Dr. Liping Zhao Profile

Dr. Liping Zhao

Senior Research Engineer at Singapore Institute of Manufacturing Technology

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Author

Publications (29)

Proceedings Article | 7 March 2019 Paper

Process optimization: internal feature measurement for additive-manufacturing parts using x-ray computed tomography

Dawei Xu, Fang Cheng, Yu Zhou, Thaddie Matalaray, Pei Xian Lim, Liping Zhao

Proceedings Volume 11053, 110530H (2019) https://doi.org/10.1117/12.2511429

KEYWORDS: Diffractive optical elements, X-rays, X-ray computed tomography, Surface roughness, Spatial resolution, Metrology, Additive manufacturing, Statistical analysis, 3D metrology, Optical filters

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Proceedings Article | 22 June 2013 Paper

Dynamic focal spots registration algorithm for freeform surface measurement

Wenjiang Guo, Liping Zhao, I-Ming Chen

Proceedings Volume 8769, 876911 (2013) https://doi.org/10.1117/12.2021107

KEYWORDS: Image registration, Wavefront sensors, Sensing systems, Wavefronts, Diffraction, Reconstruction algorithms, Metrology, Image analysis, Charge-coupled devices, Aerospace engineering

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Proceedings Article | 22 June 2013 Paper

Toroidal surface measurement with elliptical lenslet array

Wenjiang Guo, Liping Zhao, I-Ming Chen

Proceedings Volume 8769, 87690A (2013) https://doi.org/10.1117/12.2021097

KEYWORDS: Spatial light modulators, Spherical lenses, Wavefront sensors, Radio frequency weapons, Wavefronts, Optics manufacturing, Error analysis, Metrology, Optical testing, Numerical simulations

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Proceedings Article | 17 June 2009 Paper

Inspection of misalignment factors in lens assembly

Xiang Li, Liping Zhao, Zhong Ping Fang

Proceedings Volume 7390, 739006 (2009) https://doi.org/10.1117/12.827446

KEYWORDS: Zinc, Wavefronts, Zernike polynomials, Wavefront sensors, Inspection, Optics manufacturing, Optical components, Light wave propagation, Helium neon lasers, Zemax

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Proceedings Article | 17 June 2009 Paper

Sensing performance of a Shack Hartmann wavefront sensor versus the properties of the light beam

L. Zhao, W. Guo, X. Li, Z. Zhong

Proceedings Volume 7390, 73900E (2009) https://doi.org/10.1117/12.827327

KEYWORDS: Wavefront sensors, Wavefronts, Charge-coupled devices, Sensors, Spherical lenses, Optical simulations, Refractive index, MATLAB, Sensing systems, Computer simulations

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Proceedings Article | 3 October 2008 Paper

Measurement of human embryonic stem cell in the growing cycle

X. Li, L. Zhao, Steve K. W. Oh, W. K. Chong, J. K. Ong, Allen Chen, Andre B. H. Choo

Proceedings Volume 7155, 715535 (2008) https://doi.org/10.1117/12.814615

KEYWORDS: Stem cells, Light sources and illumination, Calibration, Microscopes, Imaging systems, Light emitting diodes, Image processing, Inspection, 3D metrology, Manufacturing

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Proceedings Article | 3 October 2008 Paper

Investigation of light scattering for scratch detection

Z. W. Zhong, L. P. Zhao, L. J. Wang

Proceedings Volume 7155, 71552W (2008) https://doi.org/10.1117/12.814606

KEYWORDS: Light scattering, Polarization, Polarizers, Optical testing, Scatter measurement, Defect detection, Laser scattering, Scattering, Sensors, Optics manufacturing

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Proceedings Article | 3 October 2008 Paper

The interaction performance of white light, laser diode, and He-Ne laser with two wavefront sensing systems

Z. W. Zhong, L. P. Zhao, A. A. Hein

Proceedings Volume 7155, 71552X (2008) https://doi.org/10.1117/12.814607

KEYWORDS: Sensing systems, Light sources, Helium neon lasers, Semiconductor lasers, Wavefront sensors, CCD cameras, Image processing, Light, CMOS cameras, Wavefronts

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Proceedings Article | 3 October 2008 Paper

Surface measurement with Shack-Hartmann wavefront sensing technology

X. Li, L. P. Zhao, Z. P. Fang, A. Asundi, X. M. Yin

Proceedings Volume 7155, 715515 (2008) https://doi.org/10.1117/12.814541

KEYWORDS: Wavefronts, Wavefront sensors, Optical design, Wave propagation, Spherical lenses, Image processing, Manufacturing, Bridges, Optical components, Light sources

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Proceedings Article | 18 June 2007 Paper

Digital Shack-Hartmann Wavefront Sensor for toroidal surface measurement

N. Bai, Li. P. Zhao, X. Li, Zhong Fang

Proceedings Volume 6616, 661644 (2007) https://doi.org/10.1117/12.726057

KEYWORDS: Spatial light modulators, Microlens array, Wavefront sensors, Spherical lenses, Wavefronts, Geometrical optics, Sensors, Optical testing, Surface finishing, Optical design

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Proceedings Article | 18 June 2007 Paper

Special lenslet array with long focal length range for Shack-Hartmann Wavefront Sensor

L. P. Zhao, N. Bai, X. Li, Z. P. Fang, A. A. Hein, Z. W. Zhong

Proceedings Volume 6616, 66161O (2007) https://doi.org/10.1117/12.726043

KEYWORDS: Wavefront sensors, Sensing systems, Charge-coupled devices, Spatial light modulators, CCD image sensors, Image sensors, Sensors, Wavefronts, Manufacturing, Staring arrays

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Proceedings Article | 12 April 2005 Paper

In situ inspection of inclusions in toughened glass panels of high-rise buildings

Xiang Li, Zhong Ping Fang, Ivan Reading, Liping Zhao, Siew Loong Chow

Proceedings Volume 5852, (2005) https://doi.org/10.1117/12.621451

KEYWORDS: Glasses, Nickel, Inspection, Buildings, Light scattering, Refractive index, Heat treatments, Raman spectroscopy, Microscopes, Reflection

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Proceedings Article | 14 February 2005 Paper

Contact analysis of transversally loaded Bragg grating strain sensors

Jinu Paul, L. Zhao, Bryan Ngoi

Proceedings Volume 5776, (2005) https://doi.org/10.1117/12.611664

KEYWORDS: Fiber Bragg gratings, Polymers, Coating, Sensors, Birefringence, Wavelength tuning, Reflectivity, Refractive index, Cobalt, Optical fibers

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Proceedings Article | 7 December 2004 Paper

Novel fiber optic sensor for grip testing

Li Ping Zhao, Zhong Ping Fang, Jinu Paul, Bryan Ngoi, Jun Hong Ng

Proceedings Volume 5588, (2004) https://doi.org/10.1117/12.569790

KEYWORDS: Fiber Bragg gratings, Calibration, Fiber optics sensors, Sensors, Biomedical optics, Fiber optics, Optical fibers, Temperature metrology, Fiber optics tests, Light sources

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SPIE Journal Paper | 1 October 2004

Novel configuration for lateral pressure tuning of a fiber Bragg grating without peak splitting

Jinu Paul, Liping Zhao, Bryan Ngoi, Zhong Ping Fang

OE, Vol. 43, Issue 10, (October 2004) https://doi.org/10.1117/12.10.1117/1.1783311

KEYWORDS: Fiber Bragg gratings, Polymers, Optical sensing, Optical communications, Coating, Birefringence, Mechanical engineering, Product engineering, Manufacturing, Packaging

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Proceedings Article | 10 September 2004 Paper

Simulation of the effect of adhesion and cross-sectional nonuniformity of coatings on the thermal tuning of fiber Bragg gratings

Jinu Paul, Liping Zhao, B.K.A. Ngoi, Zhong Ping Fang, Toh Yong, Zhaowei Zhong

Proceedings Volume 5465, (2004) https://doi.org/10.1117/12.545575

KEYWORDS: Fiber Bragg gratings, Optical coatings, Polymers, Optical fibers, Thermal effects, Finite element methods, 3D modeling, Silicon, Temperature metrology, Fiber coatings

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Proceedings Article | 8 March 2004 Paper

Improvement of thermal sensitivity of FBG sensors by combined cladding etching and polymer coating

Jinu Paul, Liping Zhao, Bryan Ngoi, Zhong Fang

Proceedings Volume 5272, (2004) https://doi.org/10.1117/12.516079

KEYWORDS: Fiber Bragg gratings, Polymers, Cladding, Coating, Etching, Sensors, Polymeric sensors, Temperature metrology, Optical sensing, Optical communications

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Proceedings Article | 17 June 2003 Paper

Theoretical investigation of the thermal stability of the center wavelength of a coated fiber Bragg grating

Liping Zhao, Jinu Paul, B. Ngoi, Fang Zhong Ping

Proceedings Volume 4989, (2003) https://doi.org/10.1117/12.474819

KEYWORDS: Fiber Bragg gratings, Coating, Thermal effects, Temperature metrology, Cladding, Fiber coatings, Polymers, Optical communications, Refractive index, Silica

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Proceedings Article | 24 October 2000 Paper

Eyepiece design with refractive-diffractive hybrid elements

Zhisheng Yun, Yee Loy Lam, Yan Zhou, XiaoCong Yuan, Liping Zhao, Jian Liu

Proceedings Volume 4093, (2000) https://doi.org/10.1117/12.405240

KEYWORDS: Monochromatic aberrations, Chromatic aberrations, Cements, Glasses, Lens design, Aberration correction, Eye, Visual optics, Visualization, Imaging systems

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Proceedings Article | 20 October 2000 Paper

Fabrication of diffractive micro-optical lens for integration with optoelectronic devices by direct laser writing

Chao Wang, Yuen Chuen Chan, Yee Loy Lam, Liping Zhao, Yan Zhou

Proceedings Volume 4226, (2000) https://doi.org/10.1117/12.404841

KEYWORDS: Lens design, Multiphoton lithography, Photoresist materials, Chemical elements, Bragg cells, Control systems, Ultraviolet radiation, Software, Optical components, Diffraction

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Proceedings Article | 12 November 1999 Paper

Preparation and properties of organically modified sol-gel silica/titania optical waveguides

Wenxiu Que, Yan Zhou, Yee Loy Lam, Shi De Cheng, Yuen Chuen Chan, Chan Hin Kam, Liping Zhao, Srinivasa Buddhudu

Proceedings Volume 3896, (1999) https://doi.org/10.1117/12.370382

KEYWORDS: Waveguides, Sol-gels, Titanium, Refractive index, Scanning electron microscopy, Atomic force microscopy, Wave propagation, Glasses, Thermal analysis, Silicon

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Proceedings Article | 11 November 1999 Paper

Achromatic design strategies with diffractive optical elements

Liping Zhao, Yee Loy Lam, Yan Zhou, Zhisheng Yun

Proceedings Volume 3897, (1999) https://doi.org/10.1117/12.369326

KEYWORDS: Diffractive optical elements, Diffraction, Optical components, Optical design, Dispersion, Chromatic aberrations, Binary data, Glasses, Monochromatic aberrations, Photonics

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Proceedings Article | 11 November 1999 Paper

Planar diffractive imaging element design

Zhisheng Yun, Yee Loy Lam, Yan Zhou, Liping Zhao

Proceedings Volume 3897, (1999) https://doi.org/10.1117/12.369361

KEYWORDS: Optical components, Imaging systems, Chemical elements, Optical design, Geometrical optics, Wavefronts, Microlens, Monochromatic aberrations, Lenses, Spherical lenses

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Proceedings Article | 17 September 1999 Paper

Design of planar-binary optical visor

Liping Zhao, Yee Loy Lam, Yan Zhou, Zhisheng Yun

Proceedings Volume 3778, (1999) https://doi.org/10.1117/12.363752

KEYWORDS: Binary data, Diffraction, Optical design, Optical components, Integrated optics, Chromatic aberrations, Reflection, Free space optics, Reflectivity, Diffractive optical elements

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Proceedings Article | 31 August 1999 Paper

Quasi-continuous mask-coding method for fabricating diffractive optical elements

Liping Zhao, Yee Loy Lam, Yan Zhou

Proceedings Volume 3879, (1999) https://doi.org/10.1117/12.360515

KEYWORDS: Diffraction, Photomasks, Binary data, Optical transfer functions, Image quality, Diffractive optical elements, Lithography, Laser applications, Imaging systems, Error analysis

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Proceedings Article | 31 August 1999 Paper

Planar optical system design and fabrication

Zhisheng Yun, Yee Loy Lam, Yuen Chuen Chan, Yan Zhou, Liping Zhao, ChinYi Liaw

Proceedings Volume 3879, (1999) https://doi.org/10.1117/12.360520

KEYWORDS: Optical design, Imaging systems, Diffraction gratings, Optical components, Optical imaging, Diffraction, Code v, Teeth, Fabrication, Photoresist materials

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Proceedings Article | 7 May 1999 Paper

Planar binary optical see-through visor design

Liping Zhao, Yee Loy Lam, Yan Zhou, Zhisheng Yun, Wenxiu Que

Proceedings Volume 3740, (1999) https://doi.org/10.1117/12.347803

KEYWORDS: Free space optics, Optical design, Binary data, Optical components, Glasses, Holography, Diffractive optical elements, Diffraction, Dispersion, Colorimetry

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Proceedings Article | 12 August 1998 Paper

Harmonic diffractive optical element and its application

Liping Zhao, Minxian Wu, Guofan Jin, Yingbai Yan

Proceedings Volume 3551, (1998) https://doi.org/10.1117/12.317988

KEYWORDS: Diffractive optical elements, Diffraction, Imaging systems, Optical scanning systems, Monochromatic aberrations, Optical design, Optical components, Fourier transforms, Image quality, Integrated optics

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Proceedings Article | 5 August 1998 Paper

Precise alignment of hybrid refractive-diffractive elements based on Fizeau interferometer

Liping Zhao, Minxian Wu, Guofan Jin, Ziying Zhao, Yingbai Yan

Proceedings Volume 3557, (1998) https://doi.org/10.1117/12.318292

KEYWORDS: Optical alignment, Diffractive optical elements, Optical components, Fizeau interferometers, Hybrid optics, Microscopes, Image quality, Telescopes, Objectives, Lenses

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Showing 5 of 29 publications

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