针对铝镓氮光阴极像增强器极限分辨力远小于同结构类型砷化镓光阴极像增强器极限分辨力的问题，基于紫外光激发荧光粉发光的特性，搭建了铝镓氮光阴极的紫外光传输特性评测装置，对铝镓氮光阴极紫外光传输特性进行了测量，并依据非衍射光学系统传函方程推算了铝镓氮光阴极的紫外光学传递函数；依据近贴聚焦系统调制传递函数方程，并基于制备的铝镓氮光阴极像增强器的分辨力测试数据，推导了铝镓氮光阴极像增强器的前近贴聚焦系统调制传递函数方程；通过对比研究铝镓氮光阴极的紫外光调制传递函数方程和铝镓氮光阴极像增强管的前近贴聚焦系统调制传递函数方程对系统传函影响的比例权重，提出紫外光在铝镓氮光阴极内部传输时紫外光散射，以及紫外光激发载流子在铝镓氮激活层中的散射和发射电子散射均是造成铝镓氮光阴极像增强管极限分辨力低的因素，且紫外光激发载流子在铝镓氮激活层中的散射和发射电子散射是最主要的影响因素。

The limiting resolution of an AlGaN photocathode image intensifier tube is much less than the limiting resolution of a GaAs photocathode image intensifier tube; thus, based on the effect of ultraviolet fluorescence, we calculate the limit resolution of an AlGaN photocathode and promote its ultraviolet modulation transfer function. According to the proximity focus system modulation transfer function and the test result of the custom developed AlGaN photocathode image intensifier, the resolution model of the AlGaN photocathode image intensifier is established. By comparing the ultraviolet modulation transfer function with the proximity focus system modulation transfer function, we discovered that the ultraviolet and photoelectron transmission in an AlGaN photocathode can reduce the limiting resolution of the AlGaN photocathode image intensifier tube and that the main reason affecting the limiting resolution of the AlGaN photocathode image intensifier tube is the photoelectron transmission and the scatter in the AlGaN photocathode.