Dr. Yunfei Du Profile

Dr. Yunfei Du

at Xi'an Institute of Optics and Precision Mechanics

SPIE Involvement:

Author

Publications (8)

Proceedings Article | 9 August 2018 Paper

Image matching algorithm with color information based on SIFT

Xiaoyong Yu, Hao Lei, Yunfei Du, Baopeng Li, Xiaobin Yuan, Wei Gao, Zongxi Song, Peiyun Zheng

Proceedings Volume 10806, 108062E (2018) https://doi.org/10.1117/12.2502820

KEYWORDS: Chromium, Image processing, RGB color model, Detection and tracking algorithms, Binary data, Electronics, Information technology, Target detection, Pollution, Lithium

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Proceedings Article | 28 February 2017 Paper

The cooling control system for focal plane assembly of astronomical satellite camera based on TEC

Yuqing He, Yunfei Du, Wei Gao, Baopeng Li, Xuewu Fan, Wengang Yang

Proceedings Volume 10256, 102562H (2017) https://doi.org/10.1117/12.2257422

KEYWORDS: Cooling systems, HVAC controls, Control systems, Astronomy, Cameras, Charge-coupled devices, CCD cameras, Control systems design, Satellites, Imaging systems

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Proceedings Article | 2 November 2016 Paper

Annular-force-based variable curvature mirror combined with multi-point actuation array to improve the surface figure accuracy: a prototype design

Hui Zhao, Xiaopeng Xie, Guorui Ren, Yunfei Du, Meiying Liu, Jingxuan Wei

Proceedings Volume 9683, 96831V (2016) https://doi.org/10.1117/12.2242256

KEYWORDS: Mirrors, Prototyping, Actuators, Distortion, Optical components, Surface finishing, Polishing, Optical imaging, Optical fabrication, Adaptive optics

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Proceedings Article | 27 September 2016 Paper

The estimation method on diffusion spot energy concentration of the detection system

Wei Gao, Zongxi Song, Feng Liu, Lijun Dan, Zhonghan Sun, Yunfei Du

Proceedings Volume 9684, 968421 (2016) https://doi.org/10.1117/12.2242811

KEYWORDS: Diffusion, Charge-coupled devices, Point spread functions, CCD image sensors, Signal to noise ratio, Observatories, Astronomy, Sensors, Statistical analysis, Optical testing

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Proceedings Article | 8 October 2015 Paper

Design and verification of focal plane assembly thermal control system of one space-based astronomy telescope

Wen-gang Yang, Xue-wu Fan, Chen-jie Wang, Ying-hao Wang, Liang-jie Feng, Yun-fei Du, Guo-rui Ren, Wei Wang, Chuang Li, Wei Gao

Proceedings Volume 9678, 96780Q (2015) https://doi.org/10.1117/12.2199517

KEYWORDS: Charge-coupled devices, Space telescopes, Telescopes, Staring arrays, Control systems design, Astronomy, Astronomical telescopes, Optical instrument design, Resistance, Satellites

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One space-based astronomy telescope will observe astronomy objects whose brightness should be lower than 23th magnitude. To ensure the telescope performance, very low system noise requirements need extreme low CCD operating temperature (lower than -65°C). Because the satellite will be launched in a low earth orbit, inevitable space external heat fluxes will result in a high radiator sink temperature (higher than -65°C). Only passive measures can’t meet the focal plane cooling specification and active cooling technologies must be utilized. Based on detailed analysis on thermal environment of the telescope and thermal characteristics of focal plane assembly (FPA), active cooling system which is based on thermo-electric cooler (TEC) and heat rejection system (HRS) which is based on flexible heat pipe and radiator have been designed. Power consumption of TECs is dependent on the heat pumped requirements and its hot side temperature. Heat rejection capability of HRS is mainly dependent on the radiator size and temperature. To compromise TEC power consumption and the radiator size requirement, thermal design of FPA must be optimized. Parasitic heat loads on the detector is minimized to reduce the heat pumped demands of TECs and its power consumption. Thermal resistance of heat rejection system is minimized to reject the heat dissipation of TECs from the hot side to the radiator efficiently. The size and surface coating of radiator are optimized to compromise heat reject ion requirements and system constraints. Based on above work, transient thermal analysis of FPA is performed. FPA prototype model has been developed and thermal vacuum/balance test has been accomplished. From the test, temperature of key parts and working parameters of TECs in extreme cases have been acquired. Test results show that CCD can be controlled below -65°C and all parts worked well during the test. All of these verified the thermal design of FPA and some lessons will be presented in this paper.

SPIE Journal Paper | 3 February 2015

Carbon-fiber-reinforced polymer variable-curvature mirror used for optical zoom imaging: prototype design and experimental demonstration

Hui Zhao, Xuewu Fan, Zhihai Pang, Guorui Ren, Wei Wang, Yongjie Xie, Zhen Ma, Yunfei Du, Yu Su, Jingxuan Wei

OE, Vol. 54, Issue 02, 025103, (February 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.2.025103

KEYWORDS: Mirrors, Actuators, Polymers, Finite element methods, Prototyping, Modulation transfer functions, Head, Optical engineering, Optical imaging, Zoom lenses

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Proceedings Article | 17 December 2014 Paper

CFRP variable curvature mirror used for realizing non-moving-element optical zoom imaging

Hui Zhao, Xuewu Fan, Zhihai Pang, Guorui Ren, Wei Wang, Yongjie Xie, Zhen Ma, Yunfei Du, Yu Su, Jingxuan Wei

Proceedings Volume 9293, 929307 (2014) https://doi.org/10.1117/12.2069856

KEYWORDS: Mirrors, Actuators, Finite element methods, Zoom lenses, Optical imaging, Prototyping, Optical components, Carbon, Fiber reinforced polymers, Zerodur

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Proceedings Article | 5 November 2014 Paper

CFRP variable curvature mirror being capable of generating a large variation of saggitus: prototype design and experimental demonstration

Hui Zhao, Xuewu Fan, Zhihai Pang, Guorui Ren, Wei Wang, Yongjie Xie, Zhen Ma, Yunfei Du, Yu Su, Jingxuan Wei, Xiaopeng Xie

Proceedings Volume 9272, 92720S (2014) https://doi.org/10.1117/12.2065554

KEYWORDS: Mirrors, Actuators, Prototyping, Finite element methods, Roads, Curium, Carbon, Fiber reinforced polymers, Precision optics, Precision mechanics

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Showing 5 of 8 publications

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