Prof. Fedor Vasilyevich Shugaev Profile

Prof. Fedor Vasilyevich Shugaev

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Publications (26)

Proceedings Article | 12 September 2021 Presentation + Paper

Distortions of the non-paraxial Gaussian beam propagating through inhomogeneous atmosphere

Fedor Shugaev, Oxana Nikolaeva, Evgeni Terentiev

Proceedings Volume 11860, 118600D (2021) https://doi.org/10.1117/12.2599752

KEYWORDS: Radio propagation, Beam propagation method, Wave propagation, Electromagnetism, Refractive index, Atmospheric physics

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Proceedings Article | 17 September 2020 Presentation + Paper

Propagation of Gaussian and Hermite-Gaussian non-paraxial beams in a homogeneous and inhomogeneous atmosphere

Fedor Shugaev, Oxana Nikolaeva, Natalia Suhareva

Proceedings Volume 11532, 115320A (2020) https://doi.org/10.1117/12.2573446

KEYWORDS: Atmospheric propagation, Radio propagation, Laser beam propagation, Earth's atmosphere, Wave propagation, Electromagnetism, Refractive index, Radio optics, Gaussian beams, Satellite communications

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Proceedings Article | 9 October 2019 Presentation + Paper

Properties of the electromagnetic field of a non-paraxial Gaussian beam propagating through homogeneous and inhomogeneous air

Fedor Shugaev, Oxana Nikolaeva, Natalia Suhareva

Proceedings Volume 11153, 111530E (2019) https://doi.org/10.1117/12.2533076

KEYWORDS: Radio propagation, Beam propagation method, Electromagnetism, Turbulence, Beam analyzers, Paraxial approximations, Refractive index

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Proceedings Article | 9 October 2018 Presentation + Paper

Propagation of the non-paraxial Gaussian beam through the inhomogeneous atmosphere

Fedor Shugaev, Oxana Nikolaeva, Natalia Suhareva

Proceedings Volume 10787, 107870P (2018) https://doi.org/10.1117/12.2325440

KEYWORDS: Refractive index, Turbulence, Beam analyzers, Atmospheric physics

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Proceedings Article | 29 September 2017 Paper

Modelling of propagation and scintillation of a laser beam through atmospheric turbulence

Fedor Shugaev, Ludmila Shtemenko, Olga Dokukina, Oxana Nikolaeva, Natalia Suhareva, Dmitri Cherkasov

Proceedings Volume 10425, 104250N (2017) https://doi.org/10.1117/12.2278085

KEYWORDS: Atmospheric propagation, Turbulence, Wave propagation, Modeling, Laser beam propagation, Scintillation, Atmospheric turbulence, Acoustics, Refractive index, Modulation

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The investigation was fulfilled on the basis of the Navier-Stokes equations for viscous heat-conducting gas. The Helmholtz decomposition of the velocity field into a potential part and a solenoidal one was used. We considered initial vorticity to be small. So the results refer only to weak turbulence. The solution has been represented in the form of power series over the initial vorticity, the coefficients being multiple integrals. In such a manner the system of the Navier- Stokes equations was reduced to a parabolic system with constant coefficients at high derivatives. The first terms of the series are the main ones that determine the properties of acoustic radiation at small vorticity. We modelled turbulence with the aid of an ensemble of vortical structures (vortical rings). Two problems have been considered : (i) density oscillations (and therefore the oscillations of the refractive index) in the case of a single vortex ring; (ii) oscillations in the case of an ensemble of vortex rings (ten in number). We considered vortex rings with helicity, too. The calculations were fulfilled for a wide range of vortex sizes (radii from 0.1 mm to several cm). As shown, density oscillations arise. High-frequency oscillations are modulated by a low-frequency signal. The value of the high frequency remains constant during the whole process excluding its final stage. The amplitude of the low-frequency oscillations grows with time as compared to the high-frequency ones. The low frequency lies within the spectrum of atmospheric turbulent fluctuations, if the radius of the vortex ring is equal to several cm. The value of the high frequency oscillations corresponds satisfactorily to experimental data. The results of the calculations may be used for the modelling of the Gaussian beam propagation through turbulence (including beam distortion, scintillation, beam wandering). A method is set forth which describes the propagation of non-paraxial beams. The method admits generalization to the case of inhomogeneous medium.

Proceedings Article | 21 October 2014 Paper

Modeling of laser beam propagation through turbulence

Fedor Shugaev, Ludmila Shtemenko, Oksana Nikolaeva, Tatiana Arsenyan, Natalia Suhareva, Anatoly Sukhorukov

Proceedings Volume 9242, 92421O (2014) https://doi.org/10.1117/12.2067188

KEYWORDS: Laser beam propagation, Turbulence, Gaussian beams, Atmospheric propagation, Radio propagation, Phase shift keying, Beam propagation method, Acoustics, Modulation, Wave propagation

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Proceedings Article | 17 October 2013 Paper

Density oscillations generated by vortex rings and their effect on scintillation of a Gaussian beam

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Oxana Nikolaeva

Proceedings Volume 8890, 88901A (2013) https://doi.org/10.1117/12.2029156

KEYWORDS: Atmospheric propagation, Scintillation, Gaussian beams, Super resolution, Turbulence, Data modeling, Atmospheric modeling, Beam propagation method, Laser beam propagation, Atmospheric optics

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Proceedings Article | 8 November 2012 Paper

Laser beam propagation through an ensemble of vortex rings in air

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Oksana Nikolaeva, Oxana Solenaya

Proceedings Volume 8535, 85350G (2012) https://doi.org/10.1117/12.974548

KEYWORDS: Laser beam propagation, Turbulence, Refractive index, Super resolution, Atmospheric propagation, Modulation transfer functions, Radio propagation, Atmospheric turbulence, Beam propagation method, Physics

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Proceedings Article | 11 October 2011 Paper

Statistical properties of density fluctuations in the atmosphere

Fedor Shugaev, Ludmila Shtemenko, Olga Dokukina, Oxana Nikolaeva, Tatiana Petrova, Oxana Solenaya

Proceedings Volume 8178, 81780C (2011) https://doi.org/10.1117/12.898108

KEYWORDS: Turbulence, Laser beam propagation, Atmospheric propagation, Photodiodes, Statistical analysis, Signal processing, Fourier transforms, Distortion, Schlieren techniques, Calibration

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Proceedings Article | 12 October 2010 Paper

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Olga Dokukina, Tatiana Petrova

Proceedings Volume 7828, 78280F (2010) https://doi.org/10.1117/12.864990

KEYWORDS: Atmospheric propagation, Turbulence, Laser beam propagation, Atmospheric optics, Heat flux, Thermal effects, Beam propagation method, Atmospheric plasma, Modulation transfer functions, Atmospheric turbulence

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Proceedings Article | 1 October 2009 Paper

Characterization of a laser beam propagating through the turbulent atmosphere

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Olga Dokukina, Tatiana Petrova

Proceedings Volume 7476, 74760C (2009) https://doi.org/10.1117/12.830161

KEYWORDS: Atmospheric propagation, Turbulence, Laser beam propagation, Atmospheric modeling, Modulation transfer functions, Numerical analysis, Fourier transforms, High power lasers, Atmospheric optics, Refractive index

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Proceedings Article | 9 October 2008 Paper

The effect of the strong turbulence regime on the laser beam propagation and focusing

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Olga Dokukina, Tatiana Petrova

Proceedings Volume 7108, 71080A (2008) https://doi.org/10.1117/12.800171

KEYWORDS: Turbulence, Atmospheric propagation, Laser beam propagation, Fourier transforms, Statistical analysis, Atmospheric optics, Refractive index, Plasma, High power lasers, 3D acquisition

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Proceedings Article | 29 October 2007 Paper

On the problem of beam focusing in the turbulent atmosphere

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Oksana Nikolaeva, Tatiana Pavlova, Olga Dokukina

Proceedings Volume 6747, 67470K (2007) https://doi.org/10.1117/12.737757

KEYWORDS: Turbulence, Mirrors, Atmospheric propagation, Refractive index, Data modeling, Wave propagation, Laser beam propagation, Beam propagation method, Atmospheric physics, Physics

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Proceedings Article | 28 September 2006 Paper

Characterization of compensation for nonuniform image distortions due to atmospheric turbulence

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Oksana Ignateva

Proceedings Volume 6364, 63640H (2006) https://doi.org/10.1117/12.688924

KEYWORDS: Atmospheric propagation, Laser beam propagation, Atmospheric turbulence, Laser therapeutics, Deformable mirrors, Atmospheric optics, Turbulence, Gaussian beams, Mathematical modeling, Optical telescopes

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Proceedings Article | 17 May 2006 Paper

Modelling of laser beam propagation through the whirlwind

Evgeni Terentiev, Fedor Shugaev, Ludmila Shtemenko, Olga Dokukina, Oksana Ignateva

Proceedings Volume 6215, 62150C (2006) https://doi.org/10.1117/12.665751

KEYWORDS: Laser beam propagation, Atmospheric propagation, Atmospheric modeling, Complex systems, 3D modeling, Gaussian beams, Modeling, Wave propagation, Atmospheric physics, Optical telescopes

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Proceedings Article | 14 October 2005 Paper

Characterization of a laser beam in turbulent atmosphere

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Olga Dokukina, Oksana Ignateva

Proceedings Volume 5981, 59810F (2005) https://doi.org/10.1117/12.627516

KEYWORDS: Atmospheric propagation, Laser beam propagation, Gaussian beams, 3D modeling, Turbulence, Complex systems, Atmospheric physics, Refractive index, Finite difference methods, Correlation function

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Proceedings Article | 25 May 2005 Paper

Modeling of laser beam propagation through turbulent medium

Evgeni Terentiev, Fedor Shugaev, Ludmila Shtemenko, Olga Dokukina, Oksana Ignateva

Proceedings Volume 5793, (2005) https://doi.org/10.1117/12.603598

KEYWORDS: Laser beam propagation, Atmospheric propagation, Refractive index, 3D modeling, Gaussian beams, Fourier transforms, Point spread functions, Turbulence, Image acquisition, Modulation transfer functions

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Proceedings Article | 11 November 2004 Paper

Influence of turbulent fluctuations on imaging quality and compensation for distortions

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Olga Dokukina, Oksana Ignateva

Proceedings Volume 5572, (2004) https://doi.org/10.1117/12.565482

KEYWORDS: Point spread functions, Atmospheric propagation, Correlation function, 3D modeling, Fourier transforms, Modulation transfer functions, Refractive index, Turbulence, Molybdenum, Image acquisition

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Proceedings Article | 10 November 2004 Paper

Ultraresolution of microwave, color, and synthetic color images

Evgeni Terentiev, Nikolai Terentiev, Fedor Shugaev

Proceedings Volume 5573, (2004) https://doi.org/10.1117/12.565619

KEYWORDS: Point spread functions, Modulation transfer functions, Molybdenum, Microwave radiation, Convolution, Digital imaging, Image sensors, Sensors, Visual process modeling, Antennas

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Proceedings Article | 22 October 2004 Paper

Inside the ultra-resolution method

Evgeni Terentiev, Nikolai Terentiev, Fedor Shugaev

Proceedings Volume 5574, (2004) https://doi.org/10.1117/12.565610

KEYWORDS: Point spread functions, Modulation transfer functions, Super resolution, Sun, Microwave radiation, Image resolution, RGB color model, Convolution, Physics, Visual process modeling

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Proceedings Article | 6 February 2004 Paper

Local-linear method of super-resolution for compensation of image distortions using a new model of turbulence

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Olga Dokukina, Oksana Ignateva

Proceedings Volume 5237, (2004) https://doi.org/10.1117/12.511108

KEYWORDS: Point spread functions, Turbulence, Super resolution, Correlation function, Refractive index, Modulation transfer functions, Atmospheric propagation, Atmospheric modeling, Data modeling, Image acquisition

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Proceedings Article | 21 August 2003 Paper

Models of atmospheric turbulent distortions for images and super-resolution

Fedor Shugaev, Evgeni Terentiev, Ludmila Shtemenko, Elena Bratinkova

Proceedings Volume 5087, (2003) https://doi.org/10.1117/12.487747

KEYWORDS: Point spread functions, Turbulence, Atmospheric modeling, Super resolution, Correlation function, Modulation transfer functions, Refractive index, Sensors, Convolution, Imaging systems

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As known, the problem of compensation of turbulent distortions is an ill-posed one. Regularization methods are found to be inefficient. The problem can be solved by using local-linear super-resolution method. Its main feature consists in diminishing of problem dimensions. We use the terminology of multi sensors (rays) systems for this purpose and a new concept of resolving function R. Each linear device which forms image is characterized by two functions: PSF O and MTF M on observation area D. The function R resolves a function O, if their cyclical product (or convolution) is equal (or near) to d - delta function: R*O = O*R = d on D. The resolving image R*I on D can be presented as measured one by fine “registering system” with narrower PSF R*O that cannot be achieved physically. If area D is as small as one of O, then the corresponding values of M are relatively large ones and there is no problem for compensation of distortions. The special arrangement of local subareas of D is obtained by solving the next multi sensors (rays) problem: to separate the image I and the distorting PSF O on the observation area D so that at small quantity of data the resolution problem with R could be solved strictly and with the minimum border effect. Grid-generated turbulence in a shock tube was chosen as an example of homogeneous and isotropic turbulence. Statistical properties of this flow have been investigated experimentally. We found the correlation function and structure function for the fluctuations of refractive index. In our case of grid-generated turbulence the statistical properties are distinct from the Kolmogorov's two-thirds law. We modeled laser beam propagation through turbulent atmosphere and obtained the numerical results for the distortions of images. The distortion O (r) of PSF and the set of resolving functions R were found according to the structure function. The problem of compensation of distortions caused by turbulence was solved with the aid of a new local-linear super-resolution method. This method allows to resolve turbulent distortions of PSF at low signal-to-noise ratio.

Proceedings Article | 20 March 2003 Paper

Influence of turbulent fluctuations of refractive index on PSF

Fedor Shugaev, Evgeni Terentiev, Ludmilla Shtemenko, Elena Bratinkova

Proceedings Volume 4884, (2003) https://doi.org/10.1117/12.462509

KEYWORDS: Point spread functions, Refractive index, Turbulence, Correlation function, Modulation transfer functions, Radio propagation, Wave propagation, Optical filters, Digital filtering, Electronic filtering

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Proceedings Article | 13 March 2003 Paper

Superresolution in a multiray vision system with relative correction of rays

Evgeni Terentiev, Nikolai Terentiev, Fedor Shugaev

Proceedings Volume 4885, (2003) https://doi.org/10.1117/12.463244

KEYWORDS: Super resolution, Point spread functions, Sensors, Modulation transfer functions, Physics, Antennas, Dysprosium, Mathematical modeling, Imaging systems, Extremely high frequency

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Proceedings Article | 28 January 2002 Paper

Forms of images and indication of targets

Evgeni Terentiev, Nikolai Terentiev, Fedor Shugaev

Proceedings Volume 4541, (2002) https://doi.org/10.1117/12.454176

KEYWORDS: Point spread functions, Super resolution, Modulation transfer functions, Antennas, Imaging systems, Vector spaces, Convolution, Image resolution, Space operations, Aluminum

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Proceedings Article | 28 January 2002 Paper

Applications of the local-linear method of super-resolution

Evgeni Terentiev, Nikolai Terentiev, Fedor Shugaev

Proceedings Volume 4541, (2002) https://doi.org/10.1117/12.454177

KEYWORDS: Point spread functions, Super resolution, Modulation transfer functions, Sun, Stars, Antennas, Digital imaging, Imaging systems, Aluminum, Astronomy

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Showing 5 of 26 publications

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