Coaxial three-mirror zooming optical system based on photoisomerization materials

Abstract

Provided is a coaxial three-mirror zooming optical system based on photoisomerization materials. The coaxial three-mirror zooming optical system based on the photoisomerization materials comprises a primary mirror, a secondary mirror, a tertiary mirror and a caliber-variable diaphragm, wherein the caliber-variable diaphragm is located at a system exit pupil position in a short focal length mode, a system aperture diaphragm is arranged on the primary mirror, a classic R-C optical system is formed by the primary mirror and the secondary mirror, radiation light beams of a target scenery are converged by the primary mirror and the secondary mirror to form a middle real image, and the middle real image is imaged on the focal plane of the optical system through the tertiary mirror. According to the coaxial three-mirror zooming optical system based on the photoisomerization materials, the primary mirror, the secondary mirror and the tertiary mirror are made of the photoisomerization materials, changes of coefficients of aspheric surfaces of the mirrors are controlled through the material characteristics of the coaxial three-mirror zooming optical system in the zooming process of the coaxial three-mirror zooming optical system, and finally the coaxial three-mirror zooming optical system can have both the advantages of being large in focal length and high in resolution, and the advantages of being short in focal length and wide in field of view only through the changes of the coefficients of the aspheric surfaces of the mirrors and slight adjustment of the mirror spacing under the condition that the radii of curvature of all the mirrors of the optical system are unchanged.

Description

technical field [0001] The invention belongs to the technical field of spaceflight optical remote sensors, and relates to a coaxial three-reversal zoom optical system based on photoisomerization materials. Background technique [0002] With the continuous development of space optical remote sensing technology, the functional requirements for reconnaissance cameras are becoming increasingly strict. Especially in the field of environmental disaster reduction and military reconnaissance, it is hoped that the camera can complete the general survey of large-scale ground objects and targets, and at the same time it needs to be able to conduct detailed surveys of specific areas. The census emphasizes the wide coverage capability of the camera, and mainly conducts large-scale medium and low-resolution imaging to complete the observation and search of global targets; the detailed investigation emphasizes the ability of the camera to obtain detailed information, mainly for important a...

AI Technical Summary

Problems solved by technology

For the long focal length coaxial three-mirror optical system, due to the simple system structure and only the distance between two mirrors, it is difficult to rely on the nonlinear movement of the mirror distance while meeting the image quality requirements of long and short focal length modes, so the mechanical zoom solution is not very suitable for long focal lengths coaxial reflective system

At the same time, for the coaxial three-mirror optical system with large aperture and long focal length, if you want to realize the system zoom through the change of surface curvature, this means that the amount of change of each surface may be very large, and the structural design is difficult to ensure its high performance in orbit. stability, which greatly reduces the engineering feasibility of the system

It can be found that none of the existing zoom methods can meet the needs of the future long focal length and large aperture coaxial three-mirror space optical system

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