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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