Large field of view and off-axis integrated three-trans space optical system

Abstract

The large-field-of-view and off-axis integrated three-trans space optical system relates to the field of aerospace optics. The present invention adopts a total reflection system structure, and combines a small F-number coaxial three-mirror optical system with two large F-number off-axis three-mirror optical systems, mainly including a primary mirror, a secondary mirror, three three mirrors, four Folding mirrors, three image planes and two aperture stops; the light path of the small F-number coaxial three-mirror optical system is folded by two folding mirrors, which are respectively located behind the secondary mirror and the third mirror during the propagation of the light path, and the two large F The optical path of the off-axis three-mirror optical system is folded by folding mirrors, and is located behind the secondary mirror during the propagation of the optical path. The aperture diaphragm of the small F-number coaxial three-mirror optical system is located on the primary mirror, and the two large F-numbers are off-axis. The aperture diaphragms of the three mirror optical systems are located at the exit pupils of the respective systems. The imaging field of view of the present invention can reach 4°-6°, the cost is low, the installation and adjustment are simple, and the imaging of large field of view can be realized while ensuring the high-resolution observation of the central field of view, and the transfer function and imaging quality are high.

Description

technical field [0001] The invention relates to the technical field of aerospace optics, in particular to a three-trans space optical system integrated with a large field of view and off-axis. Background technique [0002] In the fields of aerospace and near-space optical remote sensors to be developed, the requirements for high-resolution and large-field imaging of space optical cameras are constantly increasing, and reflective optical systems with longer focal lengths and larger fields of view are generally required. Compared with the traditional transmission camera optical system, it has the advantages of wide spectrum, simple structure, small size and light weight, and the reflection system does not produce chromatic aberration. The direction of development of the camera. [0003] So far, such space optical cameras have adopted two types of three-reflection optical system (TMA), coaxial three-mirror optical system and off-axis three-mirror optical system at home and abr...

AI Technical Summary

Problems solved by technology

The aperture diaphragm of the common coaxial three-mirror optical system is located on the primary mirror, with an intermediate image plane and a real exit pupil. The imaging field of view is generally small, and at the same time there is inevitably a large obstruction, so the design is to obtain high The transfer function value (MTF) and the detection ability in the infrared band need to appropriately reduce the F number and increase the size of the mirror, but at the same time the difficulty of processing and inspection will increase, and the design field of view will also decrease; off-axis three There is no obstruction in the reflective optical system, and the field of view of the off-axis three-mirror optical system with the aperture stop located on the primary mirror is about twice that of the coaxial three-reflective optical system, but the processing, inspection and system of the large-aperture off-axis reflector It is more difficult to install and adjust

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