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  4. Using ultrasonic anemometers for temperature measurements and implications on Cn2
 
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2019
Conference Paper
Titel

Using ultrasonic anemometers for temperature measurements and implications on Cn2

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.
Author(s)
Sprung, Detlev
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Sucher, Erik
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Grossmann, Peter
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Kociok, Thomas
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Eijk, Alexander M.J. van
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Stein, Karin
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Hauptwerk
Environmental Effects on Light Propagation and Adaptive Systems II
Konferenz
Conference "Environmental Effects on Light Propagation and Adaptive Systems" 2019
Thumbnail Image
DOI
10.1117/12.2534023
Language
English
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Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Tags
  • optical turbulence

  • ultrasonic anemometer

  • data analysis

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