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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 13427–13437

Simulation study on light propagation in an anisotropic turbulence field of entrainment zone

Renmin Yuan, Jianning Sun, Tao Luo, Xuping Wu, Chen Wang, and Yunfei Fu  »View Author Affiliations


Optics Express, Vol. 22, Issue 11, pp. 13427-13437 (2014)
http://dx.doi.org/10.1364/OE.22.013427


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Abstract

The convective atmospheric boundary layer was modeled in the water tank. In the entrainment zone (EZ), which is at the top of the convective boundary layer (CBL), the turbulence is anisotropic. An anisotropy coefficient was introduced in the presented anisotropic turbulence model. A laser beam was set to horizontally go through the EZ modeled in the water tank. The image of two-dimensional (2D) light intensity fluctuation was formed on the receiving plate perpendicular to the light path and was recorded by the CCD. The spatial spectra of both horizontal and vertical light intensity fluctuations were analyzed. Results indicate that the light intensity fluctuation in the EZ exhibits strong anisotropic characteristics. Numerical simulation shows there is a linear relationship between the anisotropy coefficients and the ratio of horizontal to vertical fluctuation spectra peak wavelength. By using the measured temperature fluctuations along the light path at different heights, together with the relationship between temperature and refractive index, the one-dimensional (1D) refractive index fluctuation spectra were derived. The anisotropy coefficients were estimated from the 2D light intensity fluctuation spectra modeled by the water tank. Then the turbulence parameters can be obtained using the 1D refractive index fluctuation spectra and the corresponding anisotropy coefficients. These parameters were used in numerical simulation of light propagation. The results of numerical simulations show this approach can reproduce the anisotropic features of light intensity fluctuations in the EZ modeled by the water tank experiment.

© 2014 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: April 1, 2014
Revised Manuscript: May 16, 2014
Manuscript Accepted: May 17, 2014
Published: May 27, 2014

Citation
Renmin Yuan, Jianning Sun, Tao Luo, Xuping Wu, Chen Wang, and Yunfei Fu, "Simulation study on light propagation in an anisotropic turbulence field of entrainment zone," Opt. Express 22, 13427-13437 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-11-13427


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