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Measuring non-Kolmogorov turbulence

: Gladysz, Szymon; Stein, Karin; Sucher, Erik; Sprung, Detlev

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Created on: 5.11.2013

Stein, K.; Gonglewski, John D. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Remote Sensing of Clouds and the Atmosphere XVIII and Optics in Atmospheric Propagation and Adaptive Systems XVI : Dresden, Germany, September 23, 2013
Bellingham, WA: SPIE, 2013 (Proceedings of SPIE 8890)
ISBN: 978-0-8194-9759-8
Paper 889013
Conference "Remote Sensing of Clouds and the Atmosphere" <18, 2013, Dresden>
Conference "Optics in Atmospheric Propagation and Adaptive Systems" <16, 2013, Dresden>
Conference Paper, Electronic Publication
Fraunhofer IOSB ()
imaging through turbulence; adaptive optics; urban turbulence; free space optical communications

We have performed a series of experiments aiming at understanding the statistics of deep turbulence over cities. The experimental setup consisted of a Shack-Hartmann wavefront sensor and an imaging camera that simultaneously recorded wavefront-, and focal-plane data, respectively. At the same time, measurements of deep optical turbulence were performed at the urban area of interest using two large-aperture scintillometer systems to get an impression of the strength of Cn2 above the rooftops of Ettlingen. Our focus is "urban" turbulence because we are interested in the usefulness of adaptive optics for free-space optical communications over urban areas. We discuss methods of determining departure from Kolmogorov turbulence. Our "last mile problem" is that urban turbulence can be significantly stronger, in the sense of flatter power spectrum, compared to the classic Kolmogorov turbulence. This could pose a significant challenge for adaptive optics systems.