Broadband, large field of view, large aperture, folding axis, triple mirror and afocal optical system

Abstract

The invention discloses a wide-band, large-field-of-view, and large-diameter folded-axis triple-reflection afocal optical system, which is used for detecting targets in a long distance and in a large range, and improves the target detection distance and detection probability. The structure of the optical system is as follows: a parabolic primary reflector and a hyperboloid secondary reflector form a telescopic objective lens system, the object focus of the hyperboloid three reflectors coincides with the image focus of the telescopic objective, the entrance pupil is located on the primary reflector, and the plane The scanning mirror is located at the exit pupil of the system. The optical structure provided by the present invention realizes the design of a large-field-of-view large-aperture folded-axis triple-mirror afocal optical system without secondary occlusion through slight eccentricity and inclination. Compared with the coaxial system, it maintains a similar mechanical structure, but avoids the secondary obstruction caused by the three mirrors under the large field of view, and the field of view is relatively increased; compared with the traditional off-axis system, it has a compact structure and a small volume, which meets Requirements for system miniaturization and light weight; the amount of eccentricity and tilt introduced is small, the magnification is large and the MTF is close to the diffraction limit.

Description

technical field [0001] The invention relates to a wide-band, large-field-of-view, large-aperture folding-axis triple-mirror afocal optical system, which is applicable to the front afocal telescopic system of the third-generation forward-looking infrared system. Background technique [0002] Afocal system is also called telephoto system. As an important optical system, it is mainly used in laser beam expander, infrared and forward-looking infrared, telephoto lens and zoom lens. Among them, the forward-looking infrared system consists of a front telescopic afocal system and a subsequent imaging system. As the common aperture part of the multi-channel imaging system, the front telescopic afocal system compresses the entrance pupil, the scanning mechanism is located at the exit pupil, and the reflected collimated beam enters the subsequent imaging system. With the third-generation forward-looking infrared imaging system jointly developed by Raytheon and the Night Vision and Ele...

AI Technical Summary

Problems solved by technology

However, for large-diameter systems, the off-axis distance is large, the magnification is difficult to increase, and the processing cost and difficulty of assembly and adjustment are greatly increased.

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