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MEASURING OPTICAL TURBULENCE PARAMETERS WITH A THREE-APERTURE RECEIVER
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TitleMEASURING OPTICAL TURBULENCE PARAMETERS WITH A THREE-APERTURE RECEIVER
AuthorWayne, David
KeywordsAtmosphere
optical turbulence
scintillometer
Cn2
inner scale
outer scale
crosswind
three-aperture
experiment
AbstractThis thesis discusses methods to measure several atmospheric parameters related to turbulence. Techniques used by two different scintillometers based on weak turbulence theory are discussed along with a method to estimate the inner scale developed by Hill. The theory and minimization algorithm used to infer the atmospheric parameters are discussed. The main focus is on the analysis and collection of experimental data with a three-aperture receiver system. Intensity fluctuations from a CW laser source are collected over a 1km path with three different receiving apertures. The scintillation index is found for each receiving aperture and recently developed theory for all regimes of optical turbulence is used to infer three atmospheric parameters, Cn2, l0, and L0. The transverse wind speed is also calculated from the experimental data using a cross-correlation technique. Parallel to the three-aperture data collection is a commercial scintillometer unit which reports Cn2 and crosswind speed. There is also a weather station positioned at the receiver side which provides point measurements for temperature and wind speed. The Cn2 measurement obtained from the commercial scintillometer is used to infer l0, L0, and the scintillation index. Those values are then compared to the inferred atmospheric parameters from the experimental data. Hill's method is used as an estimate to l0 based upon path-averaged wind speed and is compared to the inferred l0 values. The optimal aperture sizes required for three-aperture data collection are presented. In closing, the technique for measuring crosswind speed is discussed along with the ideal aperture size and separation distance for data collection. Suggestions are offered for future experimentation.
AdviserPhillips, Ronald
PublisherUniversity of Central Florida
DegreeM.S.E.E.
Degree DisciplineSchool of Electrical Engineering and Computer Science
Degree GrantorEngineering and Computer Science
Degree ProgramElectrical Engineering
Graduation Date2006-12-01
TypeMaster's thesis
Access LevelPublic - Allow Worldwide Access
Release Date2007-01-11
RepositoryUniversity Archives
Repository CollectionElectronic Theses and Dissertations
IdentifierCFE0001393
Access Linkhttp://purl.fcla.edu/fcla/etd/CFE0001393

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