Atmospheric IR propagation

Physics

Scientific paper

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Aerosols, Atmospheric Scattering, Computerized Simulation, Infrared Radiation, Turbulence Effects, Atmospheric Attenuation, Molecular Absorption, Particle Size Distribution, Phase Shift, Raindrops

Scientific paper

The state-of-the-art of IR atmospheric propagation modelling is reviewed, based mainly on experimental work performed at the FfO. The main improvements of transmission models rely on the results of measurements, analysis and modelling of aerosol and other atmospheric particle size distributions (0.15 micron to 12 mm diameter) over land and sea, performed in the context of long-range transmission experiments and lidar probings. Remaining problem areas are identified and discussed, e.g. continuum absorption and fog window. The modelling of turbulence-induced fluctuations of amplitude and phase is of increasing interest as related to IR atmospheric windows and relevant laser lines. Recent experimental results on phase fluctuations are discussed, especially in relation to attempts to derive a better modelling of atmospheric microturbulence.

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