一、光電開關是模擬量還是數字量
光電(dian)開(kai)關的信(xin)號通常為數字量。
由(you)于光電(dian)開關的(de)(de)輸出信(xin)號(hao)往往只(zhi)有(you)兩種(zhong)情況,即有(you)光和斷光。因(yin)此,受(shou)到檢測物體大小(xiao)、光源亮度、反射度等因(yin)素(su)的(de)(de)影響,無法(fa)保證模擬量(liang)的(de)(de)穩(wen)定(ding)性(xing)和準確性(xing)。相比之下,數字(zi)量(liang)信(xin)號(hao)不(bu)受(shou)這(zhe)些因(yin)素(su)的(de)(de)影響,根據輸出的(de)(de)電(dian)壓或電(dian)流值(zhi)是否超過設(she)定(ding)門檻(jian),輸出0或1的(de)(de)數字(zi)信(xin)號(hao)更加穩(wen)定(ding)、準確,且易于處理(li)和傳(chuan)輸,因(yin)此光電(dian)開關通常(chang)輸出數字(zi)量(liang)信(xin)號(hao)。
二、光電開關是直流還是交流
光電(dian)開關的供(gong)電(dian)可以是直流(liu)也可以是交流(liu)。
光(guang)電(dian)(dian)(dian)(dian)開關的(de)供(gong)電(dian)(dian)(dian)(dian)種(zhong)(zhong)類(lei)包括直流(liu)(liu)(liu)式、交流(liu)(liu)(liu)式和直流(liu)(liu)(liu)交流(liu)(liu)(liu)混合式三種(zhong)(zhong)。直流(liu)(liu)(liu)式光(guang)電(dian)(dian)(dian)(dian)開關采(cai)用直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)供(gong)電(dian)(dian)(dian)(dian),電(dian)(dian)(dian)(dian)壓(ya)范圍一般為(wei)12-24V(10-30V)的(de)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)。交流(liu)(liu)(liu)式光(guang)電(dian)(dian)(dian)(dian)開關則采(cai)用交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)供(gong)電(dian)(dian)(dian)(dian),電(dian)(dian)(dian)(dian)壓(ya)范圍為(wei)90-240V交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian),適用于(yu)110VAC與220VAC場合的(de)供(gong)電(dian)(dian)(dian)(dian)。而直流(liu)(liu)(liu)交流(liu)(liu)(liu)混合式光(guang)電(dian)(dian)(dian)(dian)開關則允(yun)許直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)與交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)都可以直接(jie)接(jie)入同一個(ge)供(gong)電(dian)(dian)(dian)(dian)回(hui)路,直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)范圍為(wei)12-240V,交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)范圍為(wei)24-240V,這(zhe)種(zhong)(zhong)形式具有較(jiao)高的(de)適應性,不(bu)需(xu)要考(kao)慮(lv)配電(dian)(dian)(dian)(dian)的(de)問題(ti)。
因(yin)此,光電(dian)開關的(de)供電(dian)方式既可以是(shi)直流也可以是(shi)交流,具體取決于其設計時所采(cai)用的(de)供電(dian)形(xing)式。
三、光電開關是有源還是無源
光電開(kai)關既有有源(yuan)(yuan)型,也有無源(yuan)(yuan)型。
1、有源型光電開關:需要(yao)另外提供一個(ge)電源(yuan)或信號源(yuan)才能(neng)驅(qu)動(dong)它的(de)工作。例如,光(guang)電耦合器、光(guang)電轉換器等(deng)。
2、無源型光電開關:不需要外(wai)部(bu)電源或信(xin)(xin)號(hao)(hao)源,它可以直接將光(guang)信(xin)(xin)號(hao)(hao)轉換成電信(xin)(xin)號(hao)(hao)輸(shu)出。例如(ru),光(guang)電二(er)極(ji)管(guan)(guan)、光(guang)敏三(san)極(ji)管(guan)(guan)等。
需要(yao)注意(yi)的(de)是(shi),無(wu)源型光(guang)電開關需要(yao)有(you)較高的(de)光(guang)照強(qiang)度(du)才能工作,因(yin)此(ci)其檢測距(ju)離一般(ban)比(bi)有(you)源型的(de)短。