Title page for ETD etd-936202349751421

Type of Document

Master's Thesis

Author

Kontogeorgakis, Christos

URN

etd-936202349751421

Title

millimeter Through Visible Frequency Waves Through Aerosols-Particle Modeling, Reflectivity and Attenuation

Degree

Master of Science

Department

Electrical and Computer Engineering

Advisory Committee

Advisor Name	Title
Besieris, Ioannis M.
Bostian, Charles W.
de Wolf, David A.	Committee Chair

Keywords

none

Date of Defense

1997-05-09

Availability

unrestricted

Abstract

This thesis addresses the problem of modeling

atmospheric aerosol (such as haze and fog)

particle-size distributions in order to predict the

effects (such as attenuation and reflectivity) that

these particles have upon the propagation of

electromagnetic waves of micrometer range

wavelengths. Specifically, an inversely

proportional to the fourth power of the particle

diameter model is used for haze and the gamma

and lognormal distribution models are used for

fog. In the case of fog the models are developed

based on data consisting of measured fog

particle-size distributions at five locations. In this

relatively big amount of data, the gamma

distribution model is an accurate fit for all the

cases and, also, the resulted size distribution does

not depend on the altitude. This leads to

considerably simpler formulations which yield a

linear relationship between the reflectivity factor

and the liquid water content. The knowledge of

one parameter appears to be enough for defining

the model and subsequently predicting reflectivity

and attenuation. Attenuation and reflection in haze

are found to be insignificant for millimeter

wavelengths and somewhat appreciable for the

visible ones. In fog, attenuation is found to be

extremely high for the infrared-to-visible

wavelengths and very low for the millimeter ones.

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