Long-focal length large-aperture large-F-number telescopic imaging system

Abstract

The invention relates to a long-focal length large-aperture large-F-number telescopic imaging system. The long-focal length large-aperture large-F-number telescopic imaging system comprises a primary reflector, a secondary reflector, a phase mask for encoding, a correction lens group A, a correction lens group B, an area array CMOS image sensor and a decoding processing unit; the secondary reflector is arranged on a light path where reflection light is located, wherein the reflection light is formed after light is reflected by the primary reflector; the secondary reflector, the phase mask, the correction lens group A, the correction lens group B and the area array CMOS image sensor are sequentially arranged on the same light path; and the decoding processing unit is connected with the area array CMOS image sensor. According to the long-focal length large-aperture large-F-number telescopic imaging system provided by the invention, a wave-front coding technology is introduced to the design of the long-focal length large-aperture large-F-number telescopic imaging system; controllable modulation transfer function (MTF) reduction can be realized artificially through utilizing an encoding technology; and therefore, effects of subsequent MTF compensation (MTFC) technologies can be more stable and reliable.

Description

technical field [0001] The invention belongs to the field of optics and relates to an imaging system, in particular to a telephoto imaging system with a long focal length, a large aperture and a large F number. Background technique [0002] Ground-based large telescopes for astronomical observations and space cameras for earth observations often use long focal lengths and large apertures as the basic requirements for long-distance high-resolution imaging, and the improvement of spatial resolution is the relentless pursuit of researchers. Target. [0003] In order to improve the spatial resolution of the system, there are two options: one is to increase the focal length of the system while keeping the relative aperture constant, and the other is to increase the F-number of the system. For the former, when the focal length of the system increases, keeping the relative aperture constant will inevitably lead to an increase in aperture, which will directly lead to an increase in...

AI Technical Summary

Problems solved by technology

At present, the focus mechanism is generally used to make the focal plane reach the best position, but this method needs to use image clarity as feedback, or adjust the position of the focus plane manually or automatically, which not only affects the focus There are strict requirements for strategy and adjustment accuracy, and there are problems in timeliness. For example, when dealing with rapidly changing astronomical phenomena or target imaging, it is easy to lose important information that appears occasionally

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