【摘要】 针对真空环境下使用氟化镁窗口氘灯时,氘灯表面易受污染,导致氘灯的紫外-真空紫外辐射强度逐渐衰减的问题,对紫外-真空紫外波段辐射传递标准光源氘灯的真空辐射衰减机理进行了分析。在此基础上,研制了液氮制冷屏装置来抑制氘灯衰减。建立了氘灯真空辐射特性测试系统,利用该系统对液氮制冷屏装置的有效性进行了考察。测试结果显示,在160～300nm波段,氘灯平均衰减率可由原来的7%/h下降为1%/h,表明液氮制冷屏装置能有效地抑制氟化镁窗口氘灯在真空环境下的辐射衰减。更多还原

【Abstract】 When a deuterium lamp with MgF2 window is used as the UV-VUV radiation transfer standard source,the radiation intensity will be gradually degraduted by the window surface pollution of deuterium lamp in vacuum environment.This paper analyzes the vacuum radiation degradation mechanism of the deuterium lamp with MgF2 window. Based on this, a liquid nitrogen cooled screen device is developed to control the radiation degradation of deuterium lamp. Then,an equipment for studying the radiation characteristics of deuterium lamp in vacuum environment is established to analyze the effectiveness of the liquid nitrogen cooled screen device. The experimental results show that the average degradation rate of deuterium lamp decreases from 7%/h to 1%/h in 160~300 nm,which shows that developed liquid nitrogen cooled screen device can very effectively control the radiation degradation of deuterium lamp with MgF2 window in vacuum environment.更多还原