Light and small coaxial-like five-reflex optical system with large field of view and low distortion

Abstract

The invention discloses a light and small coaxial-like five-reflex optical system with a large field of view and low distortion, and relates to the field of aerospace optical remote sensors. The lightand small coaxial-like five-reflex optical system with a large field of view and low distortion comprises an aperture diaphragm, a primary mirror, a secondary mirror, a third mirror, a fourth mirror,a fifth mirror and a plane mirror; the light passes through the primary mirror, the secondary mirror, the plane mirror, the third mirror, the fourth mirror, the fifth mirror in turn to form an imageon an image surface; the aperture diaphragm is located on the primary mirror; the primary mirror is inclined with respect to an optical axis of the light incident on the primary mirror; the plane mirror, the third mirror, the fourth mirror, and the fifth mirror are all located behind the primary mirror; the primary mirror is a quadric surface; the secondary mirror, the third mirror, the fourth mirror and the fifth mirror are all high-order spherical surfaces; and the primary mirror and the secondary mirror constitute a concave reflector group. The invention has the characteristics of small size, low cost, low distortion, large field of view, wide spectral range, no obstruction, long focal length, etc., and can realize high-precision ground detection and mapping, is especially used as a high resolution camera with a small size and low cost of a micro-nano satellite.

Description

Technical field [0001] The invention relates to the technical field of aerospace optical remote sensors, in particular to a coaxial-like five-mirror optical system with light, small size, large field of view and low distortion. Background technique [0002] With the continuous development of science and technology and the increasing demand for high-resolution remote sensing images, space cameras with high spatial resolution have become an important development trend. On the other hand, in order to increase the speed of image acquisition in sensitive areas, requirements for satellite revisiting capabilities are required, which requires stronger wide-format imaging capabilities. However, due to the angle of view of the satellite, the ground width will not be too large, so using small satellites to form a network has become the most effective way. Therefore, the design of a small-sized high-precision space camera suitable for micro-nano satellites has also been put on the agenda. ...

AI Technical Summary

Problems solved by technology

But its field of view is small, the full field of view is only about 1 degree, and the secondary mirror blocks the light, the modulation transfer function of the optical system will drop significantly in the mid-frequency band

Images