A controlled laboratory environment to study EO signal degradation due to underwater turbulence

Silvia Matt, Weilin Hou, Wesley Goode, Guigen Liu, Ming Han, Andrey Kanaev, Sergio Restaino

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Temperature microstructure in the ocean can lead to localized changes in the index of refraction and can distort underwater electro-optical (EO) signal transmission. A similar phenomenon is well-known from atmospheric optics and generally referred to as 'optical turbulence'. Though turbulent fluctuations in the ocean distort EO signal transmission and can impact various underwater applications, from diver visibility to active and passive remote sensing, there have been few studies investigating the subject. To provide a test bed for the study of impacts from turbulent flows on underwater EO signal transmission, and to examine and mitigate turbulence effects, we set up a laboratory turbulence environment allowing the variation of turbulence intensity. Convective turbulence is generated in a large Rayleigh- Bénard tank and the turbulent flow is quantified using high-resolution Acoustic Doppler Velocimeter profilers and fast thermistor probes. The turbulence measurements are complemented by computational fluid dynamics simulations of convective turbulence emulating the tank environment. These numerical simulations supplement the sparse laboratory measurements. The numerical data compared well to the laboratory data and both conformed to the Kolmogorov spectrum of turbulence and the Batchelor spectrum of temperature fluctuations. The controlled turbulence environment can be used to assess optical image degradation in the tank in relation to turbulence intensity, as well as to apply adaptive optics techniques. This innovative approach that combines optical techniques, turbulence measurements and numerical simulations can help understand how to mitigate the effects of turbulence impacts on underwater optical signal transmission, as well as advance optical techniques to probe oceanic processes.

Original languageEnglish (US)
Title of host publicationOcean Sensing and Monitoring VII
EditorsRobert A. Arnone, Weilin W. Hou
PublisherSPIE
ISBN (Electronic)9781628415759
DOIs
StatePublished - 2015
EventOcean Sensing and Monitoring VII - Baltimore, United States
Duration: Apr 21 2015Apr 22 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9459
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherOcean Sensing and Monitoring VII
CountryUnited States
CityBaltimore
Period4/21/154/22/15

Keywords

  • Optical turbulence
  • Rayleigh-Bénard tank
  • computational fluid dynamics
  • numerical simulation
  • oceanic optics
  • temperature measurements
  • turbulence measurements

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Matt, S., Hou, W., Goode, W., Liu, G., Han, M., Kanaev, A., & Restaino, S. (2015). A controlled laboratory environment to study EO signal degradation due to underwater turbulence. In R. A. Arnone, & W. W. Hou (Eds.), Ocean Sensing and Monitoring VII [94590H] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9459). SPIE. https://doi.org/10.1117/12.2177028