Using ultrasonic anemometers for temperature measurements and implications on Cn2

Detlev Sprung; Erik Sucher; Peter Grossmann; Thomas Kociok; Alexander M. J. van Eijk; Karin Stein

doi:10.1117/12.2534023

11 October 2019 Using ultrasonic anemometers for temperature measurements and implications on C_n²

Detlev Sprung, Erik Sucher, Peter Grossmann, Thomas Kociok, Alexander M. J. van Eijk, Karin Stein

Proceedings Volume 11153, Environmental Effects on Light Propagation and Adaptive Systems II; 111530B (2019) https://doi.org/10.1117/12.2534023
Event: SPIE Remote Sensing, 2019, Strasbourg, France

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 C_T ², that should be proportional the strength of optical turbulence C_n 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 C_n 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.

Citation Download Citation

Detlev Sprung, Erik Sucher, Peter Grossmann, Thomas Kociok, Alexander M. J. van Eijk, and Karin Stein "Using ultrasonic anemometers for temperature measurements and implications on C_n²", Proc. SPIE 11153, Environmental Effects on Light Propagation and Adaptive Systems II, 111530B (11 October 2019); https://doi.org/10.1117/12.2534023

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available