Ms. Fangfang Liu Profile

Fangfang Liu

at Beijing Institute of Space Mechanics & Electricity

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Publications (2)

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Proceedings Article | 29 March 2022 Paper

Discussion and simulation verification of optical system design method for very high-precision star sensor

Tuotuo Li, Ning An, Dong Wang, Fangfang Liu

Proceedings Volume 12169, 12169C6 (2022) https://doi.org/10.1117/12.2627189

KEYWORDS: Star sensors, Stars, Monochromatic aberrations, Chromatic aberrations, Imaging systems, Distortion, Satellites, Zemax, Optical design, Sensors

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The star sensor is an important means of satellite on-orbit attitude measurement, and its angle measurement accuracy directly determines the satellite attitude measurement accuracy. The optical system is an important part of the star sensor, and its image quality evaluation method, aberration control and optimization design method are different from the traditional imaging system. Starting from the working principle of the star sensor, this paper analyzes the main factors that affect the accuracy of angle measurement and the imaging characteristics of the energy detection system, and then puts forward the control elements and aberration correction requirements at the lens design level, and finally discusses the difference from the Programming language Method, using various operands provided by optical design software to constrain various aberration. Finally, for an optical system with a focal length of 250mm, an entrance diameter of 125mm, a field of view of 8°, and a spectral range of 400nm to 800nm, the constraint method proposed in this paper is used to optimize the design at the system level, and the finally imaging quality meets the shape of spot, centroid position deviation, enclosed energy, relative distortion, lateral chromatic aberration and other special requirements, and in the temperature range -10℃~40℃, the imaging quality is almost unchanged. The simulation results show that the optimized control method proposed in this paper has important guiding significance for the optical design of the very high-precision star sensor, and it is also suitable for energy detection systems such a point target detection system.

Proceedings Article | 27 March 2022 Paper

Design of high resolution for VIS/IR composite space optical system

Yongdan Jia, Jian Sun, fangfang Liu, guili Cao, Yunsong Nie

Proceedings Volume 12169, 121690P (2022) https://doi.org/10.1117/12.2620591

KEYWORDS: Infrared imaging, Imaging systems, Visible radiation, Infrared radiation, Modulation transfer functions, Image resolution, Cameras, Multichannel imaging systems, Optical design

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According to the need of high resolution and VIS/IR composite image, the task requirements and the necessity of spectrum selection were given. based on the analysis of the imaging mode, the design route of VIS/IR composite imaging using off-axis linear field of optical system is determined. According to the aberration auto-balance optimization of optical design software, the two channel aberrations were initially balanced. The aspheric surfaces were introduced to correct residual aberration, and the compact requirement of the composite optical system is realized. An example of the design was given, The technical indicators: The VIS channel optical system focal length is 7800mm,F number is 11.73,field of view is 2.2°×0.2°,the operating wave band is 400~900nm, the modulation transfer function of the pan-spectral is above 0.30 all over the field of view at the Nyquist frequency of 71.4lp/mm, the modulation transfer function of the multi-spectral is above 0.80 all over the field of view at the Nyquist frequency of 18lp/mm. The IR channel optical system focal length is 2500mm,F number is 3.76,field of view is 3°×0.2°,the operating wave band is 3~5μm, the modulation transfer function of the system is above 0.32 all over the field of view at the Nyquist frequency of 33lp/mm. The system can achieved the resolution 0.45m/3m at 500km orbital altitude.

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