&lt;title&gt;Probability density of intensity fluctuations for laser beams disturbed by turbulent aero-engine exhaust&lt;/title&gt;

Иванова, И. В.; Dmitriev, D. I.; Sirazetdinov, V. S.

doi:10.1117/12.725610

Cited by 3 publications

(3 citation statements)

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“…Because of a lot of modern applications of that problem in laser based-systems, many theoretical studies [1][2][3] and experimental investigations [4][5][6][7] of wave propagation through random media have been done in recent years.…”

Section: Introductionmentioning

confidence: 99%

Shape Optimization Using Genetic Algorithms and Laser Beam Propagation for the Determination of the Diffusion Coefficient in a Hot Turbulent Jet of Air

Nyobe¹,

Pemha²

2008

PIER B

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Abstract-The paper describes the propagation of a thin laser beam which passes through a hot turbulent jet, perpendicularly to the flow direction, using geometrical optics approximation. From the modelling of the random propagation direction of the laser beam along its whole path, the diffusion coefficient of the turbulent jet is determined by means of a shape optimization technique in which a genetic algorithm is used. The results obtained from the GA are then improved by the Golden Section method.

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Section: Introductionmentioning

confidence: 99%

Shape Optimization Using Genetic Algorithms and Laser Beam Propagation for the Determination of the Diffusion Coefficient in a Hot Turbulent Jet of Air

Nyobe¹,

Pemha²

2008

PIER B

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“…The first is to develop techniques for measuring the effects caused by the turbulent environment on the optical characteristics of the laser beam during its spread [19][20][21][22][23]. The second objective which is an inverse problem of the previous one, involves design techniques for extracting local or global information on turbulence from the Experimental set-up [26,29].…”

Section: Introductionmentioning

confidence: 99%

Genetic Algorithm Approach and Experimental Confirmation of a Laser-Based Diagnostic Technique for the Local Thermal Turbulence in a Hot Wind Tunnel Jet

Pemha¹,

Nyobe²

2011

PIER B

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Abstract-This paper is devoted to a laser-based diagnostic technique described as a method for solving an applied inverse problem in turbulent media using laser beam propagation. This problem consists of extracting local information about temperature fluctuations inside a hot turbulent jet of air, from the luminous photodiode trace produced by a laser beam, after having traversed the jet. A genetic algorithm is implemented in order to calculate the optimized laser beam directions corresponding to the whole luminous trace. An approximated ray equation which is proved from the geometrical optics is solved numerically by using those directions and enables to determine the variance of temperature fluctuations along the whole path of the laser beam. A good agreement coming from the comparison between the results obtained and the published experimental data proves the validity of the method.

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“…Many experimental investigations [29][30][31][32] have been carried out in order to enable a best understanding of the laser beam behaviour when it propagates through a heated turbulent medium. In this paper, we have focused our interest on the study of directional fluctuations of a thin laser beam.…”

Section: Introductionmentioning

confidence: 99%

Experimental Technique Using an Interference Pattern for Measuring Directional Fluctuations of a Laser Beam Created by a Strong Thermal Turbulence

Hona¹,

Nyobe²,

Pemha³

2008

PIER

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Abstract-In the view of measuring directional fluctuations of a thin laser beam sent through a heated turbulent jet, an optical method using interference and diffraction with the out coming beam is proposed. The experimental set-up is described. A new technique for separating directional fluctuations of the laser beam is explained. From the measurement of the interference pattern perturbations, are deduced the Rms of the laser beam deflection angle, the spectrum of directional fluctuations of the laser beam, and the value of a scattering coefficient characterizing the heated turbulent jet. The measured spectrum reveals a −8/3 power law and the value obtained for that coefficient is nearly equal to that found in previous works. This agreement enables to conclude that the experimental technique used is efficient and satisfactory.

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<title>Probability density of intensity fluctuations for laser beams disturbed by turbulent aero-engine exhaust</title>

Cited by 3 publications

References 0 publications

Shape Optimization Using Genetic Algorithms and Laser Beam Propagation for the Determination of the Diffusion Coefficient in a Hot Turbulent Jet of Air

Shape Optimization Using Genetic Algorithms and Laser Beam Propagation for the Determination of the Diffusion Coefficient in a Hot Turbulent Jet of Air

Genetic Algorithm Approach and Experimental Confirmation of a Laser-Based Diagnostic Technique for the Local Thermal Turbulence in a Hot Wind Tunnel Jet

Experimental Technique Using an Interference Pattern for Measuring Directional Fluctuations of a Laser Beam Created by a Strong Thermal Turbulence

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