An off-axis three-mirror optical system with long focal length and wide rectangular field of view

Abstract

An off-axis three-mirror optical system with a long focal length and a wide rectangular field of view belongs to the field of space optical system design. The resolution and the large field of view cannot be balanced. Its structure includes a primary mirror, a secondary mirror, a diaphragm, a third mirror, and a charge-coupled device; the primary mirror is the entrance of the entire optical system, and the secondary mirror is placed on the reflection path of the primary mirror. , the diaphragm is docked with the secondary mirror, the third mirror is placed on the reflected light path of the secondary mirror, and the charge-coupled device is placed on the reflected light path of the third mirror; the light first passes through the target reflection, then enters the optical system, reaches the primary mirror, and is picked up by the primary mirror reflection, arrives at the secondary mirror and diaphragm located on the path of the reflection light path of the primary mirror, and then reflects through the secondary mirror, reaches the third mirror located on the reflection light path of the secondary mirror, and then reaches the charge-coupled device after being reflected by the third mirror. for space-to-ground imaging systems.

Description

technical field [0001] The invention belongs to the field of space optical system design, and specifically relates to an off-axis three-mirror optical system with a long focal length and a wide rectangular field of view, which can be equipped with a time-delay-integrated charge-coupled device (TDI-CCD) and applied to a space-to-ground imaging system. Background technique [0002] Whether it is in the military field or in the civilian field, long focal length and high resolution space remote sensing has broad application prospects. At present, the main form of space remote sensing is still to observe the earth through optical cameras. Long focal length, large aperture, and large field of view are its main development trend. However, for large-aperture refractive and catadioptric optical systems, the system needs to use special optical materials or complex structures to eliminate the secondary spectrum, which greatly limits its application. The pure reflective optical system ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the existing off-axis three-mirror optical system that the wide rectangular field of view cannot be realized, the field of view in one direction is limited, and the high resolution and the large field of view cannot be balanced, the present invention proposes a large rectangular field of view with a long focal length off-axis three-mirror optical system

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