EXPERIMENTAL CHARACTERIZATION OF ATMOSPHERIC TURBULENCE SUPPORTED BY ADVANCED PHASE SCREEN SIMULATIONS

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dc.contributor.advisorDavis, Christopher Cen_US
dc.contributor.authorPAULSON, DANIEL Aen_US
dc.contributor.departmentElectrical Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2020-07-13T05:35:16Z
dc.date.available2020-07-13T05:35:16Z
dc.date.issued2020en_US
dc.description.abstractCharacterization of optical propagation through the low turbulent atmosphere has been a topic of scientific investigation for decades, and has important engineering applications in the fields of free space optical communications, remote sensing, and directed energy. Traditional theories, starting with early radio science, have flowed down from the assumption of three dimensional statistical symmetry of so-called fully developed, isotropic turbulence. More recent experimental results have demonstrated that anisotropy and irregular frequency domain characteristics are regularly observed near boundaries of the atmosphere, and similar findings have been reported in computational fluid dynamics literature. We have used a multi-aperture transmissometer in field testing to characterize atmospheric transparency, refractive index structure functions, and turbulence anisotropy near atmospheric boundaries. Additionally, we have fielded arrays of resistive temperature detector probes alongside optical propagation paths to provide direct measurements of temperature and refractive index statistics supporting optical turbulence observations. We are backing up these experimental observations with a modified algorithm for modeling optical propagation through atmospheric turbulence. Our new phase screen approach utilizes a randomized spectral sampling algorithm to emulate the turbulence energy spectrum and improve modeling of low frequency fluctuations and improve convergence with theory. We have used the new algorithm to investigate open theoretical topics, such as the behavior of beam statistics in the strong fluctuation regime as functions of anisotropy parameters, and energy spectrum power law behavior. These results have to be leveraged in order to develop new approaches for characterization of atmospheric optical turbulence.en_US
dc.identifierhttps://doi.org/10.13016/081l-xgc6
dc.identifier.urihttp://hdl.handle.net/1903/26263
dc.language.isoenen_US
dc.subject.pqcontrolledOpticsen_US
dc.subject.pqcontrolledAtmospheric sciencesen_US
dc.subject.pqcontrolledElectromagneticsen_US
dc.subject.pquncontrolledatmosphericen_US
dc.subject.pquncontrolledexperimental physicsen_US
dc.subject.pquncontrolledsignal processingen_US
dc.subject.pquncontrolledsimulationen_US
dc.subject.pquncontrolledturbulenceen_US
dc.subject.pquncontrolledwave opticsen_US
dc.titleEXPERIMENTAL CHARACTERIZATION OF ATMOSPHERIC TURBULENCE SUPPORTED BY ADVANCED PHASE SCREEN SIMULATIONSen_US
dc.typeDissertationen_US

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