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Design method for large visual field optical system lens hood with scan mirror

A design method and optical system technology, applied in optics, optical components, telescopes, etc., can solve problems that affect imaging quality

Active Publication Date: 2008-07-02
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide a design method for the front hood of a large field of view optical system with a two-dimensional pointing mirror (scanning mirror), so as to solve the problem that the stray light of the space optical system affects the imaging quality
[0004] The present invention has a design method for a large field of view optical system hood with a pointing mirror, which mainly solves the design problem of the front hood of the optical system as shown in Figure 1

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  • Design method for large visual field optical system lens hood with scan mirror
  • Design method for large visual field optical system lens hood with scan mirror
  • Design method for large visual field optical system lens hood with scan mirror

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0038] Aperture φ of aperture stop 2 of optical system 1 1 =500mm, the angle of view 2ω=0.5°, the pointing mirror 3 is away from the aperture stop S=750mm; the swing angle is θ=±4°, β=±5°, the distance between the center of the pointing mirror 3 and the hood 4 is L=1000mm, The length M of the light shield 4=400mm. The specific design steps of the hood are as follows:

[0039] ① Establish the first reference plane 5 at 100mm in front of the hood 4, at this time L 1 =900mm, φ 2 =514.4mm; establish the second reference plane 6 at 100mm behind the hood 4, at this time L 2 =1500mm, φ 3 =519.6 mm.

[0040] ② Calculate the edge contour curves of the first reference surface 5 and the second reference surface 6 by formula (1) and formula (5).

[0041] ③According to the symmetry of the optical system, the entire closed edge contour curve data of ...

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Abstract

The invention discloses a design method for a lens hood of an optical system with wide field of view, which is provided with a directing mirror and is used to design the preposed lens hood of a telescope objective optical system. The method is to obtain the shape of an inner cavity of the lens hood by a three-dimensional effective clear pipe composed by intercepting corresponding points on an edge contour line which is formed by the moving track of round beams of light of two reference surfaces which are connected by a straight line. In the invention, the method has the advantages of convenience, simpleness and quantification, and the designed lens hood has the minimum contour and dimension and does not shield light, thus largely restraining stray light from entering into imaging light paths directly.

Description

technical field [0001] The invention relates to an optical system stray light suppression and elimination technology, in particular to a design method for a light hood of a large field of view optical system with a pointing mirror, which is used for designing a front light hood of a telescopic objective lens optical system. Background technique [0002] Most space optical systems work in an environment with strong background light outside the field of view of the system. When the stray light is strong, if the stray light is not effectively suppressed, the non-imaging light will be received by the detector, which will cause a decrease in the signal-to-noise ratio. detection will not be possible. Among these stray lights, the stray light that directly enters the imaging optical path has a considerable impact on the signal-to-noise ratio, and the suppression of this part of light is mainly realized through the outline of the hood. Among the currently used hood designs, such as...

Claims

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Application Information

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IPC IPC(8): G02B27/00G02B23/16
Inventor 李兴隆刘辉孙小进王敬王成良李欣耀成秋丽钱婧裴云天
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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