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Off-axis three-mirror optical system based on correction plate

An off-axis three-mirror and optical system technology, applied in optics, optical components, instruments, etc., can solve problems such as poor correction of off-axis aberration, influence of optical system transfer function, system center occlusion, etc., to improve optical Component utilization, short processing cycle, and the effect of improving image quality

Active Publication Date: 2021-08-27
NANJING NAIERSI PHOTOELECTRIC INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the structure of the two-reflection system is simple, but there are few degrees of freedom, and the off-axis aberration cannot be well corrected.
The three-reflection system is composed of three aspherical surfaces, with more degrees of freedom and good imaging quality when the field of view is large. However, the conventional three-reflection system expands the field of view in one direction instead of X and Y directions at the same time. It is very large, that is, the conventional wide off-axis three-mirror system
However, the traditional Schmidt system is composed of a Schmidt correction plate and a mirror, which belongs to the coaxial reflection system, and there is a large block in the center of the system, which has a certain influence on the transfer function of the optical system

Method used

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  • Off-axis three-mirror optical system based on correction plate
  • Off-axis three-mirror optical system based on correction plate
  • Off-axis three-mirror optical system based on correction plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Optical system design indicators are as follows:

[0044] Effective caliber: 200mm;

[0045] Optical field of view: full field of view 5°;

[0046] System focal length: 2000mm;

[0047] Image quality: MTF at the Nyquist frequency is greater than 0.3, and the MTF curve of the optical system is as follows figure 2 shown;

[0048] Working band: 0.74um~18um.

[0049] The structural representation of the 200mm aperture optical system is as follows figure 1 As shown, the optical system includes a Schmidt correction plate 1 , a primary mirror 2 , a secondary mirror 3 , a third mirror 4 and a focal plane 5 . Wherein, according to the incident direction of the light, from left to right, the light passes through the Schmidt correction plate 1, the primary mirror 2, the secondary mirror 3, the third mirror 4 and the focal plane 5 in sequence. The high-order aspheric surface of the Schmidt correction plate can compensate the off-axis aberration, so that the off-axis aberrati...

Embodiment 2

[0055] Large field of view broadband optical system, refer to image 3: Optical design indicators are as follows:

[0056] Diameter: 200mm;

[0057] Full field of view: 8°;

[0058] Focal length: 2000mm;

[0059] Image quality: MTF at the Nyquist frequency is greater than 0.3, and the MTF curve of the wide-band optical system with large field of view is as follows Figure 4 shown;

[0060] Working band: 0.55um~18um.

[0061] The optical system includes a Schmidt correction plate 1 (composed of two pieces), a primary mirror 2 , a secondary mirror 3 , a third mirror 4 and a focal plane 5 . Wherein, according to the incident direction of the light, from left to right, the light passes through the Schmidt correction plate 1, the primary mirror 2, the secondary mirror 3, the third mirror 4 and the focal plane 5 in sequence. The high-order aspheric surface of the two Schmidt correction plates can compensate the off-axis aberration of a larger field of view, so that the off-axi...

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Abstract

The invention discloses an off-axis three-mirror optical system based on a correction plate. The off-axis three-mirror optical system comprises a Schmidt correction plate, a primary mirror, a secondary mirror, a third mirror and a focal plane, the Schmidt correction plate is perpendicular to the optical axis of incident light, and the light sequentially passes through the Schmidt correction plate, the primary mirror, the secondary mirror and the third mirror to reach the focal plane; the Schmidt correction plate, the primary mirror, the secondary mirror, the third mirror and the focal plane share the same optical axis; the Schmidt correction plate, the primary mirror and the secondary mirror are arranged on one side of the optical axis; and one surface of the Schmidt correction plate is a plane, and the other surface of the Schmidt correction plate is a non-focal-power aspheric surface. According to the off-axis three-mirror optical system based on the correction plate of the invention, the Schmidt correction plate is added in a traditional off-axis three-mirror system, so that the field of view of the off-axis three-mirror system is further expanded, and the imaging resolution is improved; the added Schmidt correction plate not only can compensate large-view-field off-axis aberration, but also can be used as system window sealing glass, so that the correction type off-axis three-mirror system is more compact in structure.

Description

technical field [0001] The invention belongs to the field of optical design, in particular to an off-axis three-mirror optical system based on a correction plate. Background technique [0002] Wide-band, large field of view optical system can obtain high-definition photos of infinity targets in aerospace space reconnaissance and space observation, and can be widely used in modern industry or airborne remote sensing. favored by the department. [0003] For wide-band, large-field imaging optical systems, refractive optical systems need to use special optical materials or complex structures to eliminate secondary spectra, and it is difficult to ensure the uniformity of lens materials when the aperture is too large. These factors affect the final imaging of the object quality. The total reflection optical system is not affected by chromatic aberration, the lens material is easy to obtain, and the aperture can be made larger, which is an ideal structure for a large-aperture bro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B17/06G02B27/00
CPCG02B17/0636G02B17/0668G02B27/0025
Inventor 董云芬张盈盈
Owner NANJING NAIERSI PHOTOELECTRIC INSTR
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