一、光電式接近開關原理是什么

原理：在光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)耦(ou)合器(qi)(qi)輸(shu)(shu)入端加(jia)電(dian)(dian)(dian)(dian)信號使發光(guang)(guang)(guang)(guang)(guang)源發光(guang)(guang)(guang)(guang)(guang)，光(guang)(guang)(guang)(guang)(guang)的(de)強(qiang)度(du)取決(jue)于激(ji)勵電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)大(da)小(xiao)，此光(guang)(guang)(guang)(guang)(guang)照射到(dao)封裝在一(yi)起(qi)的(de)受光(guang)(guang)(guang)(guang)(guang)器(qi)(qi)上后，因光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)效應而產生了(le)光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)流(liu)(liu)，由(you)受光(guang)(guang)(guang)(guang)(guang)器(qi)(qi)輸(shu)(shu)出端引出，這樣就實現了(le)電(dian)(dian)(dian)(dian)一(yi)光(guang)(guang)(guang)(guang)(guang)一(yi)電(dian)(dian)(dian)(dian)的(de)轉換。

由振蕩回(hui)路產生的(de)調(diao)(diao)制脈沖(chong)經(jing)反射電(dian)(dian)路后，由發光(guang)(guang)(guang)管GL輻射出光(guang)(guang)(guang)脈沖(chong)。當(dang)被測物體進入(ru)(ru)受光(guang)(guang)(guang)器(qi)作用范圍時，被反射回(hui)來的(de)光(guang)(guang)(guang)脈沖(chong)進入(ru)(ru)光(guang)(guang)(guang)敏三(san)極(ji)管DU。光(guang)(guang)(guang)電(dian)(dian)開關并(bing)在接收電(dian)(dian)路中將光(guang)(guang)(guang)脈沖(chong)解調(diao)(diao)為(wei)電(dian)(dian)脈沖(chong)信號，再經(jing)放大(da)器(qi)放大(da)和同步選通整形(xing)，然后用數(shu)字積分(fen)或RC積分(fen)方式排(pai)除干擾，最(zui)后經(jing)延時（或不延時）觸(chu)發驅(qu)動器(qi)輸出光(guang)(guang)(guang)電(dian)(dian)開關控制信號。

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光電開(kai)關一(yi)般都具有良好的回差特性(xing)，因而即使被檢測物在(zai)小范圍內晃動(dong)也不會影響驅動(dong)器(qi)的輸出狀(zhuang)(zhuang)態(tai)，從(cong)而可使其(qi)保持在(zai)穩定工作區。同(tong)時，自診斷系統還(huan)可以顯示受(shou)光狀(zhuang)(zhuang)態(tai)和穩定工作區，以隨時監視光電開(kai)關的工作。

這種(zhong)(zhong)新穎(ying)的光(guang)電(dian)開關是一種(zhong)(zhong)采用脈沖調制(zhi)的主動式光(guang)電(dian)探測系統型電(dian)子開關，它所使用的冷光(guang)源有紅(hong)外(wai)光(guang)、紅(hong)色光(guang)、綠色光(guang)和(he)藍色光(guang)等，可非接觸，無損傷(shang)地迅速(su)和(he)控制(zhi)各種(zhong)(zhong)固體、液體、透明體、黑(hei)體、柔(rou)軟(ruan)體和(he)煙(yan)霧等物質的狀態和(he)動作。具(ju)有體積小、功能(neng)多、壽命長、精度高(gao)、響應速(su)度快(kuai)、檢測距離(li)遠以(yi)及抗光(guang)、電(dian)、磁干(gan)擾能(neng)力強的優點。

二、光電式接近開關的應用場合有哪些

光電開關已被(bei)用(yong)作物位檢(jian)測(ce)、液位控制、產品計數、寬度(du)判別、速度(du)檢(jian)測(ce)、定(ding)長(chang)剪切(qie)、孔(kong)洞識(shi)別、信號延時、自(zi)動門傳感(gan)、色標檢(jian)出、沖床和剪切(qie)機(ji)以及安全防護等諸多領域。此外(wai)(wai)，利用(yong)紅外(wai)(wai)線的隱蔽性(xing)，還(huan)可在銀行、倉(cang)庫、商店、辦公(gong)室以及其它(ta)需要的場合作為防盜警戒之用(yong)。