Rectangular large-field distortion-eliminated off-axis three-mirror anastigmat (TMA) optical system

An optical system and large field of view technology, applied in the field of space optics, can solve the problems of large distortion and small field of view, and achieve the effects of light weight, convenient application and simple structure

Inactive Publication Date: 2012-07-18
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In order to solve the problems of small field of view and large distortion of the existing off-axis TMA optical syst

Method used

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  • Rectangular large-field distortion-eliminated off-axis three-mirror anastigmat (TMA) optical system
  • Rectangular large-field distortion-eliminated off-axis three-mirror anastigmat (TMA) optical system
  • Rectangular large-field distortion-eliminated off-axis three-mirror anastigmat (TMA) optical system

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Embodiment Construction

[0016] Such as figure 1 As shown, the rectangular large field of view, distortion-removing off-axis TMA optical system of the present invention includes an incident ray 1, a primary reflector 2, a secondary reflector 3, a third reflector 4 and an imaging receiver 5, and the incident ray 1 is incident to the main reflector 2, reflected by the main reflector 2 to the secondary reflector 3, reflected by the secondary reflector 3 to the third reflector 4 and then received by the imaging receiver 5; the secondary reflector 3 is arranged at the system aperture Stop position, the distance between the main reflector 2 and the secondary reflector 3 is equal to the distance between the third reflector 4 and the secondary reflector 3, the secondary reflector 3 is a secondary aspheric surface, and the primary reflector 2 contains The high-order aspheric surface of the eleventh order and the fifteenth order, the third reflector 4 is a high-order aspheric surface including the nineth order ...

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Abstract

A rectangular large-field distortion-eliminated off-axis three-mirror anastigmat (TMA) optical system belongs to the technical field of space optics and solves the problem that the existing off-axis TMA optical system is small in field and large in distortion. The technical scheme is that the optical system comprises incident light, a primary reflecting mirror, a secondary reflecting mirror, a third reflecting mirror, an optical axis and an image receiver. The incident light is irradiated on the primary reflecting mirror, and then is reflected to the secondary reflecting mirror through the primary reflecting mirror and reflected to the third reflecting mirror through the secondary reflecting mirror to be received by the image receiver. The secondary reflecting mirror is arranged at a position of a system aperture diaphragm, the distance between the primary reflecting mirror and the secondary reflecting mirror is equal to that between the secondary reflecting mirror and the third reflecting mirror, the secondary reflecting mirror is a secondary aspheric surface, the primary reflecting mirror is a high-order aspheric surface containing an 11-order item and a-15 order item, and the third reflecting mirror is a high-order aspheric surface containing a 9-order item and a 15-order item. The rectangular large-field distortion-eliminated off-axis TMA optical system provides reference and practical reference values for designs of a large-field high resolution-ratio imaging spectrometer and a target analogue simulation system.

Description

technical field [0001] The invention belongs to the technical field of space optics, and in particular relates to a rectangular large field of view, distortion-removing off-axis TMA optical system. Background technique [0002] Due to structural constraints, the field of view of the coaxial reflector system is limited to a certain extent, resulting in a too small observation frame; at the same time, the system has a central block, so the MTF of the system will drop sharply, affecting the resolution of the system. [0003] The off-axis reflective system is highly praised by the industry because of its large field of view and no obstruction, which improves the resolution of the system and suppresses stray light. It has become a research hotspot in the field of space remote sensing. However, the design of off-axis three-reflection optical system in the world basically adopts the strip-shaped field of view to achieve a large field of view, that is, the sagittal field of view is ...

Claims

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Application Information

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IPC IPC(8): G02B17/06G02B13/18
CPCG02B17/0642
Inventor 赵文才马军任建军
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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