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Proceedings Paper

Investigation of the height dependency of optical turbulence in the surface layer over False Bay (South Africa)
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Paper Abstract

Atmospheric turbulence impacts on the propagation of electro-optical radiation. Typical manifestations of optical turbulence are scintillation (intensity fluctuations), beam wander and (for laser systems) reduction of beam quality. For longer propagation channels, it is important to characterize the vertical and horizontal distribution (inhomogeneity) of the optical turbulence. In the framework of the First European South African Transmission ExpeRiment (FESTER) optical turbulence was measured between June 2015 and February 2016 over a 1.8 km over-water link over False Bay. The link ran from the Institute of Maritime Technology (IMT) at Simons Town to the lighthouse at Roman Rock Island. Three Boundary layer scintillometers (BLS900) allowed assessing the vertical distribution of optical turbulence at three different heights between 5 and 12 m above the water surface. The expected decrease with Cn2 with height is not always found. These results are analyzed in terms of the meteorological scenario, and a comparison is made with a fourth optical link providing optical turbulence data over a 8.69 km path from IMT to St. James, roughly perpendicular to the three 1.8 km paths.

Paper Details

Date Published: 7 September 2017
PDF: 8 pages
Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 104080U (7 September 2017); doi: 10.1117/12.2275859
Show Author Affiliations
Detlev Sprung, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Alexander M. J. van Eijk, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
TNO Defence, Security and Safety (Netherlands)
Willie Günter, Institute for Maritime Technology (South Africa)
Derek Griffith, Council for Scientific and Industrial Research (South Africa)
Christian Eisele, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Erik Sucher, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Dirk Seiffer, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Karin Stein, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)


Published in SPIE Proceedings Vol. 10408:
Laser Communication and Propagation through the Atmosphere and Oceans VI
Jeremy P. Bos; Alexander M. J. van Eijk; Stephen M. Hammel, Editor(s)

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