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MEASURING OPTICAL TURBULENCE PARAMETERS WITH A THREE-APERTURE RECEIVER
| Title: | MEASURING OPTICAL TURBULENCE PARAMETERS WITH A THREE-APERTURE RECEIVER. |
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| Name(s): |
Wayne, David, Author Phillips, Ronald, Committee Chair University of Central Florida, Degree Grantor |
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| Type of Resource: | text | |
| Date Issued: | 2006 | |
| Publisher: | University of Central Florida | |
| Language(s): | English | |
| Abstract/Description: | This 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. | |
| Identifier: | CFE0001393 (IID), ucf:46974 (fedora) | |
| Note(s): |
2006-12-01 M.S.E.E. Engineering and Computer Science, School of Electrical Engineering and Computer Science Masters This record was generated from author submitted information. |
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| Subject(s): |
Atmosphere optical turbulence scintillometer Cn2 inner scale outer scale crosswind three-aperture experiment |
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| Persistent Link to This Record: | http://purl.flvc.org/ucf/fd/CFE0001393 | |
| Restrictions on Access: | public | |
| Host Institution: | UCF |
