Method for designing flat image field three-mirror astigmatism elimination telescope by taking mirror interval as free parameter

Abstract

The invention relates to a method for designing a flat image field three-mirror astigmatism elimination telescope by taking the mirror interval as a free parameter in the technical field of telescopedesign, and solves the problem that there is no telescope design method for analysis in other forms. The method comprises the steps of determining the focal length according to application requirements; determining an interval d1 between a primary mirror and a secondary mirror, an interval d2 between the secondary mirror and a third mirror and an interval d3 between the rear surface of the third mirror and an image plane according to the mirror surface position or envelope size requirement of the flat image field three-mirror astigmatism elimination telescope system; calculating the curvatureradius of the mirror according to the intersection point height of the paraxial edge light on the image plane, the three-level field curvature of the telescope being zero, d1, d2, d3 and the focal length; and calculating the quadric surface coefficient of the mirror according to the three-level spherical aberration of the telescope being zero, the three-level coma aberration of the telescope beingzero, the three-level astigmatism of the telescope being zero and the curvature radius. According to the method, intuitive structural parameters can be determined in advance before design, and meanwhile, all design solutions of all three-mirror astigmatism elimination telescopes meeting conditions can be conveniently and quickly given.

Description

technical field [0001] The invention relates to the technical field of telescope design, in particular to a design method of a flat image field triple anti-astigmatism telescope with mirror spacing as a free parameter. Background technique [0002] The triple anti-stigmatism optical system can simultaneously correct the four primary aberrations of spherical aberration, coma, astigmatism and field curvature, so that diffraction-limited imaging quality can be achieved in a large field of view, and a compact design can be achieved . Since the design concept of the triple-anti-astigmatism telescope was put forward in the 1970s, it has been widely used in the fields of remote sensing and astronomical exploration. [0003] At present, the mainstream design method of the flat image field triple anti-astigmatism optical system is generally to use the three parameters of the obscuration ratio of the primary and secondary mirrors and the vertical axis magnification of the primary and...

AI Technical Summary

Problems solved by technology

For the three-inverse astigmatism extinction system except the positive-negative-positive focal power combination, there is no other form of analysis of the three-inverse astigmatism extinction system design theory that can be solved, that is, there is no other form of analysis of the flat image field three Design method of anti-astigmatism telescope

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