基于大面阵CCD的复消色差航空相机物镜设计

为了满足航空相机物镜结构简单及高分辨率的要求,提出了一种基于波差法校正长焦距、宽波段的大面阵CCD航空相机物镜二级光谱的方法.介绍了二级光谱的基本原理,给出了波差法设计复消色差物镜的方程组.采用普通光学材料设计了复消色差航空相机物镜,系统焦距为400 mm,相对孔径为F/4,工作波段为420～850 nm.给出了光学系统图、纵向像差图及调制传递函数图.设计结果表明,采用该方法设计的航空相机物镜在60 lp/mm处各视场传递函数均在0.75以上,满足接收器件有效尺寸为36 mm×48 mm的大面阵CCD成像要求.

Design of Apochromatism Objective Lens of Aerial Camera Based on Large Frame Array CCD

To meet the requirement for simple structure and high-resolution, a method for correcting secondary spectrum of large frame array CCD aerial camera's objective lens with long focal length and wide band based on wave aberration method is proposed. The principle of secondary spectrum is introduced and the equations of designing apochromatism objective lens based on wave aberration are presented. The apochromatism objective lens of aerial camera is designed by common optical materials. Objective' focal length is 400 mm, relative aperture is F/4,and work waveband is 420～850 nm. The figures of optical system, longitudinal aberration and modulation transfer function (MTF) are given. Designing results show that the MTF of every field above 0.75 in 60 lp/mm, and satisfy the requirements of imaging for large frame array CCD whose effective size is 36 mm× 48 mm.