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A large-aperture secondary imaging r-c optical system

A secondary imaging and optical system technology, applied in the field of infrared imaging, can solve the problems of multiple stray light and the inability to meet the efficiency of cold diaphragm

Inactive Publication Date: 2017-02-08
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If only the R-C optical system is used, the efficiency of the cold diaphragm cannot be 100%, and more stray light will be introduced

Method used

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  • A large-aperture secondary imaging r-c optical system
  • A large-aperture secondary imaging r-c optical system
  • A large-aperture secondary imaging r-c optical system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A large-aperture secondary imaging R-C optical system, the R-C optical system is sequentially provided with a hyperboloid mirror 1, an aperture stop 2, a field stop 3, a secondary transfer lens group 4 and a cold stop 5, and all mirror surfaces Coaxial setting, hyperboloid reflector 1, aperture stop 2, and field stop 3 form a primary imaging system to achieve primary imaging convergence for external scenes. The converging surface is located on the field stop 3, and the secondary transfer lens group 4 The secondary imaging system is composed of the cold diaphragm 5, and the secondary imaging is performed on the converging light plane of the field diaphragm 3, and the obtained spectral imaging is located on the image plane 6.

[0043] The secondary image conversion lens group 4 includes four lenses, viewed from the direction of the field stop 3 to the cold stop 5, the first meniscus lens 7, the second meniscus lens 8, the biconcave lens 9 and the biconvex lens 10, The fie...

Embodiment 2

[0065] A large-aperture secondary imaging R-C optical system, the R-C optical system is sequentially provided with a hyperboloid mirror 1, an aperture stop 2, a field stop 3, a secondary transfer lens group 4 and a cold stop 5, and all mirror surfaces Coaxial setting, hyperboloid reflector 1, aperture stop 2, and field stop 3 form a primary imaging system to achieve primary imaging convergence for external scenes. The converging surface is located on the field stop 3, and the secondary transfer lens group 4 The secondary imaging system is composed of the cold diaphragm 5, and the secondary imaging is performed on the converging light plane of the field diaphragm 3, and the obtained spectral imaging is located on the image plane 6.

[0066] The secondary image conversion lens group 4 includes four lenses, viewed from the direction of the field stop 3 to the cold stop 5, the first meniscus lens 7, the second meniscus lens 8, the biconcave lens 9 and the biconvex lens 10, The fie...

experiment example

[0088] Taking Embodiment 46 as an example, the optical path diagram of the infrared detection optical system in the ZEMAX software is as follows image 3 as shown, Figure 4 It is the enlarged picture of the secondary relay lens group. After the first imaging of the two-mirror R-C system, the second imaging is performed. The exit pupil of the imaging system coincides with the cold screen, so that the entrance pupil of the primary mirror and the cold diaphragm are in common The yoke can better suppress stray radiation and improve the signal-to-noise ratio.

[0089] Figure 5 In order to complete the modulation transfer function diagram of the designed infrared detection optical system, the function value fully reflects the design and evaluation results of the system. With the increase of the field of view, the modulation transfer function value is gradually decreasing. Among them, the modulation transfer function value of the edge field of view is still better than 0.48, indi...

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Abstract

The invention discloses a large-diameter secondary imaging R-C optical system. The R-C optical system is sequentially provided with a hyperboloid reflector, an aperture stop, a field stop, a secondary transfer lens group and a cold stop. , all the mirrors are coaxially set, the hyperboloid reflector, the aperture stop, and the field stop form a primary imaging system, which realizes primary imaging convergence for the external scene, and the converging surface is located on the field stop, and the secondary transfer lens group and cold light The diaphragm constitutes a secondary imaging system, which performs secondary imaging on the converging light plane of the field diaphragm, and the obtained spectral imaging is located on the image plane. Compared with the prior art, the present invention performs the second imaging after the first imaging of the two-mirror R-C system by adding a field of view diaphragm and a secondary transfer lens group, and the exit pupil of the imaging system coincides with the cold screen, The entrance pupil located in the primary mirror and the cold diaphragm are conjugated to each other, which suppresses stray radiation better and improves the signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of infrared imaging, and in particular relates to a large-aperture secondary imaging R-C optical system. Background technique [0002] Ordinary optical glass is opaque in the infrared band, and a few glasses can transmit wavelengths below 3 μm. For the objective lens used in the mid-to-far infrared band, it needs to be made of special infrared optical materials. On the other hand, in order to collect more radiation energy, the aperture of the objective lens is often made very large. At present, although there are some kinds of materials in the infrared band, their performance and molding size cannot fully meet the requirements of use. Sometimes it is difficult to select suitable materials to eliminate the chromatic aberration in the band. Therefore, the reflective type is mostly used in the current infrared optical system. [0003] When an infrared detection system detects a weak target, in order to obtai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00
CPCG02B27/0081
Inventor 牛金星李恒灿
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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