Coaxial four-mirror optical system

Abstract

The invention provides a coaxial four-mirror optical system. The system comprises a first reflector, a second reflector, a third reflector, a fourth reflector, a primary image plane, a spectroscope, afirst focal plane and a second focal plane which are rotationally and symmetrically arranged along an optical axis, a light beam emitted by an object at infinity of the object space is reflected by the first reflector and enters the second reflector, the light beam is reflected through the second reflector and is converged on the primary image surface, the light beam is diverged after passing through the primary image plane, enters the third reflecting mirror, is reflected by the third reflector, then is reflected to the fourth reflector, is reflected by the fourth reflector, enters the spectroscope, and is split by the spectroscope, and the split light beams are respectively converged on the first focal plane and the second focal plane. A coaxial four-mirror optical system structure formis adopted, the total length of the system is reduced by using multiple folding of an optical path, the cylinder length-to-focal length ratio of the optical system is further reduced, and the aberration balance capability of the optical system is improved.

Description

technical field [0001] The invention relates to the technical field of optical imaging systems, in particular to a coaxial four-reflection optical system. Background technique [0002] With the continuous improvement of space exploration and earth observation requirements, high-resolution imaging puts forward higher requirements on the focal length of space optical payloads. Generally, the longer the focal length, the higher the imaging resolution. The focal length of the current mainstream commercial satellite payloads has been developed to a level of 8-10 meters or higher. For example, the focal length of the IKONOS camera is 10m, and the focal length of the WorldView2 camera reaches 13m. Although a long focal length camera will improve the imaging resolution, it will also cause an increase in the quality and volume of the optical system, and the reflection cost for satellites or missiles will also increase accordingly. Therefore, the light and miniaturized design of the ...

AI Technical Summary

Problems solved by technology

[0005] The existing technology uses three mirrors to balance the aberration of the optical system, which cannot further reduce the tube length of the system and reduce the volume of the optical system while ensuring the imaging quality; the second mirror in the prior art is multiplexed in the imaging optical path , so the manufacturing tolerance of the second reflector is relatively strict; at the same time, the second reflector is a convex quadric surface, and the processing and detection of the convex quadric surface are relatively difficult, which adds a lot of difficulties to the manufacture and surface shape detection of the optical reflector

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