Design of compact off-axis triple mirror optical system

Jiang Chengbin; Chen Zhili; Wang Xiaotong; Zhang Yuan; Cheng Shanshan

doi:10.12086/oee.2023.230231

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Jiang C B, Chen Z L, Wang X T, et al. Design of compact off-axis triple mirror optical system[J]. Opto-Electron Eng, 2023, 50(12): 230231. doi: 10.12086/oee.2023.230231

Citation:

Jiang C B, Chen Z L, Wang X T, et al. Design of compact off-axis triple mirror optical system[J]. Opto-Electron Eng, 2023, 50(12): 230231. doi: 10.12086/oee.2023.230231

Design of compact off-axis triple mirror optical system

School of Optoelectronic Engineering, Xi 'an Technological University, Xi 'an, Shaanxi 710021, China

More Information

^*Corresponding author: medichen@163.com

Received Date 14 September 2023

Revised Date 22 November 2023

Accepted Date 23 November 2023

Published Date 19 January 2024

Abstract

Abstract

In order to meet the requirements of miniaturization, compact structure and high resolution of the space optical systems in the fields of Earth remote sensing observation and spaceborne Lidar detection, this paper designs a compact off-axis triple inverse system based on Zernike free-form surface, which simultaneously meets the requirements of long focal length, small distortion and wide working band. The system adopts an off-axis triple inverse optical system with the asymmetric and nearly circular layout, and the third mirror of the system adopts the free-form surface design. By setting appropriate optimization objectives and methods in Zemax software, the design of the optical system is optimized. Finally, the effective focal length of the system is 800 mm, the F-number is 4, the field of view is 12°×6°, and the distortion is less than 1%. The working band covers the visible and near/middle infrared bands, and the ground element resolutions of 1.5 m (visible light) and 2.5 m (near infrared) can be achieved at the orbit height of 400 km, and the ground width is 80 km×40 km. The analysis and verification of system aberration, dot plot, MTF and other performance indexes are carried out. The results show that the design scheme brings the high resolution and improves the information acquisition ability.
- off-axis triple inverse optical system /
- space optics /
- optical system design /
- compact structure

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References

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Overview

Overview

With the continuous development of the space remote sensing technology, the resolution, operating band and compactness of the off-axis triplex optical systems have also generated the need for improvement to meet the design objectives of high resolution, broad spectrum and lightweight and compactness. Spatial optics, as the application frontier of basic science, the resolution and field of view of spatial optical systems are crucial for obtaining high-quality images in modern remote sensing technology. To address the special needs of the space remote sensing field, this research will be devoted to achieving an optimized design for lightweight and compactness, and realizing an off-axis triple-reversal structure with a near-circular layout, in order to reduce the mass and volume of the system and provide a more practical solution for applications such as satellite-mounted LIDAR detection. In order to further enhance the resolving power and information acquisition capability of the space optical system, a design scheme is proposed in this paper, which adopts a compact off-axis triple-reflector optical system with a long focal length, small aberration and a wide operating band, and the system structure adopts an asymmetric, near-circular layout of the off-axis triple-reflector optical system, which utilizes a special triple-reflector structure construction, which has been eccentrically tilted in the field of view, and designs an optical system based on even-ordered aspheric surface. On this basis, in order to improve the imaging quality and meet the design requirements, the design method of Zernike's free surface is studied, the third reflector is optimized, and finally the system is effective for a focal length of 800 mm, an F-number of 4, a field of view of 12°×6°, an aberration less than 1%, and an operating band covering the visible and the near/mid-infrared, and a geodetic resolution of 1.5 m has been achieved at the orbit altitude of 400 km. With 1.5 m ground element resolution (visible) and 2.5 m ground element resolution (near-infrared) at an orbital altitude of 400 km, and a ground width of 80 km×40 km, the system has been analyzed and verified in terms of aberration, dot-plot, MTF, and other performance indexes. And the results show that the design scheme brings high resolution capability and information acquisition capability. The analysis results show that the design scheme successfully realizes the design objectives of high resolution, wide spectrum and lightweight and small size, and meets the design requirements with the excellent resolution capability and the information acquisition capability.