普(pu)通型空(kong)心陰極燈(deng)

使用注意事項

①注意極性不能(neng)接反。

②為了使燈發(fa)光強度穩定，在(zai)工作電流下預(yu)熱10-30min。

③燈長期不用，應定期點燃，一般在工作電流(liu)下預熱1h。

④長期擱(ge)置(zhi)，燈內有雜質存在，可以采(cai)用反接(jie)去(qu)氣法(fa)。，顛倒(dao)電(dian)極(ji)用大電(dian)流(liu)點燈30min.　

普通型空心陰極燈

特點(dian)

    本YYD空心陰極燈用(yong)于原子(zi)吸收(shou)的配套光源，具有譜線發射能(neng)量強、吸收(shou)靈(ling)敏度高(gao)、穩定性好、壽命長（大部分元(yuan)素(su)都可(ke)達(da)到5000mAh,低熔點元(yuan)素(su)可(ke)達(da)3000mAh）、低噪聲、低漂移等特性。

    起輝電壓(ya)≤360V，基(ji)線(xian)(xian)漂移：預熱30min 在30min內(nei)≤1%，分析線(xian)(xian)背景≤1%，主分析線(xian)(xian)：發射強度波動噪聲＜0.1%。能夠很好的匹配于國內(nei)外各品(pin)牌原子吸收光譜儀。

普通型空心陰極燈

發光原理

      空心陰極(ji)燈（hollow cathode lamp,HCL）是(shi)一種特殊形式(shi)的(de)(de)(de)低壓氣體放電(dian)(dian)(dian)(dian)光源，放電(dian)(dian)(dian)(dian)集(ji)中于陰極(ji)空腔(qiang)內(nei)(nei)。當(dang)在(zai)(zai)兩極(ji)之(zhi)間(jian)施加(jia)200V-500V電(dian)(dian)(dian)(dian)壓時(shi)，便產(chan)生輝光放電(dian)(dian)(dian)(dian)。在(zai)(zai)電(dian)(dian)(dian)(dian)場作用下，電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)在(zai)(zai)飛向陽極(ji)的(de)(de)(de)途中，與載氣原(yuan)子(zi)(zi)(zi)(zi)碰(peng)撞并使之(zhi)電(dian)(dian)(dian)(dian)離(li)，放出(chu)二次電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)，使電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)與正離(li)子(zi)(zi)(zi)(zi)數(shu)目增加(jia)，以(yi)維持放電(dian)(dian)(dian)(dian)。正離(li)子(zi)(zi)(zi)(zi)從電(dian)(dian)(dian)(dian)場獲(huo)得動(dong)能(neng)。如果正離(li)子(zi)(zi)(zi)(zi)的(de)(de)(de)動(dong)能(neng)足(zu)以(yi)克服金屬(shu)陰極(ji)表面(mian)的(de)(de)(de)晶(jing)格能(neng)，當(dang)其撞擊在(zai)(zai)陰極(ji)表面(mian)時(shi)，就可以(yi)將(jiang)原(yuan)子(zi)(zi)(zi)(zi)從晶(jing)格中濺(jian)(jian)射(she)(she)出(chu)來。除濺(jian)(jian)射(she)(she)作用之(zhi)外，陰極(ji)受熱(re)(re)也要導(dao)致陰極(ji)表面(mian)元(yuan)(yuan)素的(de)(de)(de)熱(re)(re)蒸發(fa)。濺(jian)(jian)射(she)(she)與蒸發(fa)出(chu)來的(de)(de)(de)原(yuan)子(zi)(zi)(zi)(zi)進入(ru)空腔(qiang)內(nei)(nei)，再與電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)、原(yuan)子(zi)(zi)(zi)(zi)、離(li)子(zi)(zi)(zi)(zi)等發(fa)生第二類碰(peng)撞而受到(dao)激(ji)發(fa)，發(fa)射(she)(she)出(chu)相(xiang)應元(yuan)(yuan)素的(de)(de)(de)特征的(de)(de)(de)共振輻射(she)(she)。與此同時(shi)，HCL所發(fa)射(she)(she)的(de)(de)(de)譜線中還包(bao)含了內(nei)(nei)充氣、陰極(ji)材料和雜質元(yuan)(yuan)素等譜線。

       因為燈內填充(chong)氣體(ti)壓力低，壓力變(bian)(bian)(bian)寬很小；陰極溫度(du)較低，熱變(bian)(bian)(bian)寬也很小；同時，因為氣體(ti)密度(du)低，自吸變(bian)(bian)(bian)寬也不存在。HCL基本滿足(zu)發射譜線(xian)(xian)(xian)的(de)(de)半寬度(du)窄、譜線(xian)(xian)(xian)強(qiang)(qiang)度(du)大且穩定(ding)、譜線(xian)(xian)(xian)背景小、操作方便(bian)和經久耐(nai)用(yong)等銳線(xian)(xian)(xian)光源的(de)(de)基本要求。并且，當采用(yong)較大的(de)(de)燈電(dian)流(liu)時，HCL所(suo)發射譜線(xian)(xian)(xian)半寬度(du)變(bian)(bian)(bian)寬和譜線(xian)(xian)(xian)強(qiang)(qiang)度(du)增高(gao)，此(ci)時檢測(ce)器的(de)(de)負高(gao)壓降(jiang)低，吸光度(du)讀(du)數穩定(ding)。