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Proceedings Paper

A new technique for probing length scales in clear air
Author(s): Christopher C. Davis; Joseph D. Harris; Robert W. Gammon
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Paper Abstract

When light is transmitted through the atmosphere, it can scatter off turbulent vortex filaments in the air that have different densities and indices of refraction. These filaments, or eddies, are distributed through a turbulent air flow and their scale size represents the boundary between an energy cascade down size scales that ends in viscous energy dissipation. We are measuring with high spatial and temporal precision spatial and temporal correlation functions that reveal the turbulence dynamics and inner scale in conditions of single scattering. In essence, we can "see" the shadows of individual turbulent vortices. These measurements are made over short path lengths in conditions of known Reynold's number and average temperature. By changing the characteristics of the air flow in a volume, different length scales can be associated with different conditions. This creates a "fingerprint" that characterizes the turbulence.

Paper Details

Date Published: 12 August 2009
PDF: 8 pages
Proc. SPIE 7463, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation III, 746306 (12 August 2009); doi: 10.1117/12.828126
Show Author Affiliations
Christopher C. Davis, Univ. of Maryland, College Park (United States)
Joseph D. Harris, Univ. of Maryland, College Park (United States)
Robert W. Gammon, Univ. of Maryland, College Park (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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