单传感器全景与长焦组合光学系统设计

Design of Combination of Panoramic and Long Focal Length Optical System with Single Sensor

提出了一种基于全景环带透镜(PAL)的全景与长焦组合成像系统设计方法。该系统由沿光轴放置的反光镜单元、长焦单元与PAL单元组成。长焦单元通过二次成像的方式与PAL单元成像于同一传感器上,其像面利用了PAL单元中央的盲区。反光镜单元可绕光轴旋转与俯仰摆动,能将全景环带像面上的任意物点放大10倍。该系统在实现360°全景探测的同时还能将重点区域实时放大,且只使用单一光学系统与传感器,弥补了PAL单元的盲区。此外该系统还可计算环带视场中物点与光学系统的距离。系统总长约300mm,最大口径为160mm,PAL单元视场角为360°×(30°～100°),长焦单元视场角为±3°,两单元全视场在100lp/mm处的调制传递函数(MTF)值均高于0.55。

A novel combination of panoramic and long focal length optical system with single sensor based on panoramic annular lens （PAL） is introduced. The proposed system consists of rotating mirror unit, coaxial long focal length unit and PAL unit. The long focal length unit images on the imaging plane of PAL unit by secondary imaging using the blind area of PAL unit＇s imaging plane. A mirror is above the long focal length unit which can rotate round about the optical axis and horizontal axis. The object in the ring imaging plane can be amplified 10 times. This system can get panoramic image and amplify image at the same time with the same sensor. The pixels in the inevitable blind area are used. Besides, the distance of the object in the ring imaging can be calculated. The system＇s length is about 300 mm and diameter is 160 mm. The field of PAL unit is 360°×（30°～100°）. The field of the long focal length unit is ±3°. The modulation transfer function （MTF） of both units is higher than 0.55 at 100 lp/mm in all fields.