kummer surface

The formula and algorithn of computing isopleth surface control point (isopleth point) are derived, and the method of using Bessel curved surface to fitting isopleth surface is introduced.

根据二维等值线的算法和作图原理提出了三维等值面的概念；导出了根据已知结构离散点分析值的结果，计算等值面型值点（等值点）的计算公式及其算法，并介绍了如何用贝塞尔曲面片来拟合等值面图的方法。

The optical aberration difference between the biconvex Fresenl lens and the plane-convex Fresenl lens was investigated by designing a large aperture Fresenl lens.

通过一个大尺寸菲涅尔透镜的设计,比较了曲面菲涅尔透镜和平面菲涅尔透镜在光学像差方面的差异。