Aureole radiance field about a source in a scattering–absorbing medium

Zachor, A. S.

doi:10.1364/ao.17.001911

Cited by 67 publications

(23 citation statements)

References 9 publications

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“…The wavelength dependent Rayleigh scattering cross-section, cYR(A), is calculated according to Bucholtz data : (1) where YR() is in cm2, A is in micrometers and A=3.01577.1028, B=3.55212, C=1.35579, D=O.1 1563.…”

Section: Extinction By Moleculesmentioning

confidence: 99%

Atmospheric propagation model for calculation of the aureole about a point source

Lavigne

Chervet

Langlois

et al. 2001

Atmospheric Propagation, Adaptive Systems, and Laser Radar Technology for Remote Sensing

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In the atmosphere, light scattering by molecules, particulates and aerosols causes an aureole around point-like sources. In various meteorological conditions, the radiance field coming from this aureole can be a non-negligible part of the total detected signal by large Field Of View sensors. In the framework of aureole's study, we have developed a method based on Monte Carlo calculation. The corresponding code permits to deal with monochromatic point sources in the 240 to 300 nm spectral range. The source's intensity angular dependency is axisymmetric and the atmosphere is described as a plane-parallel medium composed of a user defined constituents profiles. Systematic tests have been performed in order to evaluate the influence of the different input data on aureole results, such as ozone and 502 concentration values or ozone and aerosols concentration profiles. These computations will help us to define the set of meteorological parameters which need to be known accurately in order to compare computations with detected signals recorded during field experiments.

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Section: Extinction By Moleculesmentioning

confidence: 99%

Atmospheric propagation model for calculation of the aureole about a point source

Lavigne

Chervet

Langlois

et al. 2001

Atmospheric Propagation, Adaptive Systems, and Laser Radar Technology for Remote Sensing

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“…The molecular and aerosols scattering leads to a spreading of the plume image recorded by the UV sensor, and gives rise to a radiance field about the pointlike source. [1][2][3][4] This aureole's contribution is easily detected because of the low background and the high sensitivity of UV detectors. It is enhanced further when the source is partially shaded, as is usually the case when a sensor is detecting an incoming missile.…”

Section: Introductionmentioning

confidence: 99%

<title>UV missile-plume signature model</title>

Roblin

Baudoux

Chervet

2002

Targets and Backgrounds VIII: Characterization and Representation

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A new 3D radiative code is used to solve the radiative transfer equation in the UV spectral domain for a nonequilibrium and axisymmetric media such as a rocket plume composed of hot reactive gases and metallic oxide particles like alumina. Calculations take into account the dominant chemiluminescence radiation mechanism and multiple scattering effects produced by alumina particles. Plume radiative properties are studied by using a simple cylindrical media of finite length, deduced from different aerothermochemical real rocket plume afterburning zones. Assumed a log-normal size distribution of alumina particles, optical properties are calculated by using Mie theory. Due to large uncertainties of particles properties, systematic tests have been performed in order to evaluate the influence of the different input data (refractive index, particle mean geometric radius) upon the radiance field. These computations will help us to define the set of parameters which need to be known accurately in order to compare computations with radiance measurements obtained during field experiments.

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“…Ray s , k Mie s ) = (3 mrad, 30 • , 0.017, 0.72, 0.5, 0.972 km −1 , 0.266 km −1 , 0.284 km −1 ), where γ, f , and g are phase function parameters[20,21] and k a , k Ray s , and k UV NLOS link geometry. Comparison of experimentally measured and theoretically predicted path-loss estimates as a function of range for four pointing configurations.…”

mentioning

confidence: 99%

Experimental and simulated evaluation of long distance NLOS UV communication

Chen

Liao

et al. 2014

2014 9th International Symposium on Communication Systems, Networks &Amp; Digital Sign (CSNDSP)

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In this paper, experimental measurements of path loss and pulse broadening in long-distance non-line-of-sight (N-LOS) ultraviolet (UV) communications are reported and analyzed, with measurements at distances up to 4 km. The comparison of these results with a multiple-scattering channel model based on the Monte Carlo simulation of photon propagation provides strong evidence of the validity of this modeling approach. Additionally, channel models incorporating the effects of turbulence are also considered, but mismatch between experimental results and predictions of the turbulence models suggest the potential for model refinement. Overall, the experimental and simulation results presented here serve to advance the study of NLOS UV channel modeling, an essential component of communication system design.

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Aureole radiance field about a source in a scattering–absorbing medium

Cited by 67 publications

References 9 publications

Atmospheric propagation model for calculation of the aureole about a point source

Atmospheric propagation model for calculation of the aureole about a point source

<title>UV missile-plume signature model</title>

Experimental and simulated evaluation of long distance NLOS UV communication

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