Dr. Gregory Toker Profile

Dr. Gregory Toker

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Publications (13)

Proceedings Article | 11 August 2008 Paper

Micro Fabry-Perot sensor for surface measurement

Andrei Brunfeld, Gregory Toker, Morey Roscrow, Bryan Clark

Proceedings Volume 7063, 70630U (2008) https://doi.org/10.1117/12.798135

KEYWORDS: Inspection, Interferometry, Scattering, Surface finishing, Fabry–Perot interferometers, Resonators, Interferometers, Head, Mirrors, Laser scattering

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Proceedings Article | 30 May 2003 Paper

Vector simulations of dark beam interaction with nanoscale surface features

Alexander Tavrov, Norbert Kerwien, Reinhard Berger, Hans Tiziani, Michael Totzeck, Boris Spektor, Josef Shamir, Gregory Toker, Andrei Brunfeld

Proceedings Volume 5144, (2003) https://doi.org/10.1117/12.500588

KEYWORDS: Polarization, Microscopes, Signal detection, Microscopy, Photodetectors, Interference (communication), Diffraction, Signal to noise ratio, Objectives, Inspection

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Proceedings Article | 20 June 2002 Paper

High-resolution surface feature evaluation using multiwavelength optical transforms

Boris Spektor, Gregory Toker, Joseph Shamir, Michael Friedman, Andrei Brunfeld

Proceedings Volume 4777, (2002) https://doi.org/10.1117/12.472234

KEYWORDS: Signal detection, Transform theory, Sensors, Diffraction, Optical testing, Reconstruction algorithms, Near field optics, Interferometry, Reflectivity, Gaussian beams

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Proceedings Article | 20 June 2002 Paper

In-line optical surface roughness determination by laser scanning

Gregory Toker, Andrei Brunfeld, Joseph Shamir, Boris Spektor, Evan Cromwell, Johann Adam

Proceedings Volume 4777, (2002) https://doi.org/10.1117/12.472232

KEYWORDS: Surface roughness, Atomic force microscopy, Sensors, Wavefronts, Inspection, Fourier transforms, Laser scanners, Surface finishing, Optical testing, Statistical analysis

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Proceedings Article | 20 October 1998 Paper

Direct measurements of aero-optical effects in the Technion Supersonic Wind Tunnel

Alexander Lessin, Daniel Levin, Viktoria Suponitsky, Gregory Toker

Proceedings Volume 3432, (1998) https://doi.org/10.1117/12.327970

KEYWORDS: Optical testing, Distortion, Holograms, Interferometry, Visualization, 3D modeling, Holography, Holographic interferometry, Calibration, Light sources

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Proceedings Article | 6 July 1998 Paper

Dual-hologram shearing interferometry with regulated sensitivity

Gregory Toker, Daniel Levin

Proceedings Volume 3479, (1998) https://doi.org/10.1117/12.316453

KEYWORDS: Holograms, Interferometry, Holographic interferometry, Holography, Nose, Wavefronts, Phase measurement, Visualization, Spatial frequencies, Diagnostics

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Proceedings Article | 30 June 1998 Paper

Dual-hologram shearing interference technique with regulated sensitivity

Gregory Toker, Daniel Levin

Proceedings Volume 3478, (1998) https://doi.org/10.1117/12.312940

KEYWORDS: Holograms, Interferometry, Holographic interferometry, Holography, Phase measurement, Wavefronts, Nose, Visualization, Spatial frequencies, Diagnostics

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Proceedings Article | 30 June 1998 Paper

New ellipsometric configuration based on a Zeeman laser for fast measurements

Liviu Singher, Leonid Boim, Gregory Toker

Proceedings Volume 3478, (1998) https://doi.org/10.1117/12.312971

KEYWORDS: Prisms, Sensors, Signal detection, Polarization, Polarizers, Silicon, Reflection, Nondestructive evaluation, Thin films, Polarimetry

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Proceedings Article | 22 September 1997 Paper

Comprehensive optical diagnostics of complex flow fields

Gregory Toker, Daniel Levin, Alexander Lessin

Proceedings Volume 3110, (1997) https://doi.org/10.1117/12.281400

KEYWORDS: Holograms, Holographic interferometry, Holography, Light sources, Interferometers, Moire patterns, Interferometry, Optical diagnostics, Laser optics, Deflectometry

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This paper describes a series of promising optical diagnostic techniques to provide a comprehensive acquisition of the optical information from various flow fields under investigation. A simultaneous application of the two or even several diagnostic techniques which combines a CFD code calculations yield more accurate measurements of the density and/or the density gradient distributions in complex flow fields. Traditionally qualitative data of the density gradient in a high speed compressible flow have been obtained by schlierengraphy. A white light source and a laser two optical arms schlieren optical schemes were constructed on the base of a conventional schlieren system. The optical image of a model was focused on a photo film and projected on a screen. A CCD- camera was used to catch the focused image in real time, to display it on a control monitor and to record it on a video tape recorder. An acoustically stable holographic variable shear interferometer, which has been easily constructed on the base of the conventional schlieren system allowed to record a signal hologram during the wind tunnel run by using a continuous wave laser light source. Signal and comparison holograms have then been post-processed by the dual hologram technique to display shearing interferograms. A holographic Moire deflectometry method is presented. The holographic recording provides a 'freezing' of the distorted signal wave on a hologram to analyze it a posteriori by the Moire technique. A novel holographic Moire interferometer is described and its application to testing a small size axisymmetric supersonic air jet is shown. An interference method with enhanced sensitivity and compensating for optical aberrations, which is based on rerecording holograms is briefly described. It would provide a reliable acquisition of the phase information from wide range of weak phase objects including high speed low density flow fields. The method has been demonstrated by mapping the density field of the supersonic air jet as a representative weak phase object. The numerical analysis of a 2-D flow field was also carried out by means of computational fluid dynamics (CFD) methods.

Proceedings Article | 11 March 1996 Paper

Defect analysis with black beam interferometry

Gregory Toker, Andrei Brunfeld

Proceedings Volume 2651, (1996) https://doi.org/10.1117/12.235346

KEYWORDS: Sensors, Signal detection, Interferometry, Inspection, Glasses, Calibration, Beam analyzers, Defect detection, Interferometers, LCDs

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Proceedings Article | 4 November 1994 Paper

Polarization effects in optical thin films

Kopel Rabinovitch, Gregory Toker

Proceedings Volume 2253, (1994) https://doi.org/10.1117/12.192057

KEYWORDS: Polarization, Phase shifts, Thin films, Dielectric polarization, Prisms, Reflection, Reflectivity, Thin film coatings, Optical components, Retroreflectors

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Proceedings Article | 7 September 1994 Paper

Genetic algorithm and thin-film design

Kopel Rabinovitch, Gregory Toker

Proceedings Volume 2262, (1994) https://doi.org/10.1117/12.185793

KEYWORDS: Polarization, Thin films, Genetic algorithms, Phase shifts, Prisms, Coating, Reflection, Reflectivity, Optimization (mathematics), Dielectric polarization

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Proceedings Article | 1 July 1991 Paper

Study of active 3-D terrain mapping for helicopter landings

Mordekhai Velger, Gregory Toker

Proceedings Volume 1478, (1991) https://doi.org/10.1117/12.45633

KEYWORDS: Sensors, Navigation systems, Filtering (signal processing), Imaging systems, 3D metrology, 3D displays, 3D image processing, Visibility, Electronic filtering, 3D vision

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Showing 5 of 13 publications

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