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Characterization of underwater optical turbulence on the example of the Rayleigh-Benard water tank

: Gladysz, Szymon; Barros, Rui; Kanaev, Andrey V.; Hou, Weilin


Stein, Karin (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optics in Atmospheric Propagation and Adaptive Systems XX : 11-14 September 2017, Warsaw, Poland
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10425)
Paper 1042507, 9 pp.
Conference "Optics in Atmospheric Propagation and Adaptive Systems" <20, 2017, Warsaw>
Conference Paper
Fraunhofer IOSB ()
underwater turbulence; tilt anisoplanatism; image motion

For many years sound has been used as a primary method for underwater communication. However, data transmission rate of acoustic systems is low because typical frequencies associated with underwater acoustics are between tens of hertz and hundreds of kilohertz. A higher bandwidth can be achieved with visible light to transfer data underwater. The first challenge for underwater laser communication is scattering and absorption. In addition, there are disturbances caused by spatial and temporal changes in the water refraction index due to temperature and/or salinity variations. Optical turbulence, which includes the two effects, is the main theme of this paper. We will discuss the joint IOSB-NRL experiment whose goal was to test techniques for characterization of underwater optical turbulence and in particular we will focus on differential motion measurement from an LED array.