An ultra-wide field of view off-axis three-mirror optical imaging system
An optical imaging system and three-mirror technology, applied in optics, optical components, instruments, etc., can solve problems such as difficult to achieve wide-line field of view, and achieve the effect of suppressing stray light
Active Publication Date: 2019-09-10
SUZHOU UNIV
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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
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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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The invention discloses an ultra-wide field of view off-axis three-mirror optical imaging system, which includes a primary reflector with positive power, a secondary mirror with negative power and three mirrors with positive power. The reflection surface of the main mirror is The spherical surface, the secondary mirror and the three-mirror reflective surfaces are oblate spherical quadric surfaces, and the vertex curvature radius of the three reflectors approximately meets the flat image field condition; the primary mirror forms a real image of the distant scene between the primary and secondary mirrors, and the secondary mirror and The three mirrors relay the real image to the image plane, and the aperture stop is placed at the front focal plane of the three mirrors to realize the telecentric light path at the image side; the primary mirror is inclined along the X-axis relative to the incident chief ray of the central field of view, and the secondary mirror Coaxial with the three mirrors, the chief ray of the central field of view in the meridian plane is reflected by the primary mirror, and forms an included angle with the common axis of symmetry of the secondary mirror and the three mirrors. It has the advantages of ultra-wide field of view, medium relative aperture, wide working band, unobstructed image space telecentricity, small object space distortion and good imaging quality. It is suitable for the field of ground imaging observation such as space camera and imaging spectrometer.
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...
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IPC IPC(8): G02B17/06
Inventor 沈为民刘青函毛静超
Owner SUZHOU UNIV