Calculation and Selection of Camera Lens for Video Monitoring System

Duan Hua（The Second Academy of China Aerospace Science & Industry Corp.，Beijing 100854，China）

    Abstract This paper introduces the relations between illuminance of the camera in video monitoring system and the environment as well as the lens aperture，type，specification and the size of camera lens，the selection of camera lens and site setting. It also analyzes and states the formulas for finding the field of view，angle of view and focal distance of camera as well as that for finding the maximum lens aperture.

Key words　Field of view　Focal distance　Camera lens CCD　Maximum lens aperture

 

 

    摘　要　介绍视频监控系统摄像机照度与环境、镜头光圈的关系，镜头的种类、规格尺寸，镜头的选择与设置场所，并对摄像机视场、视场角、焦距计算和镜头最大光圈的计算公式进行分析阐述。

    关键词　视场　焦距　摄像机镜头　CCD　最大光圈