紫外線殺菌燈屬於氣體放電燈，它與照明用的熒光燈（管燈）的放電機理沒什麼區別
，所不同的是它的燈管是用石英玻璃或透紫外玻璃製成,而不是用普通玻璃,燈管內壁也不塗熒光粉。它可以輻射出一定強度的253.7nm波長的紫外線。紫外線殺菌燈也是有壽命的，隨著使用時間的延長
，紫外線的有效輻射會不斷的減弱、殺菌效力會不斷降低，當輻照強度低於70μW/cm2時就必須更換燈管了。由於紫外線的不可見特點和在消毒時對劑量控製的要求

，就必須憑借科學的眼睛――計量手段來對它進行監控。

     對紫外線的計量要使用測量紫外線的專用儀器――ziwaifuzhaoduji，ceshishiziwaidengshuipingfangzhi，jiangziwaifuzhaodujidetanceqifangzaijudengguanzhongxinxiafangchuizhijuliyimichu，tongshipingbizasanguang。weileshajunxiaodudeyouxiaoxing
，meigeyiyuandouyingpeibeiziwaifuzhaoduji，anguojiabiaozhundingqiduiziwaidengjinxingyangedeceshi，tongshi，ziwaifuzhaodujiyeyinggaianzhouqisongdaofadingdejiliangjiandingjigoujinxingjiliangjianding

，yibaozhengxiaodudexiaoguo。

 
   buguanshiyongziwaixianshajundengjinxingshajunxiaodu，haishiduiziwaixianshajundengdeyouxiaoxingjinxingjiance，zaijinxingshangshucaozuoshidouyinggairenzhenfanghu
，tebieshizaifangzhifeidiandezhandouzhongzengdaliangdeshiyongziwaixianshajundengjinxingshajunxiaodu，womengengyaojiabeidezhuyi。buyaorangziwaixianzhijiezhaoshedaopifuheyanjing。boliyanjinghejiaohoudeyifudoukeyidangzhuziwaixian，zaixiajiyaozhuyifangshai
，keyidaifangziwaidetaiyangjinglaifangzhiyangguangzhongdehuomalu、水麵等反光麵折射的紫外線損傷眼睛。