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Proceedings Paper

Measuring parameters of ground-level atmospheric turbulence via Fourier telescopy
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Paper Abstract

Scientists continually seek to improve atmospheric turbulence models. Employing Fourier telescopy techniques, we have assessed the effect of humidity, temperature, atmospheric pressure, and airflow velocity on horizontal-path, ground-level turbulence. The measurements were made at different times of day. Turbulence parameters investigated include Cn2, the scintillation index σ2I, and the inner scale l0 . The results showed temporal movement patterns of the turbulence to be consistent with Taylor’s frozen turbulence theory. We plan to compare the results of these outdoor measurements with measurements conducted indoors with an optical turbulence generator. Fourier telescopy measurements rely on the distant interference of two mutually-coherent and frequency-offset laser beams, the resulting moving interference fringe pattern “beating” against a fixed grating, such as a Ronchi ruling, and yielding a photo-detected signal that can be analyzed statistically to infer turbulence parameters. Preliminary study suggests that the Fourier telescopy-based measurements can provide more information on turbulence parameters than can measurements made with single laser beams. The basic experimental setup will be described, along with results of the experiments.

Paper Details

Date Published: 4 October 2018
PDF: 8 pages
Proc. SPIE 10799, Emerging Imaging and Sensing Technologies for Security and Defence III; and Unmanned Sensors, Systems, and Countermeasures, 107990F (4 October 2018); doi: 10.1117/12.2323990
Show Author Affiliations
Omar J. Tíjaro Rojas, Univ. Industrial de Santander (Colombia)
Yezid Torres Moreno, Univ. Industrial de Santander (Colombia)
William T. Rhodes, Florida Atlantic Univ. (United States)

Published in SPIE Proceedings Vol. 10799:
Emerging Imaging and Sensing Technologies for Security and Defence III; and Unmanned Sensors, Systems, and Countermeasures
Gerald S. Buller; Markus Mueller; Richard C. Hollins; Robert A. Lamb, Editor(s)

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