Large view field off-axis three-reflector system and adjusting method

Abstract

The invention relates to a large view field off-axis three-reflector system and an adjusting method. The large view field off-axis three-reflector system comprises a main mirror, a secondary mirror, an aperture diaphragm, a third mirror and a focal plane. The main mirror is an off-axis hyperboloid reflector; the secondary mirror is a protruding spherical surface reflection mirror; the third mirror is an off-axis secondary recessed flat spherical mirror; the master axes of the master mirror and the third mirror are superposed as a reference axis; the aperture diaphragm is successively arranged on the secondary mirror; the optical axis of the secondary mirror is superposed with the master axis of the third mirror; a target light ray from infinity enters the secondary mirror after reflection of the main mirror and enters the third mirror through the reflection of the secondary mirror; and then the light ray is imaged on the focal surface. The invention solves the contradiction between the large view field off-axis three-reflector system, the processing and adjusting. The large view field off-axis three-reflector system adopts a simple structure and can realize the wide width imaging, wherein the effective view field reaches 12 degree*3.5 degree.

Description

technical field [0001] The invention relates to a large field of view off-axis three-mirror optical system and an assembly method, which are mainly used in the rapid design, processing and assembly of various large-field off-axis three-mirror systems. Background technique [0002] All kinds of off-axis three-mirror systems currently researched are difficult to solve the contradiction between large field of view and difficulty in processing and assembly. Most of the systems are designed with high-order aspheric mirrors with large off-axis. Many unfavorable factors have been brought about by installation and adjustment, which is not convenient for the rapid prototyping of the whole system and is not conducive to the engineering of the project [0003] In the past, the secondary mirrors of off-axis three-mirror systems with large fields of view were designed with convex high-order aspheric surfaces. Such a design is very easy for designers, but it brings considerable challenges...

AI Technical Summary

Problems solved by technology

[0002] All kinds of off-axis three-mirror systems currently researched are difficult to solve the contradiction between large field of view and difficulty in processing and assembly. Most of the systems are designed with high-order aspheric mirrors with large off-axis. Many unfavorable factors have been brought about by installation and adjustment, which is not convenient for the rapid prototyping of the whole system and is not conducive to the engineering of the project

[0003] In the past, the secondary mirrors of off-axis three-mirror systems with large fields of view were designed with convex high-order aspheric surfaces. Such a design is very easy for designers, but it brings considerable challenges to optical processing, testing, and assembly. Difficulty; among them, the processing of convex aspheric surface is difficult to detect; at the same time, it is also difficult to establish the benchmark of off-axis aspheric surface, which is difficult to operate for system assembly and adjustment

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