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Proceedings Paper

Using ultrasonic anemometers for temperature measurements and implications on Cn2
Author(s): Detlev Sprung; Erik Sucher; Peter Grossmann; Thomas Kociok; Alexander M. J. van Eijk; Karin Stein
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Paper Abstract

High frequency fluctuations in the refractive index are the main atmospheric influence on wave propagation in the atmosphere. They are caused mainly from variations in atmospheric temperature. Ultrasonic anemometers have been established as common tools in performing in-situ measurements of turbulence. They were used as fixed point instruments from towers, for the characterization of local turbulence or from mobile platforms. Besides wind velocity fluctuations, high frequency variations of the sonic temperature are analyzed. Time series of temperature data are analyzed to derive the structure function of temperature CT 2, that should be proportional the strength of optical turbulence Cn 2. The application of the Fast Fourier transformation, temporal resolution and averaging time are addressed to show the applicability of ultrasonic anemometers. Also the influence of humidity fluctuations on the determination of Cn 2 in applications over land and over the sea is discussed. Errors in the applications from fixed points as well as from mobile platforms are estimated for different types of anemometers.

Paper Details

Date Published: 11 October 2019
PDF: 10 pages
Proc. SPIE 11153, Environmental Effects on Light Propagation and Adaptive Systems II, 111530B (11 October 2019);
Show Author Affiliations
Detlev Sprung, Fraunhofer Institute of Optronics, System Technologies, and Image Exploitation - IOSB (Germany)
Erik Sucher, Fraunhofer Institute of Optronics, System Technologies, and Image Exploitation - IOSB (Germany)
Peter Grossmann, Fraunhofer Institute of Optronics, System Technologies, and Image Exploitation - IOSB (Germany)
Thomas Kociok, Fraunhofer Institute of Optronics, System Technologies, and Image Exploitation - IOSB (Germany)
Alexander M. J. van Eijk, Fraunhofer Institute of Optronics, System Technologies, and Image Exploitation - IOSB (Germany)
TNO (Netherlands)
Karin Stein, Fraunhofer Institute of Optronics, System Technologies, and Image Exploitation - IOSB (Germany)


Published in SPIE Proceedings Vol. 11153:
Environmental Effects on Light Propagation and Adaptive Systems II
Karin U. Stein; Szymon Gladysz, Editor(s)

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