Constant resolution multi-spectral optical system applicable to large dynamic range and nearly-hemispherical view field

Abstract

The invention provides a constant resolution multi-spectral optical system applicable to a large dynamic range and a nearly-hemispherical view field.The optical system sequentially comprises a homocentric sphere lens, multiple apertures and multiple imaging micro lenses which are in one-to-one correspondence with the apertures in the light incidence direction, and the apertures and the corresponding imaging micro lenses are distributed on the light-out position of the homocentric sphere lens in a fan-shaped mode and located on two different homocentric spherical surfaces of the homocentric sphere lens; each imaging micro lens and the corresponding aperture form a separate imaging channel; the imaging micro lenses comprise multiple short-focus correction lenses, multiple middle-focus correction lenses and multiple long-focus correction lenses, and correction lens sets with different focal lengths are adopted by the imaging micro lenses to correct aberrations in different view fields, so that the constant high resolution is guaranteed.According to the constant resolution multi-spectral optical system, interference of a local intense light source to all the view fields is avoided, and imaging detection within the large dynamic range can be achieved.

Description

technical field [0001] The invention relates to the field of optical imaging, in particular to a constant-resolution multispectral optical system suitable for large dynamic range near hemisphere field of view. It is mainly used for high-resolution airborne / satellite-borne earth observation, and can also be used in urban security monitoring, national land census and other fields. Background technique [0002] High-resolution earth observation technology can use platforms such as satellites or aircraft to carry various imaging sensors to obtain various landscape information on the natural and social landscapes of the earth's surface to meet various application needs. The purpose of high-resolution earth observation is to study the living space environment of the earth and the laws of its movement and change, and to provide scientific basis for human beings to develop the earth's resources, protect the environment, prevent and mitigate disasters, and make macroeconomic and soci...

AI Technical Summary

Problems solved by technology

In 2012, the patent No. 103064171A applied by Beijing Institute of Space Mechatronics, "A New Type of High-Resolution Large-Field Optical Imaging System" adopted the scheme of concentric spherical lens and correction mirror, and did not adopt the secondary imaging scheme. The system structure easier

In 2014, the patent No. 204188263U applied by Soochow University basically adopted the solution in the previous patent, but solved the problem of the diaphragm position in the 2013 solution; at the same time, it added The spectroscopic element is used to realize spectral imaging, which makes the system more complicated, which is especially unfavorable for the later installation and adjustment of the system; at the same time, the working band of the whole system is very narrow, only 0.48-0.65μm, which cannot cover the visible light multi-spectrum ( 0.45-0.9μm) band

At the same time, although the systems mentioned in all the above patents have achieved consistent imaging quality across the entire field of view, they have not been able to achieve the constant resolution of the entire field of view, which is very important for spaceborne / airborne ground detection cameras. Very important

The main reason is that when the camera’s field of view reaches 120°, the distance between the center field of view and the edge field of view’s target to the camera may reach 2-3 times, and the focal length of the entire camera is a fixed value for the full field of view. This will lead to a large gap between the geo-element resolution of the central field of view and the edge field of view

Images