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Proceedings Paper

Using experimental data from a balloon experiment to assess optical performance
Author(s): Timothy T. Clark; Christopher A. Clarke
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Paper Abstract

Recent measurements of atmospheric optical turbulence from a novel balloon experiment showed some atmospheric turbulence behaviors that departed significantly from the Kolmogorov theory. In many cases, at various altitudes, the turbulence showed no inertial range scaling, thus assigning a value of C2N to the turbulence was not possible. The actual distributions of the intensity of the turbulence did not match what would be expected from the typical profiles of C2N . To assess the optical effects of the measured turbulence, the temperature data measured by the balloon-mounted equipment is converted to refractive index data using standard, published conversion factors. The resulting refractive index structure functions at the various altitudes are then used to compute phase-perturbations structure functions. These are then used to generate phase screens, which are then used in a wave-optics propagation code to compute the point-spread function of a point source located at the highest elevation of the data set propagating to the lowest elevation of the data set. The results are then compared to similar results for a Clear One profile and a Hufnagel-Valley profile applied to Kolmogorov turbulence. The results indicate that the recently measured turbulence environment is relatively optically benign compared to either Clear One or Hufnagel-Valley.

Paper Details

Date Published: 12 August 2009
PDF: 10 pages
Proc. SPIE 7463, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation III, 74630A (12 August 2009); doi: 10.1117/12.827579
Show Author Affiliations
Timothy T. Clark, Tau Technologies (United States)
Christopher A. Clarke, Tau Technologies (United States)

Published in SPIE Proceedings Vol. 7463:
Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation III
Stephen M. Hammel; Alexander M. J. van Eijk; Mikhail A. Vorontsov, Editor(s)

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