Catadioptric type off-axis three-reflector long-wave infrared optical system

A long-wave infrared, optical system technology, applied in the field of systems and optical components, can solve the problems of increasing difficulty in processing and assembly, and achieve the effect of increasing the relative aperture

Inactive Publication Date: 2010-03-17
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the relative aperture of the off-axis three-mirror system, the difficulty of processing and assembly also increases

Method used

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  • Catadioptric type off-axis three-reflector long-wave infrared optical system
  • Catadioptric type off-axis three-reflector long-wave infrared optical system
  • Catadioptric type off-axis three-reflector long-wave infrared optical system

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Embodiment Construction

[0015] Attached according to the present invention figure 1 As shown in the optical system structure, we have designed a long-wave infrared optical system, the technical indicators are as follows:

[0016] Working band: 8.0μm~12.0μm

[0017] Diameter: Φ300mm

[0018] Field of view: ±2.0° (line field of view)

[0019] Off-axis three-mirror F number: F / 3.5

[0020] System F number: F / 1.2

[0021] The design results of the specific structural parameters of the system are attached, and the optical transfer function curve of the off-axis three-mirror system is shown in figure 2 , the optical transfer function curve of the system after adding the variable magnification lens group is shown in image 3 .

[0022] Design results of optical structure parameters:

[0023]

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PUM

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Abstract

The invention discloses a catadioptric type off-axis three-reflector long-wave infrared optical system for spaceborne or airborne ground observation. The optical system comprises an off-axis three-reflector system and a convertible lens group 4, wherein the off-axis three-reflector system comprises a concave reflector 1, a convex reflector 2 and a concave reflector 3; the three off-axis reflectorscan perfectly image, and the focus of each reflector is longer than the focus of the system; the convertible lens group is achromatic, and the amplification factor beta of the convertible lens groupis larger than or equal to 0.35 and less than or equal to 1; the focus of each of the three off-axis reflectors is shortened; and the relative aperture of the system is enlarged. The invention has simple structure and is mainly applied to long-wave infrared cameras in airborne or spaceborne ground imaging instruments.

Description

technical field [0001] The present invention relates to optical elements and systems, in particular to a catadioptric off-axis three-reflection, large field of view, and large relative aperture long-wave infrared optical system used in an airborne or spaceborne ground observation imager. Background technique [0002] In the long-wave infrared imaging optical system, the full transmission system is restricted by the optical material, and the general aperture is below Φ200mm. The catadioptric system generally adopts the structure of two coaxial mirrors plus a correction lens group. This structure has a central occlusion, which reduces the MTF of the system, and is not suitable for applications with a large field of view. With the increase of the relative aperture of the off-axis three-mirror system, its processing and assembly difficulty also increases. [0003] In aerospace remote sensing applications, the reflective telescope system is generally shared in multi-channel came...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B17/08G02B13/14G01S7/481
Inventor 刘银年丁学专薛永祺
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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