一、前言为了弄清物镜孔径、焦距以及相对孔径对直视微光夜视系统探测能力的影响,不得不简要地叙述一下有关的基本原理。在微光下,通过直视微光夜视系统进行观察,其探测能力由夜天光—景物—象增强器系统—人眼这样一个视觉链决定。每一个环节都影响着最终的探测能力。人眼是这个链的终端接收器,整个视觉链的探测能力取决于在何种程度上满足人眼的需要。在这个 I. INTRODUCTION In order to understand the influence of the objective aperture, the focal length and the relative aperture on the detection capability of the direct-view glimmer night vision system, we have to briefly describe the relevant basic principles. In the low light, through the direct vision glimmer night vision system for observation, its detection ability by night sky - scene - image intensifier system - the human eye such a visual chain decision. Each link affects the ultimate detection capability. The human eye is the terminal receiver of the chain, and the ability to detect the entire visual chain depends on the extent to which the human eye needs it. at this