Prof. Nai-Keng Bao Profile

Prof. Nai-Keng Bao

Associate Professor at City Univ of Hong Kong

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Author

Publications (17)

Proceedings Article | 10 May 2005 Paper

Etching error analysis of dot grating array in microlithography fabrication

N. Bao, Z. Chen

Proceedings Volume 5752, (2005) https://doi.org/10.1117/12.598161

KEYWORDS: Error analysis, Electron beam lithography, Binary data, Optical components, Etching, Optical design, Lithography, Optical lithography, Statistical analysis, Profilometers

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Proceedings Article | 12 April 2005 Paper

Calculation of Fourier holographic storage density

Zhongyu Chen, N. K. Bao, Po S. Chung

Proceedings Volume 5852, (2005) https://doi.org/10.1117/12.621522

KEYWORDS: Holography, Spatial light modulators, Holograms, 3D image reconstruction, Digital holography, Optical discs, Data storage, Signal to noise ratio, Binary data, Optical storage

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SPIE Journal Paper | 1 October 2004

Adjacent sequence iteration method for designing a diffractive element with function of long focal depth

Nai-Keng Bao, Zhongyu Chen, Yansong Chen

OE, Vol. 43, Issue 10, (October 2004) https://doi.org/10.1117/12.10.1117/1.1787530

KEYWORDS: Diffractive optical elements, Optical design, Optical components, Semiconductor lasers, Wavefronts, Laser beam propagation, Wave propagation, Light wave propagation, Optical engineering, Axicons

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Proceedings Article | 15 September 2004 Paper

The anti-counterfeiting hologram of encryption processing in frequency domain

Nai Bao, Zhongyu Chen

Proceedings Volume 5403, (2004) https://doi.org/10.1117/12.543384

KEYWORDS: Holograms, Diffraction gratings, Digital holography, Diffraction, Fourier transforms, Modulation, Image processing, Computer generated holography, Homeland security, Computer programming

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Proceedings Article | 29 May 2002 Paper

Frequency coding applied for fingerprint classification

Nai-Keng Bao, B. Li

Proceedings Volume 4537, (2002) https://doi.org/10.1117/12.468858

KEYWORDS: Fingerprint recognition, Prisms, Fourier transforms, Sensors, Image segmentation, Feature extraction, Scientific classification systems, Electronics engineering, Spectrum analysis, Image processing

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Proceedings Article | 19 April 2002 Paper

Encryption techniques to the design of e-beam-generated digital pixel hologram for anti-counterfeiting

Hau Chan, Nai-Keng Bao, Wing Kwok, Wing Wong

Proceedings Volume 4677, (2002) https://doi.org/10.1117/12.462718

KEYWORDS: Digital holography, Image encryption, Holograms, Optical design, Diffraction, Electron beam lithography, Lithium, Spectral resolution, Resistance, Fabrication

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Proceedings Article | 13 June 2001 Paper

Digital speckle correlation method with compensation technique for strain field measurements

Guan-chang Jin, Zhen Wu, Nai-Keng Bao, Xuefeng Yao

Proceedings Volume 4317, (2001) https://doi.org/10.1117/12.429568

KEYWORDS: Speckle, Wavelets, Wavelet transforms, Algorithm development, Denoising, Software development, Interference (communication), Optical signal processing, Stress analysis, Signal processing

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Proceedings Article | 13 June 2001 Paper

Optical information coding and decoding techniques for photomechanics

Bang-Yi Li, Nai-Keng Bao, Yi-Nan Wei

Proceedings Volume 4317, (2001) https://doi.org/10.1117/12.429614

KEYWORDS: Fringe analysis, Digital imaging, Teeth, Computing systems, Phase shift keying, Spatial frequencies, Image processing, Image compression, Picosecond phenomena, Holographic interferometry

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Proceedings Article | 17 March 2000 Paper

Digital pixel cryptogram in e-beam holography

Tianji Wang, Yaotang Li, Shining Yang, Hongan Feng, Shichao Zhang, Shaowu Fan, Nai-Keng Bao, Wai-Him Wong, Hau Chan, Po Sheun Chung

Proceedings Volume 3956, (2000) https://doi.org/10.1117/12.379992

KEYWORDS: Digital holography, Holograms, Electron beam lithography, Diffraction gratings, Holography, Lithography, Computer programming, Diffraction, Data conversion, Laser systems engineering

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Proceedings Article | 20 March 1997 Paper

Applications of optical fiber techniques to optical metrology

Nai-Keng Bao, Guan-chang Jin, Po Sheun Chung

Proceedings Volume 2921, (1997) https://doi.org/10.1117/12.269821

KEYWORDS: Optical fibers, Optical metrology, Polarization, 3D metrology, Modulators, Nondestructive evaluation, Optical communications, Birefringence, Speckle pattern, Fringe analysis

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Proceedings Article | 20 March 1997 Paper

Advanced digital speckle correlation method for strain measurement and nondestructive testing

Guan-chang Jin, Nai-Keng Bao, Po Sheun Chung

Proceedings Volume 2921, (1997) https://doi.org/10.1117/12.269878

KEYWORDS: Nondestructive evaluation, Speckle, Optical metrology, Speckle pattern, Optical fibers, Mechanics, Lenses, Algorithm development, Metals, Solids

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Proceedings Article | 2 August 1995 Paper

Optical metrology for small zone measurement

Guan-chang Jin, Nai-Keng Bao, Po Sheun Chung

Proceedings Volume 2576, (1995) https://doi.org/10.1117/12.215625

KEYWORDS: Optical metrology, Critical dimension metrology, Speckle, Interferometry, Speckle pattern, Optical fibers, Lenses, Optical testing, Nondestructive evaluation, Microscopes

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Proceedings Article | 24 April 1995 Paper

Programmable binary optical elements using CRT liquid crystal light valve (LCLV) spatial modulator

Nai-Keng Bao, Tianji Wang, Po Sheun Chung

Proceedings Volume 2408, (1995) https://doi.org/10.1117/12.207504

KEYWORDS: Spatial light modulators, Binary data, Optical components, Liquid crystals, Light valves, Fresnel lenses, CRTs, Modulators, Molecules, Glasses

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Proceedings Article | 28 March 1995 Paper

Thermographic nondestructuve testing (NDT) technique for delaminated defects in composite structures

Yuwen Qin, Nai-Keng Bao

Proceedings Volume 2473, (1995) https://doi.org/10.1117/12.204858

KEYWORDS: Composites, Nondestructive evaluation, Inspection, Thermography, Infrared radiation, Image processing, Computing systems, Aluminum, Defect detection, Structured optical fibers

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SPIE Journal Paper | 1 August 1994

Applications of a novel phase-shift method using a computer-controlled polarization mechanism

Guan-chang Jin, Nai-Keng Bao, Po Sheun Chung

OE, Vol. 33, Issue 08, (August 1994) https://doi.org/10.1117/12.10.1117/12.173565

KEYWORDS: Polarizers, Polarization, Phase shifts, Interferometry, Fringe analysis, 3D metrology, Speckle pattern, Nondestructive evaluation, Prisms, Error analysis

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Proceedings Article | 22 October 1993 Paper

New computer-controlled polarization phase-shifting technique

G. Jin, Nai-Keng Bao, Po Sheun Chung

Proceedings Volume 2066, (1993) https://doi.org/10.1117/12.162092

KEYWORDS: Polarization, Phase shifts, Polarizers, 3D metrology, Interferometry, Fringe analysis, Nondestructive evaluation, 3D image processing, Image processing, Speckle pattern

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Proceedings Article | 22 October 1993 Paper

New electronic shearing speckle pattern interferometer with continuously variable sensitivity

Nai-Keng Bao, G. Jin, Po Sheun Chung

Proceedings Volume 2066, (1993) https://doi.org/10.1117/12.162091

KEYWORDS: Nondestructive evaluation, Fringe analysis, Prisms, Speckle pattern, Interferometers, Image processing, Lenses, Optical sensing, Metrology, Cameras

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Showing 5 of 17 publications

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