摘要
提出鱼眼镜头光阑球差的级数表达式及其基于有限差分的近似计算方法,解决了通常的光阑倒追方法面临的难题;讨论孔径光阑与入瞳的特殊“共轭”关系,分析了光阑彗差和像差渐晕;运用Aitkin插值技术填补“溢出”光线在像面上的落点,以保证像质函数定义的一致性,维持自动优化持续进展,从而克服频繁的光线“溢出”造成的严重困难;提出充分利用像差渐晕改善像面照度均匀性的方法;论述标定轴外光束边界的逐次渐近过程和运用入瞳距离变量实现孔径光阑位置全域优化的技术.
The series formula and its corresponding differential equation of fish-eye lens＇ stop spherical aberration have been brought forward. Calculating the approximation of the stop spherical aberration according to these formulas,and then adopting iteration, we can confirm the entrance pupil＇s position and primary ray accurately. Furthermore,it analyzes the stop＇s coma, discusses the special “conjugate” relation between aperture stop and entrance pupil, and how to improve the uniformity of image plane illuminance by using aberration vignetting. Ray＇s total reflection or no-intersection at refracting surface is called “ray overflow”. Frequent ray overflows in the optical automatic design of fish-eye lens makes its CAD very hard. Using Aitkin Interpolation to fill up the intersection points of overflow-rays at image plane can ensure the optimization process persistently to go along, and then clearing up the overflow gradually. In the end, it expounds the successive approach method to confirm the boundary of abaxial beams, and how to realize global optimization of the aperture stop＇s position using the entrance pupil＇s distance variable.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2005年第7期1078-1080,共3页
Acta Photonica Sinica
基金
国家863计划项目(02AA776031)
关键词
热成像鱼眼镜头
光阑球差
像差渐晕
Aitkin插值
全域优化
IR thermal imaging fish-eye lens
Stop spherical aberration
Aberration vignetting
Aitkininterpolation
Global optimization
