A Coaxial Triple Mirror Zoom Optical System Based on Photoisomerism Material

Abstract

A coaxial triple-mirror zoom optical system based on photo-isomeric materials, which consists of a primary mirror, a secondary mirror, three mirrors, and a variable aperture diaphragm located at the exit pupil of the system in short-focus mode. The aperture diaphragm of the system is located on the primary mirror. The primary mirror and the secondary mirror constitute a set of classic R-C optical system. The radiation beam of the target scene is converged by the primary and secondary mirrors to form an intermediate real image, which is imaged by the three mirrors to the focal plane of the optical system. The primary mirror, secondary mirror, and three mirrors of this optical system are all made of photoisomerized materials. During the zooming process of the optical system, its material properties are used to control the change of the aspheric coefficient of the mirror. Finally, the radius of curvature of all mirrors in the system remains unchanged In this case, the system has the characteristics of long focal length, high resolution, short focal length and large field of view at the same time only through the change of the aspheric coefficient of the mirror and a small amount of adjustment of the mirror spacing.

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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