Main-three-reflector-integrated coaxial four-reflector optical system

Abstract

The invention relates to a main-three-reflector-integrated coaxial four-reflector optical system, and belongs to the technical field of space optical remote sensing. The optical system comprises a main reflector, a secondary reflector, a third reflector and a fourth reflector, wherein the four reflectors are coaxially arranged, so that the axial length of the optical system is effectively reduced;and the secondary reflector and the fourth reflector are located on the same side of the main reflector, and the main reflector and the third reflector are integrally machined and designed, so that the machining and adjusting difficulty is reduced. The four secondary aspheric reflectors are adopted, so that astigmatism and field curvature correction is facilitated, and system stray light is highly and effectively suppressed at the first image plane based on the secondary imaging principle. The optical system is compact in structure, low in distortion and good in stray light inhibition.

Description

Technical field [0001] The invention relates to the technical field of space optical remote sensing, in particular to an integrated coaxial four-reflection optical system with main three mirrors. Background technique [0002] With the rapid development of aerospace technology, people’s demand for high-resolution images has become more and more urgent. While meeting high-resolution imaging, people’s requirements for the compactness of the optical system structure and the difficulty of processing and installation are becoming more and more urgent. Come higher. [0003] The RC telescope has the best overall performance in the two-mirror telephoto system, which can correct spherical aberration and coma, but usually has larger astigmatism. By using three quadric mirrors, sufficient degrees of freedom can be provided to correct all third-order primary aberrations. In addition to correcting spherical aberration and coma, third-order astigmatism can be corrected. Existing coaxial three-m...

AI Technical Summary

Problems solved by technology

The existing coaxial three-mirror optical system has a large central occlusion in the case of a large field of view, which has a great impact on the energy entering the system, reducing the system transfer function and imaging quality; off-axis three-mirror optical system processing, assembly and adjustment And optical detection has increased the difficulty, and the ability of the three-reflective optical system to correct distortion is poor, and this technical deficiency can be made up for by designing a four-reflective optical system

[0004] The coaxial four-mirror structure can correct distortion very well. For example, the invention patent with the publication number CN102866487A and the name "coaxial four-reflective ultra-low distortion optical system" is the coaxial four-reflective ultra-low distortion optical system in the coaxial TMA optical system. Based on the introduction of four mirrors with small focal power and large aspheric coefficient, the four mirrors are located near the exit pupil of the system, and the pupil aberration of the system is corrected through the aspheric coefficient of the four mirrors, so that the system can achieve ultra-low distortion, but the total length of the system is relatively large , the third and fourth mirrors are too far away from the main mirror, and the compactness of the volume needs to be improved

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