Dr. Weijuan Qu Profile

Dr. Weijuan Qu

at Ngee Ann Polytechnic

SPIE Involvement:

Author

Publications (32)

Proceedings Article | 16 October 2019 Paper

Paper

Automatic phase aberration compensation for digital holographic microscopy based on rotation and transpose

Dingnan Deng, Weijuan Qu, Wenqi He, Xiaoli Liu, Xiang Peng

Proceedings Volume 11205, 1120505 (2019) https://doi.org/10.1117/12.2541687

KEYWORDS: Digital holography, Microscopy, Holography, Numerical analysis, Optical signal processing, Imaging systems, Biomedical optics, Phase measurement, Phase imaging

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SPIE Journal Paper | 20 March 2018

Depth profile measurement with lenslet images of the plenoptic camera

Peng Yang, Zhaomin Wang, Wei Zhang, Hongying Zhao, Weijuan Qu, Haimeng Zhao, Anand Asundi, Lei Yan

OE, Vol. 57, Issue 03, 033106, (March 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.3.033106

KEYWORDS: Microlens, Calibration, Microlens array, Optical engineering, Sensors, Error analysis, Detector arrays, Cameras, Image processing, Image resolution

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SPIE Journal Paper | 23 February 2018

Quasicommon-path digital holographic microscopy with phase aberration compensation based on a long-working distance objective

Jianglei Di, Kaiqiang Wang, Jiwei Zhang, Chaojie Ma, Teli Xi, Ying Li, Kun Wei, Weijuan Qu, Jianlin Zhao

OE, Vol. 57, Issue 02, 024108, (February 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.2.024108

KEYWORDS: Digital holography, Holograms, Holography, Mirrors, Objectives, Microscopy, Semiconducting wafers, Beam splitters, Interferometry, Optical engineering

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Proceedings Article | 24 October 2017 Paper

Paper

A reflection TIE system for 3D inspection of wafer structures

Yizhen Yan, Weijuan Qu, Lei Yan, Zhaomin Wang, Hongying Zhao

Proceedings Volume 10458, 104580H (2017) https://doi.org/10.1117/12.2283071

KEYWORDS: 3D image reconstruction, Wafer inspection, Inspection, Opacity, Phase retrieval, Microscopes

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Proceedings Article | 17 July 2015 Paper

Paper

Quantitative phase measurement for wafer-level optics

Weijuan Qu, Yongfu Wen, Zhaomin Wang, Fang Yang, Lei Huang, Chao Zuo

Proceedings Volume 9524, 95242J (2015) https://doi.org/10.1117/12.2189703

KEYWORDS: Digital holography, Phase measurement, Holograms, Wafer-level optics, Digital recording, Phase imaging, Wavefronts, Microscopes, Cameras, Inspection

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Proceedings Article | 17 July 2015 Paper

Paper

Shape measurement of micro-objects using a common-path digital holographic microscopy (CDHM) with dual wavelength

Yongfu Wen, Weijuan Qu, Zhaomin Wang, Fang Yang, Chee Yuen Cheng

Proceedings Volume 9524, 952422 (2015) https://doi.org/10.1117/12.2189619

KEYWORDS: Digital holography, Microscopy, Holography, Holograms, 3D metrology, Phase measurement, Microscopes, Objectives, Nondestructive evaluation, Molybdenum

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Proceedings Article | 17 July 2015 Paper

Paper

A quantitative phase imaging system based on transport-of-intensity equation

Fang Yang, Zhaomin Wang, Yongfu Wen, Weijuan Qu

Proceedings Volume 9524, 952424 (2015) https://doi.org/10.1117/12.2189622

KEYWORDS: Imaging systems, Cameras, Phase imaging, Phase retrieval, Human-machine interfaces, Analytical research, MATLAB, Photonics, Imaging devices, Digital holography

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Proceedings Article | 17 July 2015 Paper

Paper

Three-dimensional imaging of microstructures by an improved compact digital holographic microscope (ICDHM) with dual wavelength

Yongfu Wen, Weijuan Qu, Haobo Cheng, Anand Asundi

Proceedings Volume 9524, 95242M (2015) https://doi.org/10.1117/12.2190197

KEYWORDS: Digital holography, Holography, Microscopes, Holograms, Microelectromechanical systems, 3D image processing, 3D microstructuring, Microscopy, Charge-coupled devices, Fiber couplers

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Proceedings Article | 17 July 2015 Paper

Paper

Digital off-axis holography with angular multiplexing and synthetic aperture

Zhaomin Wang, Weijuan Qu, Fang Yang, Yongfu Wen, Asundi Anand

Proceedings Volume 9524, 95241C (2015) https://doi.org/10.1117/12.2189442

KEYWORDS: Digital holography, Multiplexing, Holograms, Cameras, Holography, Image resolution, CCD cameras, Spatial resolution, 3D image reconstruction, Molybdenum

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Proceedings Article | 12 March 2015 Paper

Paper

Phase retrieval in arbitrarily shaped aperture with the transport-of-intensity equation

Lei Huang, Chao Zuo, Mourad Idir, Weijuan Qu, Anand Asundi

Proceedings Volume 9401, 94010B (2015) https://doi.org/10.1117/12.2087754

KEYWORDS: Phase retrieval, Charge-coupled devices, Transform theory, Fourier transforms, Phase compensation, Optical alignment, Aerospace engineering, Wavefront sensors, Image acquisition, Microscopes

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Proceedings Article | 4 March 2015 Paper

Paper

Phase errors elimination in compact digital holoscope (CDH) based on a reasonable mathematical model

Yongfu Wen, Weijuan Qu, Cheeyuen Cheng, Zhaomin Wang, Anand Asundi

Proceedings Volume 9302, 930207 (2015) https://doi.org/10.1117/12.2077044

KEYWORDS: Displays, Projection systems, Modulation, Silicon, Image quality, Modulators, Electromechanical design, Image resolution, Diffraction, Mirrors

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Proceedings Article | 4 March 2015 Paper

Paper

A new phase error compensation method in digital holographic microscopy

Zhaomin Wang, Weijuan Qu, Yongfu Wen, Fang Yang, Anand Asundi

Proceedings Volume 9302, 93023M (2015) https://doi.org/10.1117/12.2076855

KEYWORDS: Digital holography, Zernike polynomials, Wavefronts, Holograms, Monochromatic aberrations, Holography, Microscopy, Optical aberrations, Digital recording, Microlens

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Proceedings Article | 4 March 2015 Paper

Paper

Two-dimensional phase unwrapping algorithms for fringe pattern analysis: a comparison study

Fang Yang, Zhaomin Wang, Yongfu Wen, Weijuan Qu

Proceedings Volume 9302, 93023F (2015) https://doi.org/10.1117/12.2081130

KEYWORDS: Speckle, Fringe analysis, Denoising, Interferometric synthetic aperture radar, Interferometry, Binary data, Photonics, Laser applications, Roads, Reconstruction algorithms

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Proceedings Article | 4 March 2015 Paper

Paper

Capability enhancement in compact digital holographic microscopy

Weijuan Qu, Yongfu Wen, Zhaomin Wang, Fang Yang, Anand Asundi

Proceedings Volume 9302, 93020I (2015) https://doi.org/10.1117/12.2081128

KEYWORDS: Digital holography, Holography, Reflection, Microscopy, Inspection, Microelectromechanical systems, Charge-coupled devices, Holograms, Optical resolution, Spherical lenses

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Proceedings Article | 19 February 2015 Paper

Paper

A new autofocus method based on angular spectrum method in digital holography

Zhaomin Wang, Weijuan Qu, Fang Yang, Yongfu Wen, Asundi Anand

Proceedings Volume 9449, 94492H (2015) https://doi.org/10.1117/12.2076853

KEYWORDS: Digital holography, Fourier transforms, Wavefronts, Computing systems, Aerospace engineering, Photonics, Holograms, Beam splitters, Laser applications, Roads

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Proceedings Article | 28 February 2014 Paper

Paper

Measurement of thermal effects in solid-state laser gain medium by digital holography

Xiaoyuan Peng, Yang Yu, Zhaomin Wang, Weijuan Qu, Chee Yuen Cheng, Saw Soon Yong, Yong Poo Chia

Proceedings Volume 8959, 895922 (2014) https://doi.org/10.1117/12.2039938

KEYWORDS: Thermal effects, Nd:YAG lasers, Digital holography, Crystals, Solid state lasers, Holograms, Laser crystals, YAG lasers, Semiconductor lasers, Rod lasers

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Proceedings Article | 22 June 2013 Paper

Paper

Single-shot quantitative phase microscopy with the transport-of-intensity equation

Chao Zuo, Qian Chen, Weijuan Qu, Anand Asundi

Proceedings Volume 8769, 876931 (2013) https://doi.org/10.1117/12.2018760

KEYWORDS: Microscopy, Spatial light modulators, Phase imaging, Cameras, Microlens, Imaging systems, Digital cameras, Free space, Free space optics, Charge-coupled devices

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Proceedings Article | 22 June 2013 Paper

Paper

Dual wavelength digital holography for improving the measurement accuracy

Jianglei Di, Weijuan Qu, Bingjing Wu, Xin Chen, Jianlin Zhao, Anand Asundi

Proceedings Volume 8769, 87690G (2013) https://doi.org/10.1117/12.2020394

KEYWORDS: Digital holography, Holograms, Microlens, 3D image reconstruction, Refractive index, Charge-coupled devices, Phase measurement, Optical testing, 3D metrology, Digital recording

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Proceedings Article | 22 June 2013 Paper

Paper

Physical phase compensation in digital holographic microscopy by using of electrical tunable lens

Weijuan Qu, Chee Yuen Cheng, Anand Asundi

Proceedings Volume 8769, 87693C (2013) https://doi.org/10.1117/12.2021092

KEYWORDS: Digital holography, Phase compensation, Wavefronts, Holography, Microscopy, Spherical lenses, Microscopes, Holograms, Objectives, Phase measurement

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Proceedings Article | 6 March 2013 Paper

Paper

High energy diode-pumped 5th harmonic generation of Nd: YAG laser

Yang Yu, Chee Yuen Cheng, Yong Poo Chia, Wee Hoong Wong, Saw Soon Yong, Weijuan Qu, Xiaoyuan Peng

Proceedings Volume 8599, 859926 (2013) https://doi.org/10.1117/12.2005830

KEYWORDS: Harmonic generation, Neodymium, YAG lasers, Ultraviolet radiation, Deep ultraviolet, Thermal effects, Diodes, Nd:YAG lasers, Energy efficiency, Laser applications

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Proceedings Article | 1 March 2013 Paper

Paper

Compound common-path digital holographic microscope

Weijuan Qu, Zhaomin Wang, Chee Yuen Cheng, Anand Asundi

Proceedings Volume 8644, 864414 (2013) https://doi.org/10.1117/12.2003755

KEYWORDS: Digital holography, Holography, Microscopes, Microscopy, Holograms, Reflection, Phase compensation, Wavefronts, Micro optics, Semiconducting wafers

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Proceedings Article | 8 May 2012 Paper

Paper

Investigation of cell morphology by the TRUImagE digital holographic microscopy system

Oi Choo Chee, Weijuan Qu, Kim Kheong Chai, Anand Asundi

Proceedings Volume 8427, 84272G (2012) https://doi.org/10.1117/12.921613

KEYWORDS: Photodynamic therapy, Digital holography, Cell death, Holography, Microscopy, Imaging systems, Plasma, 3D image processing, Microscopes, Picosecond phenomena

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Proceedings Article | 14 May 2010 Paper

Paper

Characterization and inspection of micro-lens array by SCBS microscope

Weijuan Qu, Oi Choo Chee, Yingjie Yu, Hooi Leng Ng-Lee, Ailing Tian, Anand Asundi

Proceedings Volume 7718, 77180P (2010) https://doi.org/10.1117/12.854121

KEYWORDS: Inspection, Image transmission, Digital holography, Spherical lenses, Microscopes, Interferometers, Molybdenum, Geometrical optics, Objectives, Holograms

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Proceedings Article | 15 April 2010 Paper

Paper

Digital in-line holographic microscopy at 1310 nm with superluminescent light-emitting diode broadband source

Weijuan Qu, Oi Choo Chee, Yingjie Yu, Anand Asundi

Proceedings Volume 7522, 75226M (2010) https://doi.org/10.1117/12.851401

KEYWORDS: Digital holography, Holograms, Holography, Wavefronts, Semiconducting wafers, Light emitting diodes, Charge-coupled devices, Microscopy, Semiconductors, Infrared radiation

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Proceedings Article | 15 April 2010 Paper

Paper

Physical phase compensation in digital holographic microscopy

Weijuan Qu, Oi Choo Chee, Yingjie Yu, Vijay Raj Singh, Anand Asundi

Proceedings Volume 7522, 75224P (2010) https://doi.org/10.1117/12.851399

KEYWORDS: Digital holography, Holograms, Spherical lenses, Wavefronts, Phase compensation, Molybdenum, Digital recording, Fringe analysis, Microscopes, Holography

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Proceedings Article | 3 October 2008 Paper

Paper

Phase measurement via in-line digital holographic microscopy

Weijuan Qu, Yingjie Yu, Wenjing Zhou, Hao Yan, Anand Asundi

Proceedings Volume 7155, 71550R (2008) https://doi.org/10.1117/12.814526

KEYWORDS: Holograms, Digital holography, 3D image reconstruction, Wavefronts, Charge-coupled devices, Spherical lenses, Phase measurement, Resolution enhancement technologies, Holography, Microscopy

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Proceedings Article | 25 August 2008 Paper

Paper

Ultraviolet-infrared laser-induced domain inversion in MgO-doped congruent LiNbO3 and near stoichiometric LiTaO3 crystals

Ya'nan Zhi, Weijuan Qu, De'an Liu, Jianfeng Sun, Aimin Yan, Liren Liu

Proceedings Volume 7056, 70560Y (2008) https://doi.org/10.1117/12.796343

KEYWORDS: Crystals, Laser crystals, Digital holography, Holographic interferometry, Charge-coupled devices, Phase shifts, Phase contrast, Ultraviolet radiation, Laser interferometry, Polarization

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Proceedings Article | 17 September 2007 Paper

Paper

Investigation of domain inversion and internal field in congruent lithium niobate by digital holographic interferometry

Ya'nan Zhi, De'an Liu, Weijuan Qu, Yu Zhou, Zhu Luan, Jianfeng Sun, Aimin Yan, Liren Liu

Proceedings Volume 6698, 66981I (2007) https://doi.org/10.1117/12.737812

KEYWORDS: Crystals, Holographic interferometry, Digital holography, Phase measurement, Lithium, Phase contrast, Polarization, Lithium niobate, Niobium, Holograms

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Proceedings Article | 24 August 2006 Paper

Paper

Domain inversion and electrochromism in congruent RuO2:LiNbO3 crystal

Ya'nan Zhi, De'an Liu, Weijuan Qu, Yu Zhou, Zhifang Chai, Zhu Luan, Liren Liu

Proceedings Volume 6314, 63141A (2006) https://doi.org/10.1117/12.678399

KEYWORDS: Ruthenium, Crystals, Holographic interferometry, Annealing, Digital holography, Transmittance, Ions, Electrodes, Iron, Optical testing

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Proceedings Article | 14 August 2006 Paper

Paper

Comparison of the contrast-phase map reconstruction by Fresnel transform method and the angular spectrum backward propagation algorithm in RuO₂:LiNbO₃ crystal

Weijuan Qu, Ya'nan Zhi, De'an Liu, Wei Lu, Zhijuan Hu, Chunhua Wang, Liren Liu

Proceedings Volume 6292, 62921D (2006) https://doi.org/10.1117/12.678412

KEYWORDS: Reconstruction algorithms, Crystals, Holograms, Digital holography, Holographic interferometry, Wave propagation, Fourier transforms, Charge-coupled devices, Wavefronts, 3D image reconstruction

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Proceedings Article | 14 August 2006 Paper

Paper

Phase mapping of the poling process in the RuO2:LiNbO3 crystal by digital holographic interferometry

Weijuan Qu, De'an Liu, Ya'nan Zhi, Zhu Luan, Chunhua Wang, Wei Lu, Liren Liu

Proceedings Volume 6293, 62930X (2006) https://doi.org/10.1117/12.678409

KEYWORDS: Crystals, Digital holography, Holograms, Holographic interferometry, 3D image reconstruction, Polarization, Refractive index, Geometrical optics, Charge-coupled devices, Interferometry

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Proceedings Article | 19 August 2005 Paper

Paper

The fractional Talbot effect of two-dimensional array

Weijuan Qu, Liren Liu, De'an Liu, Zu Luan, Nan Xu

Proceedings Volume 5867, 586712 (2005) https://doi.org/10.1117/12.612711

KEYWORDS: Diamond, Fiber optic illuminators, Convolution, Diffraction gratings, Diffraction, MATLAB, Optical arrays, System on a chip, Americium, Mathematics

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Showing 5 of 32 publications

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