铝镓氮光电阴极日盲紫外像增强器辐射增益研究  

Radiation Gain of AlGaN Photocathode Solar Blind UV Image Intensifier

作　　者：程宏昌 石峰 姚泽 闫磊 杨书宁 CHENG Hongchang;SHI Feng;YAO Ze;YAN Lei;YANG Shuning(Science and Technology on Low-Light-Level Night Vision Laboratory,Xi’an 710065,China;Kunming Institute of Physics,Kunming 650223,China)

机构地区：[1]微光夜视技术重点实验室,陕西西安710065 [2]昆明物理研究所,云南昆明651505

出　　处：《红外技术》2020年第8期709-714,共6页Infrared Technology

摘　　要：铝镓氮光电阴极日盲紫外像增强器以日盲特性优、探测灵敏度高等特点,已被广泛应用于日盲紫外探测系统中,辐射增益是表征其增强功能的重要指标之一。本文针对铝镓氮光电阴极日盲紫外像增强器辐射增益数学模型及测试方法缺乏问题,采用在微光像增强器亮度增益数学模型基础上,对光电阴极引入入射辐射照度,对荧光屏引入视见函数这两个量值,推导出了有效直径为Ф18 mm的双近贴聚焦铝镓氮光电阴极紫外像增强器辐射增益(λ=254 nm)的数学模型,采用实验室标准设备对数学模型中光电阴极量子效率、微通道板电流增益、荧光屏发光效率等参数进行了有效测量,将诸参数的测量值带入了辐射增益数学表达式中,计算出了10支铝镓氮光电阴极日盲紫外像增强器样品的辐射增益理论值;同时改造完成了一套紫外像增强器辐射增益测试系统,利用该系统测试了上述10支样品的辐射增益,并对数学理论值与实际测量值进行比较,两者偏差在10%之内,验证了数学模型和测试系统的正确性。本文研究的辐射增益数学模型可指导高辐射增益紫外像增强器技术相关研究。Few studies have presented mathematical models and test methods for determining the radiation gain of AlGaN photocathode solar blind ultraviolet image intensifiers;thus,in this study,a mathematical model of radiation gain of a dual close-focused AlGaN photocathode ultraviolet image intensifier,with an effective diameter ofФ18 mm,is deduced.The mathematical model is based on the brightness gain of low-light-level image intensifiers;two values of incident irradiance are introduced to the photocathode and a visual function to the phosphor screen.The quantum efficiency of the photocathode,MCP(microchannel plate)current gain,and luminous efficiency of the phosphor screen are measured using standard laboratory equipment.The measured values of the parameters are substituted into the mathematical equation of the radiation gain,and the theoretical values of radiation gains of 10 samples are calculated.Additionally,a set of UV radiation gain test systems is modified;the systems are used to test the radiant gain of the aforementioned 10 samples and compare the mathematical theory and the actual measured values.The deviation between the two values is within 10%,and the validity of the mathematical model and test system are proven.The results of this study may serve as a reference for studies regarding high-radiation gain UV image intensifier technology。

关 键 词：铝镓氮光电阴极 紫外像增强器 辐射增益 辐射照度 辐射出射度 

分 类 号：O462.3[理学—电子物理学]