Dr. Gengyao Zhang Profile

Dr. Gengyao Zhang

at Chinese Academy of Sciences

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Proceedings Article | 5 November 2020 Paper

Optical design of space debris detection system with wide field of view

Gengyao Zhang, Xuewu Fan, Zixuan Ma, Guang Qin

Proceedings Volume 11570, 1157004 (2020) https://doi.org/10.1117/12.2574684

KEYWORDS: Target detection, Tolerancing, Imaging systems, Satellites, Signal to noise ratio, Optical design, Monochromatic aberrations, Lenses, Astronomical imaging

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At present, the frequency of human space activities continues to increase, resulting in more and more space debris, which poses a great threat to the working satellite. The collision of debris and satellites may cause abnormal operation of the satellite or even complete damage. Based on the 3u cubic satellite platform, this paper has designed a miniaturized visible light detection system with a full field of view of 12° (9°×7°). the wavelength band of the system is 450 ~ 800nm, the pixel size of the detector is 5μm, the entrance pupil diameter is 60mm, the system focal length is 150mm, the detection system is composed of 8 lenses. Using optical design software to evaluate the image quality of the optical system, the results show that the diffusion spots in each field of view are approximately circular, the maximum RMS radius is less than 7.4 μm, and the energy distribution in each field of view is more than 80% within 3 × 3 pixels, field curvature, distortion all meet the requirements of the detection system. Finally, the tolerance analysis results show that the design has good imaging quality and meets the system performance requirements and machining requirements. The visible light detection system has a large field of view, light weight, low processing cost and high energy concentration. and can meet the demand for space debris detection in Earth orbit.

Proceedings Article | 5 November 2020 Paper

Design of a zoom projection optical system for high resolution projector

Guang Qin, Xuewu Fan, Zixuan Ma, Gengyao Zhang

Proceedings Volume 11565, 1156508 (2020) https://doi.org/10.1117/12.2579880

KEYWORDS: Zoom lenses, Objectives, Projection systems, Display technology, Digital micromirror devices, Tolerancing, Distortion, Optical design, Modulation transfer functions

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With the rapidly development of optoelectronic technology and computer technology, the projection display technology has also been unprecedentedly developed. In this paper, a zoom projection objective lens is designed based on Digital Light Processing (DLP) projection display technology, the 0.47in DMD chip of Texas Instruments is selected in this paper, its resolution is 1920×1080 and its micromirror pitch is 5.4 μm. The optical system uses a 100% offset transmissive projection structure. The working wavelength of the whole zoom projection lens is visible light, and 14 lenses including protective glass are used for the projection lens, each lens in the designed system is spherical, the total length of the system is 220mm, the aperture of the optical system is about 58mm , focal length of the zoom projection lens ranges from 25mm to 32 mm, viewing angle ranges from 41 degree to 51 degree , and F number is 1.7 , the distortion of the designed system is less than 3%, the projected image plane relative illumination of the zoom projection lens above 90% , the telecentricity of the system is less than 1 degree. The MTF value is close to 0.3 at the Nyquist frequency 93 lp/mm for the full field of view, the designed system meet the requirements of projection. In order to meet the current processing level, the radius of curvature tolerance, the spacing tolerance, the eccentricity tolerance and the tilt tolerance are analyzed. The results show that the zoom projection lens is easy to process and produce.

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