一、光電開關的L和D代表什么
有些光電開關上,有撥碼開關,D和L,分別是dark和light的縮寫,表示暗和亮的意思。表示光電開關的動作(zuo)條件(jian)(jian)。光(guang)(guang)電(dian)(dian)(dian)(dian)開(kai)(kai)光(guang)(guang)會(hui)發射一束光(guang)(guang),如(ru)果碰到障礙物(wu),光(guang)(guang)會(hui)反(fan)射,然后光(guang)(guang)電(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)(guan)就會(hui)接(jie)(jie)(jie)收到這束光(guang)(guang)。如(ru)果撥(bo)碼撥(bo)到L,表示明亮,也就是光(guang)(guang)電(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)(guan)接(jie)(jie)(jie)收到光(guang)(guang)才會(hui)有(you)(you)輸(shu)(shu)出。如(ru)果沒有(you)(you)工(gong)(gong)件(jian)(jian),光(guang)(guang)電(dian)(dian)(dian)(dian)不(bu)會(hui)接(jie)(jie)(jie)收到反(fan)射光(guang)(guang)束,因此不(bu)會(hui)有(you)(you)輸(shu)(shu)出。如(ru)果撥(bo)碼撥(bo)到D,表示黑暗,沒有(you)(you)工(gong)(gong)件(jian)(jian),光(guang)(guang)電(dian)(dian)(dian)(dian)不(bu)會(hui)接(jie)(jie)(jie)收到反(fan)射光(guang)(guang)束,因此會(hui)有(you)(you)輸(shu)(shu)出。而此時,一旦有(you)(you)工(gong)(gong)件(jian)(jian),那么(me)光(guang)(guang)電(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)(guan)就接(jie)(jie)(jie)受到光(guang)(guang)線,就會(hui)關(guan)(guan)斷輸(shu)(shu)出。
所以,L和D其實就是常開和常閉(bi)的意思(si),L表(biao)(biao)示(shi)有(you)(you)光(guang)線的時候有(you)(you)輸出,D表(biao)(biao)示(shi)沒有(you)(you)光(guang)線的時候有(you)(you)輸出。
二、光電開關的電氣符號介紹
光(guang)電開關的電氣符號(hao)(hao)包括文字(zi)符號(hao)(hao)和標準(zhun)符號(hao)(hao)。文字(zi)符號(hao)(hao)通常(chang)(chang)為一個(ge)正(zheng)(zheng)方形(xing)(xing),里面包含一個(ge)三(san)角形(xing)(xing)和圓形(xing)(xing),其中圓形(xing)(xing)象征著電源,三(san)角形(xing)(xing)代表(biao)光(guang)電傳(chuan)感(gan)器(qi)的元(yuan)件體,正(zheng)(zheng)方形(xing)(xing)中間用線條表(biao)示(shi)出開關的操(cao)作桿或按鍵(jian)。標準(zhun)符號(hao)(hao)由三(san)部分組(zu)成,基本元(yuan)件是一邊(bian)懸空的光(guang)敏二極管管腳(jiao)和一對正(zheng)(zheng)常(chang)(chang)開合的瞬(shun)時觸點。一個(ge)箭(jian)頭指向一個(ge)實體圓形(xing)(xing)表(biao)示(shi)發射系(xi)統,另一個(ge)箭(jian)頭指向一個(ge)虛線圓圈(quan)表(biao)示(shi)接收系(xi)統。
接(jie)近開關(guan)也(ye)稱為光電(dian)開關(guan),其圖形(xing)符(fu)號和文字(zi)符(fu)號在電(dian)路圖中有所表(biao)示,例(li)如,接(jie)近開關(guan)的圖形(xing)符(fu)號可能是一個帶有箭頭的實線長方(fang)形(xing),箭頭指(zhi)向發射(she)器的方(fang)向,而(er)文字(zi)符(fu)號可能使(shi)用“SQ”來表(biao)示。
在設計和構建光電開關相關的電路(lu)(lu)時(shi),理解和使用這些電氣(qi)符號是(shi)非常重要的,它們能夠(gou)幫助讀者(zhe)根據自己(ji)的需要方便(bian)地設計和構建電路(lu)(lu)。