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Proceedings Paper

An Experiment For Measuring Effect Of Atmospheric Turbulence On A Vertical Optical Path
Author(s): Robert R. Shannon; W.Scott Smith
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Paper Abstract

The experiment to be described is intended to obtain a measure of the limit on the phase coherent propagation of light along a vertical path from a point source. This experiment utilizes an argon laser to generate a pair of coherent point sources in an aircraft. These sources generate a fringe pattern on the ground. As the aircraft flies along a track over a set of ground detectors, a frequency modulated signal is generated in the photoelectric detectors, the frequency modulation being proportional to the phase shift difference along the two paths from the plane. A Fourier transform of the data produces a measure of the phase coherence function or the Atmospheric Transfer Function of the atmospheric path. A modification of the direct experiment uses polarized sources in the transmitter to permit reconstruction of the phase difference function along the paths. From this data, the statistical parameters of the phase structure and log-amplitude behaviour can be obtained.

Paper Details

Date Published: 19 July 1976
PDF: 4 pages
Proc. SPIE 0075, Imaging Through the Atmosphere, (19 July 1976); doi: 10.1117/12.954736
Show Author Affiliations
Robert R. Shannon, University of Arizona (United States)
W.Scott Smith, University of Arizona (United States)

Published in SPIE Proceedings Vol. 0075:
Imaging Through the Atmosphere
James C. Wyant, Editor(s)

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