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An imaging system with 15° field of view telecentric three mirrors coaxial

An imaging system and mirror technology, applied in the field of space optics, can solve problems such as not being able to meet the requirements of the field of view width, and achieve the effects of less difficulty in system processing and assembly, easy system assembly, and reduced complexity

Inactive Publication Date: 2011-12-14
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Although the imaging system can achieve a field of view angle of 10°, it still cannot meet the requirements for the width of the field of view in some special applications. The size of resource information

Method used

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  • An imaging system with 15° field of view telecentric three mirrors coaxial
  • An imaging system with 15° field of view telecentric three mirrors coaxial
  • An imaging system with 15° field of view telecentric three mirrors coaxial

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Embodiment Construction

[0012] The invention presses figure 2 The structure shown is implemented. Among them, select the image side focal length f′=-720mm, the relative aperture D / F=1 / 4, the off-axis angle of the field of view is 8°, and the radius of curvature of the apex of the reflection surface of the main mirror 6 is R 1 =-1846.21236mm, the radius of curvature of the vertex of the reflective surface of the secondary mirror 7 R 2 = -566.92974mm, the radius of curvature R of the vertex of the reflection surface of the three mirrors 8 3 = -809mm, the distance d from the primary mirror 6 to the secondary mirror 7 1 =-404.5mm, the distance d from the secondary mirror 7 to the third mirror 8 2 =404.5mm, the distance d from the three mirrors 8 to the image plane 10 3 = -666.26761mm, the aspheric coefficient e of the reflective surface of the main mirror 6 1 2 = 4.44886, e 1 4 =2.56243e-011, the aspheric coefficient e of the reflective surface of the secondary mirror 7 2 2 =0, the aspheric coefficient e o...

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Abstract

The invention provides a telecentric imaging system with field of view of 15 degrees and three coaxial reflectors, belongs to the space optics technical field, and relates to a telecentric off-axis three-reflector imaging system. A technical problem to be solved is providing a telecentric imaging system with field of view of 15 degrees and three coaxial reflectors. A technical scheme is as follows: the imaging system comprises a main mirror, a second mirror, a third mirror, an aperture diaphragm and an imaging surface, the main mirror, the second mirror, the third mirror and the aperture diaphragm are coaxial, and the main mirror and the third mirror are coplanar; the second mirror is placed on a reflected light path of the main mirror, the third mirror is placed on a reflected light pathof the second mirror, and the aperture diaphragm is placed on a mirror plane edge of the second mirror; in order to realize telecentric image space, a distance from the aperture diaphragm to the third mirror is half of a summit radius of curvature length of the third mirror; in order to realize wide field of view of 15 degrees, the second mirror is a convex spherical mirror, and the main mirror and the third mirror are concave quarticsurface mirrors; a distance from the second mirror to the third mirror is larger than half of a system image space focal length. According to the system, abundant ground resource information is obtained, and the system has low processing and adjusting difficulty.

Description

Technical field [0001] The invention belongs to a telecentric off-axis three-mirror imaging system used for a multi-spectral imager and an imaging spectrometer front optical imaging system involved in the technical field of space optics. Background technique [0002] The imaging spectrometer is an advanced optical remote sensor that organically combines the optical imaging system and the spectral spectroscopy system. It can obtain the spatial and spectral characteristics of the target at the same time, and realize the comprehensive detection and identification of the target characteristics. It is used in science and resource census And economic construction and other fields have very wide applications. [0003] The front optical imaging system and the rear spectroscopic system of the imaging spectrometer are both telecentric. Compared with the transmissive imaging system and the reflective imaging system, it has the characteristics of simple structure, no chromatic aberration, wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/02G02B17/06G02B5/10
Inventor 刘晓梅向阳
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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