一、光電開關是模擬量還是數字量
光(guang)電開(kai)關的(de)信號通常為數字量。
由于光(guang)電(dian)開(kai)(kai)關的(de)(de)輸出(chu)信(xin)(xin)號往往只有(you)兩種情況,即有(you)光(guang)和斷(duan)光(guang)。因此,受(shou)(shou)到檢測物體大小、光(guang)源亮(liang)度、反射(she)度等(deng)因素的(de)(de)影響(xiang),無(wu)法保證模擬量(liang)(liang)的(de)(de)穩定(ding)性(xing)和準(zhun)確(que)性(xing)。相(xiang)比之下,數字量(liang)(liang)信(xin)(xin)號不受(shou)(shou)這(zhe)些(xie)因素的(de)(de)影響(xiang),根據輸出(chu)的(de)(de)電(dian)壓或電(dian)流值(zhi)是(shi)否超過設定(ding)門檻,輸出(chu)0或1的(de)(de)數字信(xin)(xin)號更加穩定(ding)、準(zhun)確(que),且易于處理和傳輸,因此光(guang)電(dian)開(kai)(kai)關通常輸出(chu)數字量(liang)(liang)信(xin)(xin)號。
二、光電開關是直流還是交流
光電(dian)開(kai)關的供電(dian)可(ke)(ke)以是直(zhi)流也可(ke)(ke)以是交流。
光電(dian)(dian)(dian)開(kai)關(guan)(guan)的(de)供(gong)(gong)電(dian)(dian)(dian)種(zhong)類(lei)包括直(zhi)流(liu)(liu)式(shi)、交流(liu)(liu)式(shi)和直(zhi)流(liu)(liu)交流(liu)(liu)混合(he)式(shi)三種(zhong)。直(zhi)流(liu)(liu)式(shi)光電(dian)(dian)(dian)開(kai)關(guan)(guan)采(cai)用(yong)直(zhi)流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)(ya)供(gong)(gong)電(dian)(dian)(dian),電(dian)(dian)(dian)壓(ya)(ya)(ya)范(fan)圍(wei)一(yi)般(ban)為(wei)(wei)12-24V(10-30V)的(de)直(zhi)流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)(ya)。交流(liu)(liu)式(shi)光電(dian)(dian)(dian)開(kai)關(guan)(guan)則采(cai)用(yong)交流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)(ya)供(gong)(gong)電(dian)(dian)(dian),電(dian)(dian)(dian)壓(ya)(ya)(ya)范(fan)圍(wei)為(wei)(wei)90-240V交流(liu)(liu)電(dian)(dian)(dian),適用(yong)于110VAC與(yu)220VAC場合(he)的(de)供(gong)(gong)電(dian)(dian)(dian)。而直(zhi)流(liu)(liu)交流(liu)(liu)混合(he)式(shi)光電(dian)(dian)(dian)開(kai)關(guan)(guan)則允許直(zhi)流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)(ya)與(yu)交流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)(ya)都可(ke)以(yi)直(zhi)接(jie)接(jie)入同一(yi)個(ge)供(gong)(gong)電(dian)(dian)(dian)回路(lu),直(zhi)流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)(ya)范(fan)圍(wei)為(wei)(wei)12-240V,交流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)(ya)范(fan)圍(wei)為(wei)(wei)24-240V,這種(zhong)形式(shi)具有較高的(de)適應性,不需要考慮配電(dian)(dian)(dian)的(de)問題。
因此(ci),光(guang)電開(kai)關的(de)(de)供(gong)電方式(shi)既可以(yi)是(shi)直流(liu)也(ye)可以(yi)是(shi)交流(liu),具(ju)體取決于其(qi)設計時(shi)所采用的(de)(de)供(gong)電形式(shi)。
三、光電開關是有源還是無源
光電開關既有(you)有(you)源(yuan)型(xing),也有(you)無源(yuan)型(xing)。
1、有源型光電開關:需要另外提供一個電源(yuan)或信(xin)號源(yuan)才能驅動它的工作。例(li)如,光電耦(ou)合器、光電轉(zhuan)換(huan)器等(deng)。
2、無源型光電開關:不需要外部電(dian)源或信號(hao)源,它(ta)可以直接將光(guang)信號(hao)轉換成(cheng)電(dian)信號(hao)輸出。例如,光(guang)電(dian)二極(ji)管(guan)、光(guang)敏三(san)極(ji)管(guan)等。
需要(yao)注意的(de)是,無源(yuan)型光電(dian)開關需要(yao)有較(jiao)高(gao)的(de)光照(zhao)強度(du)才(cai)能工作,因此其(qi)檢測距離一般比有源(yuan)型的(de)短(duan)。