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Optical Engineering

Estimation of cloud droplet size density distribution from multiple-field-of-view lidar returns
Author(s): Gilles Roy; Luc R. Bissonnette; Christian Bastille; Gilles Vallee
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Paper Abstract

A simple model based on diffraction and geometrical optics relates the field-of-view dependent lidar signal returns from clouds to the size density distribution of their water droplets. The relation is written in a matrix form. The apparent size density distribution is obtained via matrix inversion with a constraint technique. The perturbation caused by the geometrical optics is interpreted in terms of small-particle diffraction. The apparent size density distribution is corrected for multiple scattering a posteriori. The correction is established by calculating the relative contribution of the different scattering orders to the broadening of the scattering phase function. The validity of the model is supported by Monte Carlo simulations and by experimental data performed under controlled conditions. Finally the inversion technique is applied to multiple-field-ofview (MFOV) lidar measurements from real clouds.

Paper Details

Date Published: 1 December 1997
PDF: 12 pages
Opt. Eng. 36(12) doi: 10.1117/1.601594
Published in: Optical Engineering Volume 36, Issue 12
Show Author Affiliations
Gilles Roy, Defence Research Establishment Valcartier (Canada)
Luc R. Bissonnette, Defence Research Establishment Valcartier (Canada)
Christian Bastille, Defense Research Establishment Valcartier (Canada)
Gilles Vallee, Defense Research Establishment Valcartier (Canada)


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