一、光電開關是模擬量還是數字量

光電開關的信號通常為數字量。

由(you)于光(guang)電(dian)開關的(de)輸出(chu)(chu)信(xin)號(hao)往(wang)往(wang)只有兩種情況(kuang)，即有光(guang)和斷(duan)光(guang)。因(yin)此，受到檢(jian)測物體大小、光(guang)源亮度(du)、反(fan)射度(du)等因(yin)素的(de)影響，無法保證模擬量(liang)的(de)穩(wen)定性(xing)和準確性(xing)。相比之下，數字量(liang)信(xin)號(hao)不受這些因(yin)素的(de)影響，根(gen)據輸出(chu)(chu)的(de)電(dian)壓或電(dian)流值是否(fou)超過設定門(men)檻，輸出(chu)(chu)0或1的(de)數字信(xin)號(hao)更加(jia)穩(wen)定、準確，且易于處理和傳輸，因(yin)此光(guang)電(dian)開關通常輸出(chu)(chu)數字量(liang)信(xin)號(hao)。

二、光電開關是直流還是交流

光(guang)電開關的供電可以是直流也(ye)可以是交(jiao)流。

光(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開關的(de)(de)供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)種(zhong)類包括直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)(liu)式(shi)(shi)、交流(liu)(liu)(liu)式(shi)(shi)和直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)(liu)交流(liu)(liu)(liu)混(hun)合式(shi)(shi)三種(zhong)。直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)(liu)式(shi)(shi)光(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開關采(cai)用直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)范(fan)(fan)圍(wei)一(yi)般(ban)為(wei)12-24V（10-30V）的(de)(de)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)。交流(liu)(liu)(liu)式(shi)(shi)光(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開關則(ze)采(cai)用交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)范(fan)(fan)圍(wei)為(wei)90-240V交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，適用于110VAC與220VAC場(chang)合的(de)(de)供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。而直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)(liu)交流(liu)(liu)(liu)混(hun)合式(shi)(shi)光(guang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開關則(ze)允許(xu)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)與交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)都可以直(zhi)(zhi)(zhi)(zhi)接(jie)接(jie)入同(tong)一(yi)個供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)回路(lu)，直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)范(fan)(fan)圍(wei)為(wei)12-240V，交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)范(fan)(fan)圍(wei)為(wei)24-240V，這種(zhong)形式(shi)(shi)具有較高的(de)(de)適應性，不需要考(kao)慮配電(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)問題。

因此，光電(dian)開關的供電(dian)方式(shi)既可以是(shi)直流也可以是(shi)交流，具體取(qu)決于其設計時所采用(yong)的供電(dian)形式(shi)。

三、光電開關是有源還是無源

光(guang)電開關既(ji)有(you)有(you)源型，也有(you)無源型。

1、有源型光電開關：需(xu)要另外提供一(yi)個(ge)電源(yuan)(yuan)或信號源(yuan)(yuan)才能驅(qu)動它的工作。例如，光電耦合器(qi)、光電轉換器(qi)等。

2、無源型光電開關：不需(xu)要外(wai)部(bu)電源或信(xin)號(hao)源，它(ta)可以直接將光信(xin)號(hao)轉換成(cheng)電信(xin)號(hao)輸出(chu)。例如，光電二極管(guan)、光敏三極管(guan)等。

需(xu)要注意的是，無源(yuan)(yuan)型光(guang)電開關(guan)需(xu)要有(you)較高(gao)的光(guang)照強度才(cai)能工作，因此其檢測距(ju)離(li)一般比有(you)源(yuan)(yuan)型的短(duan)。