基于遗传算法的波前编码相位板参数优化

波前编码(WFC)是一项使光学系统在维持相对孔径的同时扩大焦深的新技术。现以光学传递函数稳定性作为目标函数,以遗传算法作为搜索算法,优化得到一个适用于焦距f为100mm,光圈F为5,最大半视场角3°的双胶合透镜系统的波前编码相位板的修正形式的三次项系数。模拟结果表明在像面固定的情况下,传统光学系统只能在无穷远到300m内清晰成像,而经优化的波前编码系统可以在物距无穷远到5m内清晰成像,大幅度增加了光学系统的景深。

The optimization of phase mask of wavefront coding system based on genetic algorithm

Wavefront coding(WFC) is a novel technology to extend optical system′s depth of field with relative aperture unchanged.This paper takes the stability of optical transfer function as the object function and the genetic algorithm as the search method to optimize doublet system′s modified cubic phase mask of the WFC system.The parameters of the system we adopt are as follow: f=100mm,F=5,the maximal 1/2 filed angle is 3°.The simulation results show that the optimized WFC system′s depth of field is much larger than the traditional one with the image plane fixed.The traditional system can obtain sharp image where the object distance is from infinite to 300m,while the optimized WFC system is from infinite to 5m.