAC與220VAC場合(he)的(de)供電(dian)(dian)(dian)(dian)(dian)。而(er)直(zhi)流(liu)(liu)交(jiao)流(liu)(liu)混(hun)合(he)式光電(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)則允(yun)許(xu)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)與交(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)都可以直(zhi)接接入同一(yi)個供電(dian)(dian)(dian)(dian)(dian)回路，直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)范(fan)圍(wei)為(wei)12-240V，交(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)范(fan)圍(wei)為(wei)24-240V，這(zhe)種形式具有較高的(de)適應(ying)性，不(bu)需要考慮配電(dian)(dian)(dian)(dian)(dian)的(de)問題。

因此，光電開關(guan)的供電方式既可(ke)以(yi)是直(zhi)流(liu)也(ye)可(ke)以(yi)是交流(liu)，具(ju)體取決于其設(she)計時所采用(yong)的供電形式。

三、光電開關是有源還是無源

光電開(kai)關既有有源(yuan)型(xing)，也有無源(yuan)型(xing)。

1、有源型光電開關：需(xu)要(yao)另(ling)外提(ti)供(gong)一個電源或(huo)信號源才能驅動它的工作。例如(ru)，光電耦合器、光電轉換器等。

2、無源型光電開關：不(bu)需要外部(bu)電源或信號(hao)源，它可(ke)以直接(jie)將光(guang)信號(hao)轉換成電信號(hao)輸(shu)出。例如，光(guang)電二極管、光(guang)敏(min)三極管等(deng)。

需(xu)要注意的(de)是，無源型(xing)光(guang)電開(kai)關需(xu)要有較高的(de)光(guang)照強度才(cai)能(neng)工作，因(yin)此其(qi)檢(jian)測距離(li)一般(ban)比有源型(xing)的(de)短。