像增强型CCD成像系统的分辨力分析

Analysis of the Resolving Power of ICCD System

分辨力和信噪比是像增强型CCD成像系统的两个最主要的参量.为了分析CCD相机分辨力对像增强型CCD成像系统分辨力的影响,本文分别用一个高分辨力像增强型CCD相机和一个普通分辨力CCD相机分别与相同的中继透镜、像增强器和前置镜头耦合,得到一套高分辨力像增强型CCD实验样机和一套对比像增强型CCD实验样机;在不同照度下测量了两套实验样机的分辨力和信噪比,实验结果分析表明:当照度高于1.84×10-3 lx时,像增强型CCD成像系统分辨力受器件分辨力和信噪比共同影响,高分辨力像增强型CCD实验样机分辨力要高于对比像增强型CCD实验样机分辨力.当照度低于1.84×10-3 lx时,像增强型CCD成像系统分辨力主要受器件信噪比的影响,高分辨力像增强型CCD实验样机与对比像增强型CCD实验样机分辨力相当.

Resolving power and signal to noise ratio are two key indicators of ICCD system.In order to analyze the influence of resolving power of ICCD,a high resolving power ICCD sample machine and a comparing ICCD sample machine were assembled.The resolving power and signal to noise ratio of two ICCD sample machines were measured in different illumination.The experimental result shows: when the illumination is above 1.84×10-3 lx,the resolving power of the ICCD system is under the influence of resolving power and signal to noise ratio of devices.The resolving power of high resolving power ICCD sample machine is higher than the comparing ICCD sample machine′s.When the illumination is below 1.84×10-3 lx,the resolving power of the ICCD system is under the influence of signal to noise ratio of devices.The resolving powers of two systems are equal.