PE空心陰極燈

發光原理

      空(kong)心陰(yin)(yin)極(ji)燈（hollow cathode lamp,HCL）是一種特(te)殊形式的(de)低(di)壓(ya)氣(qi)(qi)(qi)體放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)光(guang)源(yuan)，放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)集中(zhong)于陰(yin)(yin)極(ji)空(kong)腔內。當在兩極(ji)之(zhi)間施加200V-500V電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)時(shi)(shi)，便產生輝光(guang)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)。在電(dian)(dian)(dian)(dian)(dian)(dian)場作用下，電(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)在飛向陽極(ji)的(de)途(tu)中(zhong)，與載(zai)氣(qi)(qi)(qi)原(yuan)(yuan)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)碰撞并使之(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)離(li)(li)，放(fang)出(chu)二(er)次電(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)，使電(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)與正離(li)(li)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)數目(mu)增加，以(yi)維持放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)。正離(li)(li)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)從電(dian)(dian)(dian)(dian)(dian)(dian)場獲(huo)得動(dong)能(neng)(neng)。如(ru)果正離(li)(li)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)的(de)動(dong)能(neng)(neng)足以(yi)克(ke)服金屬陰(yin)(yin)極(ji)表(biao)面的(de)晶(jing)(jing)格(ge)能(neng)(neng)，當其撞擊在陰(yin)(yin)極(ji)表(biao)面時(shi)(shi)，就可(ke)以(yi)將原(yuan)(yuan)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)從晶(jing)(jing)格(ge)中(zhong)濺(jian)射(she)出(chu)來(lai)。除濺(jian)射(she)作用之(zhi)外，陰(yin)(yin)極(ji)受(shou)熱也(ye)要導致(zhi)陰(yin)(yin)極(ji)表(biao)面元(yuan)(yuan)素的(de)熱蒸(zheng)發(fa)。濺(jian)射(she)與蒸(zheng)發(fa)出(chu)來(lai)的(de)原(yuan)(yuan)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)進入空(kong)腔內，再(zai)與電(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)、原(yuan)(yuan)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)、離(li)(li)子(zi)(zi)(zi)(zi)(zi)(zi)(zi)等發(fa)生第二(er)類碰撞而(er)受(shou)到(dao)激發(fa)，發(fa)射(she)出(chu)相應(ying)元(yuan)(yuan)素的(de)特(te)征的(de)共振輻射(she)。與此同(tong)時(shi)(shi)，HCL所發(fa)射(she)的(de)譜線中(zhong)還包(bao)含了(le)內充氣(qi)(qi)(qi)、陰(yin)(yin)極(ji)材料和雜質元(yuan)(yuan)素等譜線。

       因為(wei)燈內(nei)填充氣(qi)體(ti)(ti)壓(ya)力低(di)，壓(ya)力變(bian)(bian)寬很小(xiao)；陰極溫度(du)較(jiao)低(di)，熱變(bian)(bian)寬也很小(xiao)；同時，因為(wei)氣(qi)體(ti)(ti)密度(du)低(di)，自吸變(bian)(bian)寬也不存在。HCL基本滿足發射譜(pu)線(xian)的(de)半寬度(du)窄、譜(pu)線(xian)強度(du)大(da)且(qie)穩定、譜(pu)線(xian)背景小(xiao)、操作方便和(he)經久耐用等銳線(xian)光(guang)源(yuan)的(de)基本要求。并且(qie)，當采用較(jiao)大(da)的(de)燈電(dian)流時，HCL所發射譜(pu)線(xian)半寬度(du)變(bian)(bian)寬和(he)譜(pu)線(xian)強度(du)增(zeng)高，此時檢測器的(de)負高壓(ya)降低(di)，吸光(guang)度(du)讀數穩定。

PE空心陰極燈

特(te)點

      用于原(yuan)子吸收的配套光源，具有譜線(xian)發射能量(liang)強、吸收靈敏度高、穩定(ding)性好、壽命長(chang)（大部分元素都(dou)可達到5000mAh,低(di)熔點元素可達3000mAh）、低(di)噪聲(sheng)、低(di)漂(piao)移等特性。

       起輝電(dian)壓≤360V，基(ji)線(xian)漂移(yi)：預(yu)熱30min 在30min內≤1%，分析(xi)線(xian)背景≤1%，主分析(xi)線(xian)：發射強度(du)波動噪聲＜0.1%。能夠很好(hao)的匹配(pei)于國內外各品牌原(yuan)子吸收(shou)光譜儀(yi)。

PE空心陰極燈   

使用注意(yi)事項(xiang)

①注意極性不(bu)能接反。

②為了(le)使燈(deng)發光強(qiang)度穩定，在工作電(dian)流下(xia)預熱10-30min。

③燈(deng)長期不用(yong)，應定期點燃，一般在工作電(dian)流下預熱1h。

④長(chang)期擱置，燈內有雜(za)質存(cun)在，可以采用(yong)反接去氣法。，顛倒電極用(yong)大電流(liu)點燈30min.