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- W1976585279 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 C<sub>T</sub><sup>2</sup>, and the results transmitted to a ground receiving site. These data are converted to the index of refraction structure constant, C<sub>n</sub><sup>2</sup>. 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." @default.
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- W1976585279 date "2009-08-20" @default.
- W1976585279 modified "2023-10-17" @default.
- W1976585279 title "The balloon ring: a high-performance low-cost instrumentation platform for measuring atmospheric turbulence profiles" @default.
- W1976585279 doi "https://doi.org/10.1117/12.827540" @default.
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