多角度耦合分幅相机光学系统设计

为实现高速相机的分幅功能,本文提出一种采用多角度耦合分幅方式的高速相机光学系统。该系统分幅结构采用多组相同的光学系统,在平行于物面的圆周上均匀分布,分别从不同角度拍摄同一物面,在保证各组系统的物方视场相同的情况下,每组光学系统的光轴与物平面的夹角均相同,通过优化设计得到全视场的最佳成像。根据需求,使用光学设计软件设计了多角度耦合四分幅成像中长焦光学系统并绘制三维立体仿真模型,分析了每组像面像质、照度以及畸变等相关参数,调制传递函数MTF在频率为50 lp/mm处不低于0.5,F数为2,畸变小于0.4%,相较于常用的棱镜和反射棱锥分光方式,无需额外分光结构,像面照度提高4倍以上。结果表明成像质量理想,分幅相机系统各像面所成像一致性高。

Optical system design of multi-angle coupled framing camera

In order to realize the framing function of high-speed cameras, we proposes a high-speed camera optical system using multi-angle coupled framing methods. The framing structure uses multiple groups of the same optical system and is evenly distributed on the circumference parallel to the object plane. The same object surface is photographed from different angles. Each group is guaranteed to have the same object field of view. The angle between the optical axis of the optical system and the object plane is the same, and the best imaging of the entire field of view is obtained through optimization design. According to the requirements, a telephoto optical system in multi-angle-coupled quadrant imaging is designed using optical design software and a three-dimensional simulation model is drawn. The image quality, luminance, distortion, and other relevant parameters of each group are analyzed, and at a frequency of 50lp/mm, the modulation transfer function(MTF) is not less than 0.5, the F number is 2, and the distortion is less than 0.4%. Compared with the commonly used prism and reflective pyramidal spectroscopy, the surface illumination can be increased by more than 4 times without additional splitting structure. The results show that the imaging quality is ideal and the image formation consistency of the image planes of the framing camera system is satisfied.