Ultra-wide field-of-view off-axis three-reflector optical imaging system

An optical imaging system and three-mirror technology, used in optics, optical components, instruments, etc., can solve the problem of difficult to achieve a wide field of view, and achieve the effect of suppressing stray light

Active Publication Date: 2017-02-08
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for this system to achieve a wide-line field of view of more than 100° while obtaining better image quality

Method used

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  • Ultra-wide field-of-view off-axis three-reflector optical imaging system
  • Ultra-wide field-of-view off-axis three-reflector optical imaging system
  • Ultra-wide field-of-view off-axis three-reflector optical imaging system

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Embodiment 1

[0025] The technical solution provided in this embodiment is applicable to the front telescopic system of the ultra-wide field of view hyperspectral imaging system. See attached figure 1 and 2 , which are schematic diagrams of side view and top view of the imaging optical path of the optical system of this embodiment, respectively. Among them, 1 is the main mirror, 2 is the secondary mirror, 3 is the third mirror, 4 is the system aperture stop, 5 is the image plane, and 6 is the common axis of symmetry of the secondary mirror and the third mirror. In this embodiment, the focal length of the image side of the system is selected f ˊ=17mm, relative aperture D / F=1 / 4, field of view 108°×0.05°, wavelength 0.27μm~2.4μm.

[0026] Depend on figure 1 and 2 It can be seen that the off-axis three-mirror telephoto objective lens provided by the present embodiment includes a primary mirror 1, a secondary mirror 2 and a third mirror 3; Reflected light path; in order to avoid obstructio...

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Abstract

The invention discloses an ultra-wide field-of-view off-axis three-reflector optical imaging system which comprises a main reflector with positive focal power, a second reflector with negative focal power, and a third reflector with positive focal power. The reflecting surface of the main reflector is a spherical surface. The reflecting surfaces of the secondary mirror and the third reflector are flat spherical secondary curved surfaces. The curvature radii of top points of the three reflectors approximately satisfy a flat image field condition. The main reflector generates a real image of a far scene between the main reflector and the second reflector. The second reflector and the third reflector perform relay imaging of the real image on an image plane. An aperture diaphragm is placed on the front focal plane of the third reflector, thereby realizing an image-side telecentric optical path. The main reflector inclines along an X-axis relative to incident main light of a central field-of-view. The second reflector is coaxial with the third reflector. After the main light of the central field-of-view in a meridian plane is reflected by the main reflector, an included angle is formed between the reflected main light and the common symmetric axis of the second reflector and the third reflector. The ultra-wide field-of-view off-axis three-reflector optical imaging system has advantages of ultra-wide field-of-view, intermediate relative aperture, wide working wave band, no image-side telecentric barrier, small object-side distortion, high imaging quality, etc. The ultra-wide field-of-view off-axis three-reflector optical imaging system is suitable for earth imaging observation field of a spatial camera, an imaging spectrometer, etc.

Description

technical field [0001] The present invention relates to a telescopic objective lens that can be used for space cameras and imaging spectrometer front objective lenses, in particular to an ultra-wide field of view off-axis telecentric three-mirror telescopic objective lens that can work in the ultraviolet to infrared band, which belongs to optical imaging technology field. Background technique [0002] In recent years, wide coverage of large field of view has become an important development trend of optical remote sensing instruments. The field of view is an important indicator of the earth observation instrument, which determines the global coverage and revisit period of the observation instrument. The larger the field of view, the shorter the revisit period, and the higher the time resolution. [0003] The off-axis reflective optical system has the advantages of simple structure, no chromatic aberration, no central occlusion, easy to enlarge the relative aperture, good hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B17/06
Inventor 沈为民刘青函毛静超
Owner SUZHOU UNIV
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