Optical Design of Off-Axis Four-Mirror Optical System with Wide Field of View

Jun, 刘军 Liu; Wei-qi, 刘伟奇 Liu; Yusi, 康玉思 Kang; Bo, 吕博 Lü; Rui, 冯睿 Feng; Hua, 柳华 Liu; Zhong-lun, 魏忠伦 Wei

doi:10.3788/aos201333.1022002

Cited by 4 publications

(2 citation statements)

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“…Figure 7 the layout of TMA system and the MTF curve 3.3. Off-axis three-mirror system [6,7] The off-axis three-mirror system consists of three reflective mirrors with optical power and several folding mirrors. The folding mirrors are used to compress the axial size of the system, as shown in Figure 8.…”

Section: Coaxial Tma Systemmentioning

confidence: 99%

Optical design of high-resolution camera with large compression ratio

Li,

Jin,

Zhang

2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Applications of Imaging Technologies

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Obtaining high spatial resolution remote sensing images has always been one of the goals pursued in the field of remote sensing imaging. When the angular resolution of the remote sensor is constant, the closer the imaging distance, the higher the spatial resolution. For the remote sensor, the ground sample distance (GSD) at the nadir is closely related to the orbital height. Generally, the lower the orbital height, the easier it is to achieve high spatial resolution. With the rapid development of the ion thruster, spacecraft attitude adjustment technology and heat-resistant and corrosion-resistant materials, the use of ultra-low orbits to deploy micro-satellite, for earth observation and network collaborative information exchange has become an important direction in the development of aerospace technology. Based on the analysis of the development overview of typical foreign low-orbit satellites, combined with the analysis of orbit characteristics, this article summarizes the requirements of low-orbital satellites for remote sensor optical system. To meet the specific requirements, through comparative analysis of existing commonly used optical system forms, a new V-shaped high compression ratio optical system form is proposed, which greatly compresses the axial distance, and the focal length/length ratio is close to 10:1. A design example is given. Its technical specifications are as follows: focal length 4285mm, field of view angle 1.2°, F Number 8, the spectral range is 0.45 microns to 0.8 microns, the MTF value in the full field of view and the full spectrum is greater than 0.32 at the Nyquist frequency (83lp/mm), and the relative distortion is less than one ten thousandth. The simulation analysis results show that the imaging quality of the new V-shaped high compression ratio optical system proposed in this article is close to the diffraction limit, and the processing and assembly tolerance requirements are moderate. The engineering of the optical system is highly achievable, and it can well meet the application needs of low orbit.

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Section: Coaxial Tma Systemmentioning

confidence: 99%

Optical design of high-resolution camera with large compression ratio

Li,

Jin,

Zhang

2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Applications of Imaging Technologies

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“…In order to further improve time resolution，the large FOV space camera can image by side swing. At present, three kinds of large field of view space cameras have been proposed: single large FOV push-broom space camera，combined large FOV space camera composed of some push-broom sub-cameras, large FOV whiskbroom scanning space camera [3,4,5]. The large FOV whiskbroom scanning space camera is applied seldom, because of the shortcoming on reliability and imaging quality.…”

Section: Introductionmentioning

confidence: 99%

Geometric parameters analysis of two large FOV space-borne optical imaging systems

Cheng¹

2023

AOPC 2022: Optical Sensing, Imaging, and Display Technology

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To precisely calculate geometric parameters of space-borne optical imaging systems, such as object distance, projection angle, ground sampling distance(GSD), swath width, the effect of earth curvature and projection angle is researched，as nadir imaging and roll imaging. In this paper, a precise geometric model is proposed, which is based on earth curvature and projection angle. Two types of space-borne optical imaging systems are simulated by the model. They are single camera and combined camera with large field of view (FOV). They are on 644.5km orbit, with full field of view 64.44°。The analysis shows that, the GSD of combined camera changes rapidly with field angle, the maximum GSD is 2.07 times of the minimum GSD. The GSD of single camera changes less rapidly with field angle, the maximum GSD is 1.75 times of the minimum GSD. The swath widths of sub-cameras of combined camera are different. The two marginal sub-cameras have larger swath width than the two central ones. The precise calculation of geometric parameters is significative to ensure the imaging quality.

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Design of Compact Space Optical System with Large Relative Aperture and Large Field of View Based on Mangin Mirror

2021

6th International Symposium of Space Optical Instruments and Applications

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Optical Design of Off-Axis Four-Mirror Optical System with Wide Field of View

Cited by 4 publications

References 0 publications

Optical design of high-resolution camera with large compression ratio

Optical design of high-resolution camera with large compression ratio

Geometric parameters analysis of two large FOV space-borne optical imaging systems

Design of Compact Space Optical System with Large Relative Aperture and Large Field of View Based on Mangin Mirror

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