环形子孔径拼接检测大口径非球 面镜的规划模型及分析

环形子孔径拼接技术是一种无需辅助元件就能检测旋转对称大口径非球面镜的有效手段。根据该技术的检测原理,从几何光学的角度建立了子孔径规划模型,给出了模型数值求解的具体方法。以一口径为700 mm、中心遮拦为160 mm、顶点曲率半径为3 000 mm的抛物面镜为例进行了数值计算,且从物理光学的角度对数值计算结果进行了进一步分析和解释,并进行了初步的实验研究。结果表明,该模型具有较好的预测效果,可为实际检测方案设计提供理论依据,使得检测过程可控、量化和可重复。

Layout model and analysis of annular subaperture stitching technique for testing large aspheric mirror

Annular subaperture stitching technique is a feasible method for testing rotationally symmetric aspheric mirror without any additional elements. Based on the testing principle, a subaperture layout model was established with geometry optics theory, and the numerical solving method was provided in detail. Taking a paraboloidal mirror with clear aperture of 700 mm, center obscuration of 160 mm, and vertex curvature radius of 3000 mm as a example,the paper analysized and explained the numerical results of model with the corresponding physical optics theory. The experimental results show that the model is better in predictability, and it will provide the theory basis for the practical measurement and also will make the measurement process more controllable,quantitative and repeatable.