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Telecentric off-axis three-mirror anastigmatic imaging system with three coaxial reflectors at angle of field of view of 10 degrees

An off-axis three-mirror, imaging system technology, applied in the field of space optics, can solve the problems of difficult processing, adjustment, eccentricity and tilt, etc., to achieve easy installation, reduce complexity, and reduce the difficulty of system processing and adjustment. Effect

Inactive Publication Date: 2011-07-20
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The main problem of this system is: the main mirror 1 and the secondary mirror 2 have eccentricity and inclination in the system, and it is difficult to process and assemble

Method used

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  • Telecentric off-axis three-mirror anastigmatic imaging system with three coaxial reflectors at angle of field of view of 10 degrees
  • Telecentric off-axis three-mirror anastigmatic imaging system with three coaxial reflectors at angle of field of view of 10 degrees
  • Telecentric off-axis three-mirror anastigmatic imaging system with three coaxial reflectors at angle of field of view of 10 degrees

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Embodiment Construction

[0011] The invention according to figure 2 The structure shown is implemented. Among them, the image square focal length f'=-720mm is selected, the relative aperture D / F=1 / 4, the off-axis angle of the field of view is 8°, and the vertex curvature radius R of the primary mirror 6 reflective surface 1 =-1883.90274mm, radius of curvature R of the vertex of the reflecting surface of secondary mirror 7 2 =-562.66767mm, the radius of curvature R of the vertex of the reflective surface of the three mirrors 8 3 =-800mm, the distance d from the primary mirror 6 to the secondary mirror 7 1 =-418.64505mm, the distance d from the secondary mirror 7 to the third mirror 8 2 =400mm, the distance d from the three mirrors 8 to the image plane 10 3 =-662.81345mm, quadratic surface coefficient e of primary mirror 6 reflection surface 1 2 =3.09831, quadratic surface coefficient e of the reflecting surface of secondary mirror 7 2 2 = 0, the quadric surface coefficient e of the three-mirro...

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Abstract

The invention provides a telecentric off-axis three-mirror anastigmatic imaging system with three coaxial reflectors at an angle of field of view of 10 degrees, and belongs to the telecentric off-axis three-mirror anastigmatic imaging system relating to the technical field of space optics, aiming at providing the telecentric off-axis three-mirror anastigmatic imaging system with three coaxial reflectors at the angle of field of view of 10 degrees. The system is characterized by comprising a main mirror, a secondary mirror, a third mirror and an aperture stop which are coaxial, wherein the secondary mirror is placed on a reflecting optical path of the main mirror, the third mirror is placed on a reflecting optical path of the secondary mirror, and the aperture stop is placed on the edge ofthe front surface of the secondary mirror; in order to realize telecentric image, the distance from the aperture to the third mirror is half length of the radius of curvature to the top of the third mirror; in order to realize wide field of view of 10 degrees, the secondary mirror is a convex spherical mirror, the main mirror and the third mirror are concave quadric surface mirrors; and the distance from the secondary mirror to the third mirror is more than half length of the image focus of the system. The system has a coaxial structure, can acquire rich ground resource information amount, and has small difficulty in processing and debugging.

Description

technical field [0001] The invention belongs to the technical field of space optics and relates to a telecentric off-axis three-mirror imaging system used for the pre-optical imaging system of a multispectral imager and an imaging spectrometer. Background technique [0002] The imaging spectrometer organically combines the optical imaging system and the spectral spectroscopic system, which can simultaneously acquire the spatial characteristics and spectral characteristics of the target, and realize the comprehensive detection and identification of the target characteristics. It is a high spatial resolution and high spectral resolution aiming optical Remote sensors have a wide range of applications. [0003] The off-axis three-mirror system has the characteristics of simple structure, no obstruction, wide field of view, no chromatic aberration, good image quality, and compact structure. It can achieve high resolution and high energy utilization, and is increasingly used in ae...

Claims

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Application Information

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IPC IPC(8): G01J3/02
Inventor 刘晓梅向阳
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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