Dr. Nandigana Krishna Mohan Profile

Dr. Nandigana Krishna Mohan

Senior Scientific Officer Gr.1 at Indian Institute of Technology Madras

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Author

Publications (33)

Proceedings Article | 17 July 2015 Paper

White light single-shot interferometry with colour CCD camera for optical inspection of microsystems

Paul Kumar Upputuri, Manojit Pramanik, Krishna Mohan Nandigana, Mahendra Prasad Kothiyal

Proceedings Volume 9524, 95240C (2015) https://doi.org/10.1117/12.2185802

KEYWORDS: Interferometry, CCD cameras, Phase shifts, Fringe analysis, Microsystems, Optical interferometry, Reflectivity, Profiling, Charge-coupled devices, Interferometers

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Proceedings Article | 4 March 2015 Paper

White light interferometer with color CCD for 3D-surface profiling of microsystems

Paul Upputuri, Manojit Pramanik, Krishna Nandigana, Mahendra Kothiyal

Proceedings Volume 9302, 93023R (2015) https://doi.org/10.1117/12.2081117

KEYWORDS: Profiling, Charge-coupled devices, Interferometers, Microsystems, Optical interferometry, CCD cameras, Phase shifts, Fringe analysis, 3D metrology, RGB color model

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Proceedings Article | 4 March 2015 Paper

Two-wavelength microscopic speckle interferometry using colour CCD camera

Paul Upputuri, Manojit Pramanik, Mahendra Kothiyal, Krishna Nandigana

Proceedings Volume 9302, 93023K (2015) https://doi.org/10.1117/12.2081122

KEYWORDS: Phase shifts, CCD cameras, Speckle interferometry, Nondestructive evaluation, Speckle, Charge-coupled devices, Speckle pattern, Data acquisition, Interferometry, Ferroelectric materials

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SPIE Journal Paper | 3 November 2014

Use of two wavelengths in microscopic TV holography for nondestructive testing

Paul Kumar Upputuri, Somasundaram Umapathy, Manojit Pramanik, Mahendra Prasad Kothiyal, Krishna Mohan Nandigana

OE, Vol. 53, Issue 11, 110501, (November 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.11.110501

KEYWORDS: Nondestructive evaluation, Microscopic TV holography, CCD cameras, Charge-coupled devices, Cameras, Holography, Data acquisition, Speckle, Phase measurement, Collimation

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Proceedings Article | 10 September 2009 Paper

Microscopic TV sherography for microsystems characterization

U. Kumar, N. Mohan, M. Kothiyal

Proceedings Volume 7432, 74320T (2009) https://doi.org/10.1117/12.825766

KEYWORDS: Digital signal processing, Speckle, Digital photography, Microsystems, Interferometers, Mirrors, Phase shifts, Digital filtering, Photography, Fringe analysis

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SPIE Journal Paper | 1 July 2009

Measurement of discontinuous surfaces using multiple-wavelength interferometry

Paul Kumar Upputuri, Nandigana Mohan, Mahendra Kothiyal

OE, Vol. 48, Issue 07, 073603, (July 2009) https://doi.org/10.1117/12.10.1117/1.3159867

KEYWORDS: Interferometry, Phase shifts, Phase interferometry, Silicon, Optical engineering, Charge-coupled devices, Phase measurement, Optical interferometry, Ferroelectric materials, Phase shifting

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SPIE Journal Paper | 1 February 2009

Deformation and shape measurement using multiple wavelength microscopic TV holography

U. Paul Kumar, Nandigana Krishna Mohan, Mahendra Kothiyal, Anand Asundi

OE, Vol. 48, Issue 02, 023601, (February 2009) https://doi.org/10.1117/12.10.1117/1.3083260

KEYWORDS: Microscopic TV holography, Holography, Line scan image sensors, Phase shifts, Shape analysis, Fringe analysis, Microelectromechanical systems, Ferroelectric materials, Speckle, Optical engineering

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Proceedings Article | 3 October 2008 Paper

Deformation analysis on micro objects using multiple wavelength microscopic TV holography

U. Paul Kumar, N. Krishna Mohan, M. Kothiyal, A. Asundi

Proceedings Volume 7155, 71550D (2008) https://doi.org/10.1117/12.814511

KEYWORDS: Phase shifts, Microscopic TV holography, Holography, Fringe analysis, Speckle, Ferroelectric materials, Microelectromechanical systems, Sensors, Imaging systems, Mirrors

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Proceedings Article | 11 August 2008 Paper

Multiple wavelength interferometry for surface profiling

U. Paul Kumar, N. Krishna Mohan, M. Kothiyal

Proceedings Volume 7063, 70630W (2008) https://doi.org/10.1117/12.793571

KEYWORDS: Interferometry, Phase shifts, Optical interferometry, Phase interferometry, Phase shifting, Silicon, Profiling, Ferroelectric materials, Bismuth, CCD cameras

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Proceedings Article | 14 September 2007 Paper

Non-destructive evaluation (NDE) using multi-aperture DSPI system and fast Fourier transform method

Basanta Bhaduri, N. Krishna Mohan, M. Kothiyal

Proceedings Volume 6671, 667115 (2007) https://doi.org/10.1117/12.732772

KEYWORDS: Fourier transforms, Nondestructive evaluation, Charge-coupled devices, Speckle, Mirrors, Speckle pattern, Phase shifting, Diffraction, Interferometry, Imaging systems

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SPIE Journal Paper | 1 May 2007

(1,N) spatial phase-shifting technique in digital speckle pattern interferometry and digital shearography for nondestructive evaluation

Basanta Bhaduri, Nandigana Krishna Mohan, Mahendra Kothiyal

OE, Vol. 46, Issue 05, 051009, (May 2007) https://doi.org/10.1117/12.10.1117/1.2740749

KEYWORDS: Nondestructive evaluation, Phase shifts, Speckle, Mirrors, Polymethylmethacrylate, Speckle pattern, Surface plasmons, Charge-coupled devices, Interferometry, Shearography

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SPIE Journal Paper | 1 October 2006

Cyclic-path digital speckle shear pattern interferometer: use of polarization phase-shifting method

Basanta Bhaduri, Nandigana Krishna Mohan, Mahendra Kothiyal

OE, Vol. 45, Issue 10, 105604, (October 2006) https://doi.org/10.1117/12.10.1117/1.2361194

KEYWORDS: Speckle, Interferometers, Polarization, Phase shifts, Speckle pattern, Fringe analysis, Optical engineering, Phase shifting, Polarizers, Mirrors

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Proceedings Article | 14 August 2006 Paper

Vibration mode shape visualization with dual function DSPI system

Basanta Bhaduri, M. Kothiyal, N. Krishna Mohan

Proceedings Volume 6292, 629217 (2006) https://doi.org/10.1117/12.680042

KEYWORDS: Shearography, Visualization, Mirrors, Fringe analysis, Phase shifts, Ferroelectric materials, Aluminum, Interferometry, Charge-coupled devices, Speckle pattern

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Proceedings Article | 7 March 2006 Paper

Fringe formation in a dual-beam symmetric illumination-observation TV holography system: an analysis

Nandigana Krishna Mohan, Angelica Andersson, Mikael Sjoedahl, Nils-Erik Molin

Proceedings Volume 4101, (2006) https://doi.org/10.1117/12.498450

KEYWORDS: Fringe analysis, Holography, Collimation, CCD cameras, Image processing, Speckle, Specular reflections, Phase shifts, 3D image processing, Interferometers

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Proceedings Article | 21 September 2005 Paper

A real time phase reversal read-out system with BaTiO3 crystal as a recording medium for speckle fringe analysis

Nandigana Krishna Mohan

Proceedings Volume 5912, 59120C (2005) https://doi.org/10.1117/12.614406

KEYWORDS: Speckle, Phase shifts, Crystals, Fringe analysis, Photography, Calibration, Speckle pattern, Laser crystals, Quartz, Phase shifting

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Proceedings Article | 30 July 2002 Paper

Optical image processing using phase reversal Twyman-Green interferometer

Vuyyuru Venkateswara Rao, Nandigana Krishna Mohan

Proceedings Volume 4736, (2002) https://doi.org/10.1117/12.477579

KEYWORDS: Interferometers, Phase shifts, Image processing, Transparency, Calibration, Quartz, Beam splitters, Phase interferometry, Mirrors, Interferometry

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SPIE Journal Paper | 1 December 2001

Dual-beam symmetric illumination-observation TV holography system for measurements

Nandigana Krishna Mohan, Angelica Svanbro, Mikael Sjodahl, Nils-Erik Molin

OE, Vol. 40, Issue 12, (December 2001) https://doi.org/10.1117/12.10.1117/1.1418010

KEYWORDS: Holography, CCD cameras, Interferometers, Sensors, Imaging systems, Illumination engineering, Image processing, Collimation, Specular reflections, Optical engineering

Proceedings Article | 4 October 2001 Paper

Development of a phase (contrast) reversal speckle interferometric system for in-plane displacement measurement with two-fold sensitivity

Nandigana Krishna Mohan

Proceedings Volume 4564, (2001) https://doi.org/10.1117/12.444108

KEYWORDS: Phase shifts, Speckle, Crystals, Photography, Laser crystals, Quartz, Calibration, Beam splitters, Interferometry, Ferroelectric materials

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SPIE Journal Paper | 1 February 2000

Parametric study of photorefractive beam coupling in BaTiO3 at multiple wavelengths

Mohammad Majles Ara, C. Vijayan, Nandigana Krishna Mohan, Rajpal Sirohi

OE, Vol. 39, Issue 02, (February 2000) https://doi.org/10.1117/12.10.1117/1.602392

KEYWORDS: Crystals, Laser crystals, Absorption, Spatial frequencies, Refractive index, Semiconductor lasers, Image processing, Crystallography, Electro optical modeling, Iron

SPIE Journal Paper | 1 November 1999

Measurement of in-plane displacement with twofold sensitivity using phase reversal technique

Nandigana Krishna Mohan

OE, Vol. 38, Issue 11, (November 1999) https://doi.org/10.1117/12.10.1117/1.602246

KEYWORDS: Wavefronts, Sensors, Wavefront sensors, Reconstruction algorithms, Image sensors, Phase retrieval, Phase shifts, System on a chip, Americium, Adaptive optics

Proceedings Article | 13 October 1999 Paper

Real-time image subtraction using phase reversal technique

Vuyyuru Venkateswara Rao, Nandigana Krishna Mohan

Proceedings Volume 3783, (1999) https://doi.org/10.1117/12.365748

KEYWORDS: Phase shifts, Interferometers, Mach-Zehnder interferometers, Calibration, Transparency, Interferometry, Image processing, Quartz, Data processing, Visualization

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Proceedings Article | 20 September 1999 Paper

Real-time speckle shear photography using BaTiO3 for in-plane strain and displacement measurements at multiple wavelengths

Mohammad Majles Ara, C. Vijayan, Nandigana Krishna Mohan, Rajpal Sirohi

Proceedings Volume 3801, (1999) https://doi.org/10.1117/12.363934

KEYWORDS: Crystals, Speckle, Photography, Laser crystals, Moire patterns, Ferroelectric materials, Speckle pattern, Fringe analysis, Image processing, Nd:YAG lasers

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Proceedings Article | 29 April 1999 Paper

Experimental characterization of photorefractive beam coupling in BaTiO3 crystal at multiple wavelengths

Mohammad Majles Ara, C. Vijayan, Nandigana Krishna Mohan, Mahendra Kothiyal, Rajpal Sirohi

Proceedings Volume 3729, (1999) https://doi.org/10.1117/12.346779

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Proceedings Article | 5 November 1998 Paper

Amplification of photon echo signals for photon-echo-based optical storage and optical processing devices

Mingzhen Tian, Nandigana Krishna Mohan, Ulf Elman, Baozhu Luo, Stefan Kroell

Proceedings Volume 3468, (1998) https://doi.org/10.1117/12.330413

KEYWORDS: Optical fibers, Signal processing, Fiber amplifiers, Crystals, Optical storage, ZBLAN, Photonic crystals, Luminescence, Optical signal processing, Signal generators

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SPIE Journal Paper | 1 November 1998

Phase step calibration and phase measurement in image plane holography using BaTiO3 crystal as a recording medium

S. Suja Helen, Mohammad Majles Ara, J. Darlin, Nandigana Krishna Mohan, Mahendra Kothiyal, Rajpal Sirohi

OE, Vol. 37, Issue 11, (November 1998) https://doi.org/10.1117/12.10.1117/1.601879

KEYWORDS: Crystals, Calibration, Fringe analysis, Phase measurement, Phase shifts, Laser crystals, Holography, Ferroelectric materials, Visualization, Diffraction gratings

Proceedings Article | 19 July 1996 Paper

Recent applications of TV holography and shearography

Nandigana Krishna Mohan, Henrik Saldner, Nils-Erik Molin

Proceedings Volume 2861, (1996) https://doi.org/10.1117/12.245173

KEYWORDS: Mirrors, Holography, Shearography, Interferometry, Sensors, Charge-coupled devices, Multiplexing, Video, CCD cameras, Modal analysis

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Proceedings Article | 19 July 1996 Paper

New simple ESPI configurations for deformation studies on large structures based on diffused reference beam

T. Santhanakrishnan, Nandigana Krishna Mohan, Rajpal Sirohi

Proceedings Volume 2861, (1996) https://doi.org/10.1117/12.245174

KEYWORDS: Diffusers, Speckle pattern, CCD cameras, Interferometers, Cameras, Mirrors, Video, Image processing, Interferometry, Holography

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Proceedings Article | 17 July 1996 Paper

Desensitized TV holography applied to static and vibrating objects for large deformation measurements

Henrik Saldner, Nils-Erik Molin, Nandigana Krishna Mohan

Proceedings Volume 2860, (1996) https://doi.org/10.1117/12.276325

KEYWORDS: Mirrors, Holography, Vibrometry, Modulation, Image processing, Phase shift keying, Beam splitters, Interferometry, Aluminum, Structural engineering

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SPIE Journal Paper | 1 February 1995

Comparative TV holography for vibration analysis

Henrik Saldner, Nandigana Krishna Mohan, Nils-Erik Molin

OE, Vol. 34, Issue 02, (February 1995) https://doi.org/10.1117/12.10.1117/12.188613

KEYWORDS: Mirrors, Interferometry, Image processing, Sensors, Holography, Vibrometry, Fringe analysis, Modulation, Data processing, Phase shifts

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Proceedings Article | 12 December 1994 Paper

Deformation studies with BaTiO3 Crystal as a recording medium

P. Sreedhar, Nandigana Krishna Mohan, Rajpal Sirohi

Proceedings Volume 2340, (1994) https://doi.org/10.1117/12.195939

KEYWORDS: Crystals, Ferroelectric materials, Fringe analysis, Laser crystals, Holography, Crystallography, Speckle, Photography, Interferometry, Collimation

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SPIE Journal Paper | 1 June 1994

Separation of the influence of in-plane displacement in multiaperture speckle shear interferometry

Nandigana Krishna Mohan, Prafulla Masalkar, Vadakke Murukeshan, Rajpal Sirohi

OE, Vol. 33, Issue 06, (June 1994) https://doi.org/10.1117/12.10.1117/12.167154

KEYWORDS: Speckle, Fringe analysis, Interferometry, Diffraction, Interferometers, Imaging systems, Photography, Moire patterns, Speckle pattern, Collimation

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SPIE Journal Paper | 1 June 1994

Real-time speckle photography with two-wave mixing in photorefractive BaTi03 crystals

P. Sreedhar, Nandigana Krishna Mohan, Rajpal Sirohi

OE, Vol. 33, Issue 06, (June 1994) https://doi.org/10.1117/12.10.1117/12.168865

KEYWORDS: Crystals, Speckle, Photography, Laser crystals, Ferroelectric materials, Fringe analysis, Phase shifts, Optical filters, Modulation, Sensors

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Proceedings Article | 28 May 1993 Paper

Electronic speckle pattern interferometry with holo-optical element

Nandigana Krishna Mohan, Prafulla Masalkar, Rajpal Sirohi

Proceedings Volume 1821, (1993) https://doi.org/10.1117/12.145541

KEYWORDS: Speckle pattern, Interferometry

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Showing 5 of 33 publications

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