物镜像面相对照度计算方法

Calculation Method of Relative Illumination of Lens Image Plane

为了找到更加精确的广角物镜系统像面相对照度计算方法,分析了现行像面照度公式成立条件的局限性,提出了基于孔径光阑约束模式的矢量光线追迹计算光通量的方法。通过矢量分析和推导,给出了孔径光阑约束的轴外视场光束在第一光学面上形成的照射区的特征点坐标及照射区面积表达式;依据朗伯体辐射条件和规律,从物镜系统物方着手,建立了两种共轭条件的物镜像面照度分析模型;针对具有物方大视场角特征的相似成像物镜系统和非相似成像物镜系统,分别推导出了像面照度及相对照度表达式;指出了光学设计过程中提高像面相对照度的基本策略。

In order to find a more accurate calculation method of relative illumination of lens image plane in a wideangle lens system,the limitation of the existing calculation method is analyzed,and a method to calculate luminous flux by vector ray tracing based on aperture stop constraint mode is introduced.The expressions of feature points coordinates and illuminated area of the first optical surface from abaxial ray under the control of aperture stop are presented through vector analysis and derivation.According to the condition and the law of Lambert radiator,from object space of lens,two kinds of lens image illumination analysis modes under conjugated condition are set up.For similar imaging system and non-similar imaging system with large field,the expressions of image illumination and relative illumination are derived respectively.A basic scheme to increase relative illumination during optical designing is proposed.