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Proceedings Paper

The balloon ring: a high-performance low-cost instrumentation platform for measuring atmospheric turbulence profiles
Author(s): Demos T. Kyrazis; Frank D. Eaton; Don G. Black; Wiley T. Black; Alastair Black
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Paper Abstract

Balloons, similar to those used for meteorological observations, are commonly used to carry a small instrumentation package for measuring optical turbulence in the atmosphere as a function of altitude. Two temperature sensors, one meter apart, measure a single point of the temperature structure function. The raw data is processed to provided the value of CT2, and the results transmitted to a ground receiving site. These data are converted to the index of refraction structure constant, Cn2. The validity of these measurements depend on the correctness of a number of assumptions. These include local isotropy of the turbulence and the existence of the Kolmogorov inertial subrange, and that the data is not contaminated by the wake of the ascending balloon. A variety of experiments on other platforms, and in the laboratory, demonstrate that the assumptions upon which these balloon measurements are made are not valid for a large percentage of the above described flights. In order to collect data whose interpretation did not require preconceived assumptions, the balloon ring instrumentation system was developed. The ring is 8.69 meters in diameter, with a cross-sectional diameter of 14 cm. The ring is hung just below the balloon, so that the wake goes through the center of the ring, and the sensors are mounted tangent to the circumference of the ring. The raw data is transmitted to the ground with a bandwidth extending to 1.25 kHz. A sample of the measurements taken during a flight at Vandenberg Air Force Base, Calif. is presented.

Paper Details

Date Published: 12 August 2009
PDF: 12 pages
Proc. SPIE 7463, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation III, 746308 (12 August 2009); doi: 10.1117/12.827540
Show Author Affiliations
Demos T. Kyrazis, R-Cubed, Inc. (United States)
Frank D. Eaton, Air Force Research Lab. (United States)
Don G. Black, Ridgeline LLC (United States)
Wiley T. Black, Ridgeline LLC (United States)
Alastair Black, R-Cubed, Inc. (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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