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Compact broadband spectral imaging optical system

A spectral imaging and optical system technology, applied in the field of spectral imaging optical system, wide-band light and small spectral imaging optical system, can solve the problems of difficult correction of aberrations, increase of working band, etc., to improve imaging quality, increase correction ability, improve Effect of Aberration Correction Capability

Pending Publication Date: 2020-01-17
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the increase of the working band and the increase of the field of view of the existing spectral imaging technology will lead to the difficulty of aberration correction of the system

Method used

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  • Compact broadband spectral imaging optical system
  • Compact broadband spectral imaging optical system
  • Compact broadband spectral imaging optical system

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, a compact broadband spectral imaging optical system includes an immersion primary mirror 1, a correction lens 2 and a convex grating 3; the immersion primary mirror is set as an optical element with positive power, which includes an immersion primary mirror Mirror first surface 11 and submerged primary mirror second surface 12, wherein the submerged primary mirror first surface is the object side and is set as a refraction surface, and the submerged primary mirror second surface is a reflective surface and is bent toward the object side; The convex grating is set as a reflective grating structure; the light emitted by the object surface is refracted from the first surface of the submerged primary mirror to the second surface of the submerged primary mirror after passing through the correction lens, and the light reflected by the second surface of the submerged primary mirror After passing through the correction lens, it is reflected by the con...

Embodiment 2

[0028] The radius of curvature R11 of the first surface of the submerged primary mirror and the radius of curvature R12 of the second surface of the submerged primary mirror meet the following conditions: 1.3<R12 / R11<1.42; the correction lens is set as an optical element with negative power, It includes the first surface of the correction lens and the second surface of the correction lens, the radius of curvature R21 of the first surface of the correction lens and the radius of curvature R22 of the second surface of the correction lens satisfy the following conditions: 0.77<R22 / R21<0.82; the surface curvature of the convex grating The radius R3 and the second surface curvature radius R12 of the submerged primary mirror satisfy the following condition: 0.38<R3 / R12<0.43.

[0029] The preferred solution: the immersion primary mirror 1 is an optical element with positive refractive power, which is used for converging the incident light beam on the object side and the outgoing light...

Embodiment 3

[0037] A compact broadband spectral imaging optical system based on the first embodiment, the optical system F / # is 3.4, its field of view is 28mm, the working waveband covers 400-2500nm, and the spectrum width is 4.2mm; the submerged primary mirror The specific parameters of the correction lens and the convex grating are shown in the table;

[0038]

[0039] In the embodiment, the distance between the submerged primary mirror and the correction lens is 6.113mm, and the distance between the correction lens and the convex grating is 23.04mm.

[0040] In an embodiment, the first surface of the correction lens, the second surface of the correction lens, and the first surface of the submerged primary mirror are aspheric surfaces. Its aspheric system is shown in the table below.

[0041] Coefficient B Coefficient C Coefficient D Correcting lens first surface 21 4.10e-011 3.49e-013 1.20e-016 Correcting lens second surface 22 1.72e-010 2.01e-013 2....

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Abstract

The invention belongs to the technical field of spectral imaging, and discloses a compact broadband spectral imaging optical system in order to solve the problem that aberration correction of the system is difficult due to increase of working wavebands and view fields of the existing spectral imaging technology. The compact broadband spectral imaging optical system comprises an immersed primary mirror, a correction lens and a convex-surface grating, wherein the immersed primary mirror is set to be an optical element with positive focal power and comprises a first surface and a second surface,the first surface is an object side and is set to be a refraction surface, and the second surface is a reflection surface and bends to the object side; and a reflective grating structure is arranged on the convex-surface grating. The working waveband of the compact broadband spectral imaging optical system covers a range from visible light to short-wave infrared rays, and the is compact in size and structure.

Description

technical field [0001] The invention belongs to the technical field of spectral imaging, and relates to a spectral imaging optical system, in particular to a wide-band light and small spectral imaging optical system. Background technique [0002] Spectral imaging technology can simultaneously obtain the spatial information and spectral information of the scene, which has the advantage of "integrating map and spectrum", and is widely used in remote sensing detection, mineral exploration, environmental monitoring, smart agriculture, food safety and other fields. According to the different ways of splitting light, spectral imaging systems can usually be divided into two types: dispersion type and interference type. According to the different light-splitting elements used, the dispersion type can be divided into two types: prism type and grating type. The grating spectral imaging system based on the Offner structure has the advantages of large relative aperture, small distortio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/02G01J3/28G02B17/08
CPCG01J3/0208G01J3/0297G01J3/2823G02B17/08
Inventor 陈新华杨福臻沈为民
Owner SUZHOU UNIV
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