Method for Improving Imaging Quality of Off-Axis Three-mirror Optical System

Abstract

The present invention relates to the imaging theory of an optical system. In order to compensate the imaging position of an off-axis three-mirror optical system and improve the imaging quality of the system, the technical scheme adopted in the invention is a method for improving the imaging quality of an off-axis three-mirror optical system, which equates the off-axis three-mirror system to a single reflection system. The method establishes an imaging model with a reference mirror, and uses a mathematical method of equivalent and coordinate conversion to theoretically deriving an imaging formula, wherein a point light source passes through a mirror D1 and a reference mirror D2, a point r is converged on a CCD of a focal plane, a mirror center Os is taken as the origin to establish an ideal coordinate system OsXsYsZs, the Zs axis and the sight axis are in the same line, an actual imaging coordinate system OrXrYrZr is established with the actual CCD center Or as the origin. The method of imaging coordinate compensation considers only the optical axis rotation translation and the focal length change while ignoring optical distortion errors. The method is mainly applied to the imaging detection occasions of the optical system.

Description

technical field [0001] The invention relates to an imaging theory of an optical system, and relates to a theoretical analysis of the position change of the visual axis of an off-axis three-mirror optical system and the imaging quality of the system. Specifically, it relates to a method for improving the imaging quality of an off-axis three-mirror optical system. Background technique [0002] The off-axis three-mirror optical system does not produce chromatic aberration, has no secondary spectrum, uses a wide band, can make the aperture large, and is easy to reduce weight. The three-mirror can obtain a larger field of view, and it is easy to control the stray radiation of the optical system. At the same time, because the off-axis system has no central obstruction, the luminous flux entering the optical system is relatively large, which makes the image plane illumination more uniform and high-resolution imaging, which can meet the requirements and development direction of the ...

AI Technical Summary

Problems solved by technology

Due to the large number of mirrors in the off-axis three-mirror system, the absence of the central optical axis of each mirror, and the off-axis and asymmetry of the optical structure, it is very difficult to assemble the system

At present, the method of combining initial positioning and computer-aided adjustment is mainly used. The assembly process will bring position errors of optical components, which will change the imaging axis of the system, generate imaging positioning errors, and reduce the imaging accuracy and quality of the camera.

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