紫外像增强器辐射增益测试系统设计

Testing system of radiation gain in UV image intensifiers

针对辐射增益是紫外像增强器的主要性能参数,决定着紫外像增强器的综合性能,提出一种用于测试紫外像增强器辐射增益的测试仪,测试波长范围为200nm^400nm,亮度测量视场角可选(1/8)°、(1/4)°、(1/2)°、1°、2°、3°。通过改变微通道板电压、阴极电压和荧光屏电压等参数,完成对紫外像增强器的辐射增益测试,测试结果表明:测试曲线变化趋势和紫外像增强器的工作特性相吻合,入射紫外辐射强度调节范围为10-11 W/cm2~10-7 W/cm2,辐射计最低探测强度可达10-11 W/cm2,最低亮度探测阈值可达3×10-4cd/m2,辐射增益测试重复性优于±8%。

Radiation gain acting as the main performance parameter of the ultraviolet(UV)image intensifier determines the comprehensive performance of it,so a test intensifier was designed to measure the radiation gain in UV image intensifier,whose test range was 200nm^400nm,and there were 6(1/8°,1/4°,1/2°,1°,2°and 3°)fields of view(FOVs)for choice.Referring to the image intensifier brightness gain measurement device,the testing system of radiation gain in UV image intensifier was designed.Based on the testing principle and method,the test software was designed.By changing the voltage of micro channel plate,the cathode voltage and screen voltage,the UV image intensifier was measured.The test results indicate that the test curve changing trend coincides with the operation characteristics of the UV intensifier,the incident UV radiation intensity is 10-7 W/cm2~10-11 W/cm2,the minimum detecting intensity of radiometer was 10-11 W/cm2,the minimum brightness detection threshold is3×10-4cd/m2 and the test repeatability of radiation gain is better than ±8%.