New Features Of The Ground Level Raindrop Size Distribution In The Lopm Size Range

Eli Trakhovsky; Ami Ben-Shalom

doi:10.1117/12.941816

10 November 1987 New Features Of The Ground Level Raindrop Size Distribution In The 10μm Size Range

Eli Trakhovsky, Ami Ben-Shalom

Proceedings Volume 0819, Infrared Technology XIII; (1987) https://doi.org/10.1117/12.941816
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

The attenuation of IR radiation by the raindrop particles can be calculated if the rain drop size distribution is known. Number of models exists to predict raindrop size distribution, among them Marshall-Palmer and Joss-Waldrogel models. Recently, 2 independent field measurements during rain were performed in U.S., that showed the existence of the particles in the 10pm size range, which are not predicted by the existing models. First field measurement program involved direct measurements of the size distribution using Knollenberg PMS system and simultaneous measurements of IR and visible attenuation. Second field measurement program involved the measurements of the forward scattering of UV radiation by the particles using UV Forward Scatterometer. The results of 2 independent programs are presented and discussed. They indicate that the existing rain models will not predict correctly the attenuation in the thermal IR region.

Citation Download Citation

Eli Trakhovsky and Ami Ben-Shalom "New Features Of The Ground Level Raindrop Size Distribution In The 10μm Size Range", Proc. SPIE 0819, Infrared Technology XIII, (10 November 1987); https://doi.org/10.1117/12.941816

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KEYWORDS

Atmospheric modeling

Aerosols

Scattering

Electro optical modeling

Mass attenuation coefficient

Particles

Visible radiation

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