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。
