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Off-axis TMA optical system for reducing processing and resetting difficulty

An optical system, off-axis technology, applied in the field of space optics, can solve problems such as difficulties, the system is difficult to achieve optical imaging indicators, etc., to achieve the effect of simple structure, overcoming the difficulty of processing and inspection, and convenient installation and adjustment

Inactive Publication Date: 2012-07-25
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides an off-axis TMA optical system that reduces the difficulty of processing and assembly in order to solve the problem that the existing off-axis TMA optical system is difficult to process, detect, and assemble, which leads to the problem that the system is difficult to reach the optical imaging index.

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  • Off-axis TMA optical system for reducing processing and resetting difficulty
  • Off-axis TMA optical system for reducing processing and resetting difficulty
  • Off-axis TMA optical system for reducing processing and resetting difficulty

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specific Embodiment approach 1

[0015] Specific implementation mode 1. Combination figure 1 Describe this embodiment, an off-axis TMA optical system that reduces the difficulty of processing and assembly, including an infinite target 1, a primary reflector 2, a secondary reflector 3, a third reflector 4 and an imaging receiver 5, and the beam passes through infinity The target 1 is incident on the main reflector 2, is reflected by the main reflector 2 to the secondary reflector 3, is reflected by the secondary reflector 3 to the third reflector 4, and is received by the imaging receiver 5; the secondary reflector 3 is spherical surface, the main reflector 2 and the third reflector 4 are aspherical, and the quadratic coefficients of the main reflector 2 and the third reflector 4 are set to zero, and the main reflector 2 and the third reflector 4 are composed of Higher-order aspheric surfaces of sixth and eighth order.

specific Embodiment approach 2

[0016] Specific embodiment two, combine figure 2 , image 3 and Figure 4 This implementation mode is described. This implementation mode is an example of an off-axis TMA optical system that reduces the difficulty of processing and assembly described in the first specific implementation mode:

[0017] The parameters of the optical system of this embodiment are determined: the requirement is that the focal length f'=2000m, the relative aperture D / f'=1 / 8, D is the aperture of the optical system, the field of view angle is 17°, and the off-axis angle is 4.5°. The observation band of the system is 0.5 μm to 0.7 μm in the visible light band, and the imaging receiver is a TDI CCD with a pixel size of 10 μm. The satellite orbit height is 1000Km, the pixel resolution is 5m, the pixel size is 10μm, and the ground coverage width is 268Km.

[0018] The main structural parameters of the optical system are shown in Table 1.

[0019] Table 1

[0020]

[0021] It can be seen from Ta...

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Abstract

The invention relates to an off-axis three-mirror-anastigmatic (TMA) optical system for reducing processing and resetting difficulty, relates to the technical field of space optics, and solves the problems that the conventional off-axis TMA optical system difficultly reaches optical imaging indexes due to difficulty in processing, detection and resetting. In the system, a secondary reflecting mirror is designed to be a sphere, a main reflecting mirror and a third reflecting mirror are designed to be aspheric surfaces, a quadratic term coefficient is set as zero, the main reflecting mirror andthe third reflecting mirror are high-order aspheric surfaces containing a six-order term and an eight-order term respectively; thus, the off-axis TMA optical system reaches diffraction limit optical property. When a transfer function is 50 lp, imaging quality is approximately 0.6, and Streh1 Rate is increased from 0.91 to 0.93; surface shape processing tolerance is expanded from Lambda / 50 to Lambda / 40; and the resetting tolerance of the main reflecting mirror, the secondary reflecting mirror and the third reflecting mirror is expanded by four times. By the system, the processing and resettingdifficulty is reduced; and the system can conveniently realize the optical property of diffraction limit.

Description

technical field [0001] The invention relates to the technical field of space optics, in particular to an off-axis TMA optical system which reduces the difficulty of processing and assembly. Background technique [0002] In order to eliminate various aberrations in the design of the current off-axis three-reflection astigmatism (TMA) optical system, the three mirrors are all designed as aspheric surfaces. The adjustment of the optical system adds a lot of trouble, so that it is difficult for the system to meet the optical design index, or even the imaging index requirements of the optical system. This is also the reason that has restricted the rapid application and development of this type of optical system for a long time. [0003] High-resolution space remote sensing has broad application prospects in both military and civilian fields. At present, the main form of space remote sensing is still to observe the earth through optical cameras. In the large-aperture refractive a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B17/06
Inventor 赵文才任建岳张星祥李丽富陈长征
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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