Dr. Shengqian Wang Profile

Dr. Shengqian Wang

at Institute of Optics and Electronics CAS

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Author

Publications (15)

Proceedings Article | 13 December 2021 Paper

Interference pattern with an analytical solution in modified Shack-Hartmann sensor

Xiaoyang Li, Xu Yang, Bincheng Li, Shengqian Wang, Hao Xian

Proceedings Volume 12070, 120700F (2021) https://doi.org/10.1117/12.2603971

KEYWORDS: Mirrors, Segmented mirrors, Fourier transforms, Sensors, Telescopes, Wavefront sensors, Mathematical modeling, Imaging systems, Adaptive optics

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Proceedings Article | 14 August 2019 Paper

Hyperspectral unmixing using double reweighted collaborative sparse regression

Yan Li, Shengqian Wang

Proceedings Volume 11179, 1117933 (2019) https://doi.org/10.1117/12.2540096

KEYWORDS: Remote sensing, Hyperspectral imaging, Optimization (mathematics), Computer simulations, Image processing

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Proceedings Article | 4 October 2016 Paper

The pyramid wavefront sensor used in the closed-loop adaptive optics system

Shengqian Wang, Kai Wei, Wenjia Zheng, Changhui Rao

Proceedings Volume 9909, 99096W (2016) https://doi.org/10.1117/12.2231944

KEYWORDS: Wavefront sensors, Adaptive optics, Large telescopes, Sensors, Liquid crystals, Deformable mirrors, Telescopes, Stars, Spatial light modulators, Observatories

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Proceedings Article | 26 July 2016 Paper

Astronomical AO in Key Laboratory of Adaptive Optics, Chinese Academy of Sciences

Changhui Rao, Kai Wei, Lei Zhu, Xuejun Zhang, Xuejun Rao, Shengqian Wang, Xiaoyu Ma, Lanqiang Zhang, Youming Guo, Ang Zhang, Hua Bao, Luchun Zhou, Mei Li, Chunlin Guan, Xiaojun Zhang, Xinlong Fan, Donghong Chen, Hao Xian, Yudong Zhang, Wenhan Jiang

Proceedings Volume 9909, 990919 (2016) https://doi.org/10.1117/12.2234256

KEYWORDS: Adaptive optics, Astronomy, Observatories, Laser development, Mirrors, Telescopes, Actuators, Imaging systems, Stars, Digital signal processing

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Proceedings Article | 27 October 2013 Paper

Image denoising via group Sparse representation over learned dictionary

Pan Cheng, Chengzhi Deng, Shengqian Wang, Chunfeng Zhang

Proceedings Volume 8919, 891916 (2013) https://doi.org/10.1117/12.2032051

KEYWORDS: Associative arrays, Image denoising, Chemical species, Reconstruction algorithms, Denoising, Image processing, Image restoration, Image quality, Signal to noise ratio, Visualization

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Proceedings Article | 15 October 2012 Paper

Study on application of spectral filter in detecting stars in daytime

Ruijin Zhang, Hao Xian, Changhui Rao, Shengqian Wang

Proceedings Volume 8419, 84190T (2012) https://doi.org/10.1117/12.974308

KEYWORDS: Optical filters, Stars, Adaptive optics, Image filtering, Wavefronts, Telescopes, Wavefront sensors, Imaging systems, Mirrors, Modulation

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Proceedings Article | 13 September 2012 Paper

Testing the pyramid wavefront sensor without modulation used in the closed-loop adaptive optics system

Shengqian Wang, Changhui Rao, Ang Zhang, Xuejun Zhang, Kai Wei, Yu Tian, Zhou Liao, Cheng Zhang, Hao Xian, Xiaojun Zhang, Ling Wei

Proceedings Volume 8447, 84476K (2012) https://doi.org/10.1117/12.925777

KEYWORDS: Modulation, Adaptive optics, Wavefront sensors, Spatial light modulators, Actuators, Wavefronts, Deformable mirrors, Turbulence, Astronomical telescopes, Mechanical engineering

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Proceedings Article | 3 December 2010 Paper

Analysis on measured signal retrieval approaches in non-modulation pyramid wavefront sensor

Jianxin Wang, Fuzhong Bai, Yu Ning, Shengqian Wang, Lanqiang Zhang

Proceedings Volume 7853, 78533G (2010) https://doi.org/10.1117/12.870698

KEYWORDS: Charge-coupled devices, Interference (communication), Signal detection, Wavefront sensors, Modulation, Wavefronts, Signal to noise ratio, Numerical simulations, Sensors, CCD image sensors

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Proceedings Article | 28 November 2007 Paper

Application of a white-light interferometric measuring system as co-phasing the segmented primary mirrors of the high-aperture telescope

Helun Song, Huaqiang Li, Hao Xian, Jian Huang, Shengqian Wang, Wenhan Jiang

Proceedings Volume 6834, 683420 (2007) https://doi.org/10.1117/12.755082

KEYWORDS: Mirrors, Interferometry, Telescopes, Image segmentation, Signal to noise ratio, Interferometers, Segmented mirrors, Optical testing, Fringe analysis, Large telescopes

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For the optical system of the telescope, with the increase in telescope size, the manufacture of monolithic primary becomes increasingly difficult. Instead, the use of segmented mirrors, where many individual mirrors (the segments) work together to provide an image quality and an aperture equivalent to that of a large monolithic mirror, is considered a more appropriate strategy. But with the introduction of the large telescope mirror comprised of many individual segments, the problem of insuring a smooth continuous mirror surface (co-phased mirrors) becomes critical. One of the main problems is the measurement of the vertical displacement between the individual segments (piston error), for such mirrors, the segment vertical misalignment (piston error) between the segments must be reduced to a small fraction of the wavelength (<100nm) of the incoming light. The measurements become especially complicated when the piston error is in order of wavelength fractions. To meet the performance capabilities, a novel method for phasing the segmented mirrors optics system is described. The phasing method is based on a high-aperture Michelson interferometer. The use of an interferometric technique allows the measuring of segment misalignment during the daytime with high accuracy, which is a major design guideline. The innovation introduced in the optical design of the interferometer is the simultaneous use of monochromatic light and multiwavelength combination white-light source in a direct method for improving the central fringe identification in the white-light interferometric phasing system. With theoretic analysis, we find that this multiwavelength combination technique can greatly increase the visibility difference between the central fringe and its adjacent side fringes, and thus it offers an increased signal resolution. So make the central fringe identification become easier, and enhance the measure precision of the segment phasing error. Consequently, it is suitable for high-precision measurement purpose and application in the segment piston error phasing system. The description about the expected interferograms and the feasibility of the phasing method are presented here.

Proceedings Article | 28 November 2007 Paper

Analysis of resolution criterion and aberrations for Fizeau interferometer

Shengqian Wang, Changhui Rao, Wenhan Jiang

Proceedings Volume 6834, 68342G (2007) https://doi.org/10.1117/12.755857

KEYWORDS: Imaging systems, Image resolution, Fizeau interferometers, Telescopes, Tolerancing, Wavefronts, Space telescopes, Spatial resolution, Mirrors, Point spread functions

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Proceedings Article | 21 November 2007 Paper

High-resolution imaging techniques based on optical synthetic aperture

Shengqian Wang, Changhui Rao, Wenhan Jiang, Helun Song

Proceedings Volume 6721, 672103 (2007) https://doi.org/10.1117/12.782677

KEYWORDS: Fizeau interferometers, Michelson interferometers, Telescopes, Space telescopes, Receivers, Fourier transforms, Modulation, Mirrors, Reconstruction algorithms, Speckle

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Proceedings Article | 21 November 2007 Paper

Design of a white-light interferometric measuring system for co-phasing the primary mirror segments of the next generation of ground-based telescope

Helun Song, Hao Xian, Wenhan Jiang, Changhui Rao, Shengqian Wang

Proceedings Volume 6721, 67210D (2007) https://doi.org/10.1117/12.782713

KEYWORDS: Mirrors, Image segmentation, Telescopes, Interferometry, Segmented mirrors, Interferometers, Error analysis, Photovoltaics, Space telescopes, Wavefronts

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Proceedings Article | 14 November 2007 Paper

Multisensor image fusion using fast discrete curvelet transform

Chengzhi Deng, Hanqiang Cao, Chao Cao, Shengqian Wang

Proceedings Volume 6790, 679004 (2007) https://doi.org/10.1117/12.747921

KEYWORDS: Image fusion, Fusion energy, Wavelet transforms, Wavelets, Remote sensing, Image enhancement, Fourier transforms, Visual system, Image information entropy, Image processing

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Proceedings Article | 20 January 2006 Paper

The influence of photovoltaic dc field on holographic correlation recognition

Guodong Liu, Jianmin Wang, Yunbo Guo, Shengqian Wang

Proceedings Volume 6027, 60272J (2006) https://doi.org/10.1117/12.668291

KEYWORDS: Crystals, Photovoltaics, Holography, Holograms, Volume holography, Optical correlators, Sodium, Laser crystals, 3D image reconstruction, Analytical research

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Proceedings Article | 15 September 2005 Paper

A novel anti-piracy optical disk with photochromic diarylethene

Guodong Liu, Guoqiang Cao, Zhen Huang, Shenqian Wang, Daowen Zou

Proceedings Volume 5966, 59662E (2005) https://doi.org/10.1117/12.649838

KEYWORDS: Data storage, Optical storage, Optical discs, Holography, Holograms, Absorption, Software development, Optical recording, Photochromic materials, Holographic data storage systems

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Showing 5 of 15 publications

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