Dr. Dawei Wang Profile

Dr. Dawei Wang

at Harbin Institute of Technology

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Publications (7)

Proceedings Article | 7 March 2019 Paper

Misalignment recognition of mass pan in joule balance

Yang Bai, Yunfeng Lu, Zhengkun Li, Dawei Wang, Qing He, Zhonghua Zhang

Proc. SPIE. 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation

KEYWORDS: Metrology, Retroreflectors, Electromagnetism, Standards development

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Proceedings Article | 19 October 2016 Paper

Study on methods of shape optimization and design of membrane mirror

Su Han, Fanjiao Tan, Dawei Wang

Proc. SPIE. 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation

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Based on the Karman’s equation for circular thin plate and Qian’s theory of membrane, the membrane mirror forming theory model is established. The effect of the high order disturbance for the shape of the membrane mirror is reduced by the way of variable thickness, so that the shape of the membrane is parabolic. The finite element method is used to verify the theory of the membrane mirror forming model. But the analysis results are not easy to convergence due to the flexibility characteristics of the membrane. So the reasonable solution parameters are necessary to ensure the correction of the finite element analysis result. The results show that the deviation between the finite element analysis and the theoretical results is small. The uniform thickness deviation is 0.73%, and the variable thickness deviation is 1.30%, thus the validity of the theoretical model is guaranteed. Then the membrane mirror design and optimization method is established on the basis of the theoretical model. Compare the theoretical surface and the optical design surface, and set the minimum root mean square error between the theoretical and the optical design surface as the optimization goal. The original shape and the surface shape control parameters of the membrane are optimized by using genetic algorithm. Finally, get the optimization model which can be used to optimize membrane mirror with any diameter. The genetic algorithm was used to optimize the thickness, boundary condition and the uniform loads. The result of membrane mirror accuracy is λ/4(λ=10um), which indicates that this membrane mirror can be applied in the infrared wavelength range for imaging. The main optimizing parameters are the variable thickness of the membrane, the boundary conditions and the surface loads. Finally, the optimization result of the membrane is the RMS<λ/4(λ=10μm), which indicates that the membrane can be used to long-wave infrared optical system. Based on the theory of mechanics of materials, this paper establishes a theoretical model and analyzes the relationship between the inflatable membrane mirror and the boundary conditions as well as the gas load. And the optimization design method is carried out for space-based optical applications. The model and method established in this paper is of great significance for the design and application of large optical payload based on the membrane mirror.

Proceedings Article | 19 October 2016 Paper

Cryogenic performance of the space infrared optical payload

Dawei Wang, Fanjiao Tan, Wei Zhang, Mingdong Liu, Haipeng Wang

Proc. SPIE. 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation

KEYWORDS: Zernike polynomials, Infrared radiation, Modulation transfer functions, Astronomical imaging, Optical cryogenics, Cryogenics

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SPIE Journal Paper | 24 November 2015

Satellite modulation transfer function estimation from natural scenes

Xiyang Zhi, Wei Zhang, Sun Xuan, Wang Dawei

OE Vol. 54 Issue 11

KEYWORDS: Modulation transfer functions, Satellites, Satellite imaging, Earth observing sensors, Statistical analysis, Motion models, Point spread functions, Optical engineering, Image analysis, Fractal analysis

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Proceedings Article | 24 November 2014 Paper

Degradation and restoration of high resolution TDICCD imagery due to satellite vibrations

Xiyang Zhi, Qingyu Hou, Xuan Sun, Wei Zhang, Liyuan Li

Proc. SPIE. 9301, International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition

KEYWORDS: Cameras, Satellites, Image processing, Image restoration, Image resolution, Distortion, Satellite imaging, Image quality, Motion models, Electro optical modeling

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Proceedings Article | 24 November 2014 Paper

Identification method of satellite local components based on combined feature metrics

Xi-yang Zhi, Qing-yu Hou, Wei Zhang, Xuan Sun

Proc. SPIE. 9301, International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition

KEYWORDS: Satellites, Image processing, Solar cells, Feature extraction, Satellite imaging, Fractal analysis, Antennas, Particle swarm optimization, Target recognition, Earth observing sensors

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Proceedings Article | 18 November 2014 Paper

A method on lightweight for the primary mirror of large space-based telescope based on neural network

Dawei Wang, Shuqing Zhang, Fanjiao Tan, Xiyang Zhi, Yongqiang Chu, Hongdi Lv, Rongkai Zhen

Proc. SPIE. 9298, International Symposium on Optoelectronic Technology and Application 2014: Imaging Spectroscopy; and Telescopes and Large Optics

KEYWORDS: Mathematical modeling, Telescopes, Mirrors, Data modeling, Space telescopes, Finite element methods, Neural networks, Lightweight mirrors, Mirror structures, Neurons

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Showing 5 of 7 publications

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