Dr. Varun Kumar Profile

Dr. Varun Kumar

at Shimane Univ

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Author

Publications (14)

Proceedings Article | 8 December 2022 Paper

Volume phase holographic grating based digital holographic interferometer for temperature measurement of human hand skin

Vivek Rastogi, Varun Kumar, Satish Kumar Dubey, Gufran Sayeed Khan, Chandra Shakher

Proceedings Volume 12480, 1248006 (2022) https://doi.org/10.1117/12.2660156

KEYWORDS: Skin, Temperature metrology, Digital holography, Holography, Sensors, Holographic interferometry, Volume holography, Refractive index, Infrared radiation, Holographic interferometers

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Proceedings Article | 20 June 2021 Presentation + Paper

Volume phase holographic grating based digital holographic interferometer for measurement of temperature distribution and temperature fluctuations in diffusion flames

Vivek Rastogi, Varun Kumar, Satish Dubey, Gufran Khan, Chandra Shakher

Proceedings Volume 11782, 117820K (2021) https://doi.org/10.1117/12.2592405

KEYWORDS: Temperature metrology, Digital holography, Holographic interferometry, Diffusion, Holography, Volume holography, Signal to noise ratio, Interferometry, Holographic interferometers, Speckle

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SPIE Journal Paper | 10 June 2020

Investigation of temperature profile and temperature stability of micro diffusion flame under the influence of magnetic field by use of a holo-shear lens-based interferometer

Varun Kumar, Vivek Rastogi, Shilpi Agarwal, Chandra Shakher

OE, Vol. 59, Issue 06, 064107, (June 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.6.064107

KEYWORDS: Magnetism, Diffusion, Temperature metrology, Interferometers, Combustion, Refractive index, Optical engineering, Fringe analysis, Wavefronts, Photography

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Proceedings Article | 18 November 2019 Paper

Holo-shear lens based interferometer for measurement of temperature distribution and fluctuation of temperature in micro flame

Varun Kumar, Vivek Rastogi, Shilpi Agarwal, Chandra Shakher

Proceedings Volume 11188, 111881F (2019) https://doi.org/10.1117/12.2537321

KEYWORDS: Temperature metrology, Interferometers, Spherical lenses, Refractive index, Combustion, Holograms, Wavefronts, Fringe analysis

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Proceedings Article | 18 November 2019 Paper

Visual and quantitative investigation on heat flow performance from heat sinks using digital holographic interferometer

Varun Kumar, Chandra Shakher

Proceedings Volume 11188, 111881C (2019) https://doi.org/10.1117/12.2537516

KEYWORDS: Digital holography, Visualization, Holographic interferometry, Thermal effects, Avionic systems, Electronic components, Microelectromechanical systems, Holograms, Convection, Cooling systems

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Proceedings Article | 23 April 2019 Presentation + Paper

Measurement of temperature and temperature fluctuations in wick stabilized micro flame using digital holographic interferometry

Shilpi Agarwal, Vivek Rastogi, Varun Kumar, Satish Dubey, Chandra Shakher

Proceedings Volume 11030, 1103012 (2019) https://doi.org/10.1117/12.2520885

KEYWORDS: Temperature metrology, Digital holography, Diffusion, Holograms, Refractive index, Combustion, Holographic interferometry, Sensors, Spherical lenses, Convection

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SPIE Journal Paper | 13 October 2017 Open Access

Analysis of red blood cell parameters by Talbot-projected fringes

Shilpi Agarwal, Varun Kumar, Chandra Shakher

JBO, Vol. 22, Issue 10, 106009, (October 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.10.106009

KEYWORDS: Blood, Refractive index, 3D image processing, Phase measurement, Microscopy, CCD cameras, Microscopes, Imaging systems, Image resolution, Fringe analysis

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Proceedings Article | 22 August 2017 Paper

Onion cell imaging by using Talbot/self-imaging effect

Shilpi Agarwal, Varun Kumar, Chandra Shakher

Proceedings Volume 10453, 104532X (2017) https://doi.org/10.1117/12.2276348

KEYWORDS: Diffraction gratings, 3D image processing, Fourier transforms, Optical microscopy, Microscopy, Interferometry, Medical research, Live cell imaging, Phase contrast, Ultraviolet radiation

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Proceedings Article | 22 August 2017 Paper

Phase contrast imaging of red blood cells using digital holographic interferometric microscope

Varun Kumar, Gufran Khan, Chandra Shakher

Proceedings Volume 10453, 104532T (2017) https://doi.org/10.1117/12.2276335

KEYWORDS: Digital holography, Holographic interferometry, Phase contrast, Microscopes, Blood, Phase shifting, Phase compensation, 3D image reconstruction, Holograms, Interferometry

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SPIE Journal Paper | 24 January 2017

Measurement of temperature and temperature profile of wick stabilized micro diffusion flame under the effect of magnetic field using digital speckle pattern interferometry

Pranav Kumar Pandey, Manoj Kumar, Varun Kumar, Chandra Shakher

OE, Vol. 56, Issue 01, 014106, (January 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.1.014106

KEYWORDS: Magnetism, Temperature metrology, Fringe analysis, Diffusion, Refractive index, Interferometry, Digital filtering, Combustion, Speckle pattern, Speckle

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Proceedings Article | 24 August 2015 Paper

Analysis of alcohol-water diffusion process using digital holographic interferometry

Shilpi Agarwal, Manoj Kumar, Varun Kumar, Chandra Shakher

Proceedings Volume 9660, 96600S (2015) https://doi.org/10.1117/12.2196422

KEYWORDS: Diffusion, Digital holography, Holograms, Fourier transforms, Holographic interferometry, 3D image reconstruction, Refractive index, Beam splitters, Spherical lenses, Diffusers

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Proceedings Article | 24 August 2015 Paper

Temperature measurement of axi- symmetric butane diffusion flame under the influence of upward decreasing gradient magnetic field using digital holographic interferometry

Varun Kumar, Manoj Kumar, Chandra Shakher

Proceedings Volume 9660, 96600I (2015) https://doi.org/10.1117/12.2196396

KEYWORDS: Magnetism, Digital holography, Holograms, Temperature metrology, Refractive index, Diffusion, Holographic interferometry, Oxygen, Digital recording, Combustion

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SPIE Journal Paper | 7 August 2015

Measurement of temperature and temperature profile of candle flame using holo-shear lens and Fourier fringe analysis technique

Varun Kumar, Chandra Shakher

OE, Vol. 54, Issue 08, 084105, (August 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.8.084105

KEYWORDS: Temperature metrology, Fringe analysis, Refractive index, Interferometry, Interferometers, Wavefronts, Fourier transforms, Speckle, Phase measurement, Holography

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Proceedings Article | 17 December 2013 Paper

Measurement of temperature and temperature distribution in diffusion flames using digital speckle pattern interferometry

Manoj Kumar, Varun Kumar, Chandra Shakher

Proceedings Volume 9066, 90660Y (2013) https://doi.org/10.1117/12.2047634

KEYWORDS: Temperature metrology, Speckle, Diffusion, Refractive index, Speckle pattern, Fringe analysis, Interferometry, Combustion, CMOS sensors, Beam splitters

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Showing 5 of 14 publications

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