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Proceedings Paper

New Features Of The Ground Level Raindrop Size Distribution In The Lopm Size Range
Author(s): Eli Trakhovsky; Ami Ben-Shalom
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Paper 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.

Paper Details

Date Published: 10 November 1987
PDF: 7 pages
Proc. SPIE 0819, Infrared Technology XIII, (10 November 1987); doi: 10.1117/12.941816
Show Author Affiliations
Eli Trakhovsky, Electro-Optics Research Center (Israel)
Ami Ben-Shalom, Electro-Optics Research Center (Israel)

Published in SPIE Proceedings Vol. 0819:
Infrared Technology XIII
Irving J. Spiro, Editor(s)

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