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Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence
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Light propagation through anisotropic turbulence.

Italo Toselli1, Brij Agrawal, Sergio Restaino

  • 1Mechanical and Astronautical Engineering Department, Naval Postgraduate School, Monterey, California 93943, USA. itoselli@nps.edu

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|March 9, 2011
PubMed
Summary
This summary is machine-generated.

Atmospheric turbulence can be anisotropic, deviating from standard models. This study quantifies anisotropic turbulence effects on beam spread and scintillation using a non-Kolmogorov spectrum.

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Area of Science:

  • Physics
  • Optics
  • Atmospheric Science

Background:

  • Experimental data confirm atmospheric turbulence is often anisotropic.
  • Kolmogorov spectrum inadequately describes anisotropic turbulence statistics.
  • Anisotropic turbulence impacts optical wave propagation.

Purpose of the Study:

  • To quantitatively analyze anisotropic turbulence.
  • To investigate the influence of non-Kolmogorov spectrum parameters on optical wave propagation.
  • To determine the relationship between anisotropic turbulence and beam characteristics.

Main Methods:

  • Utilized a non-Kolmogorov power spectrum with an anisotropic coefficient.
  • Analyzed weak turbulence conditions for horizontal propagation.
  • Calculated long-term beam spread and scintillation index variations.
  • Assumed circular symmetry in the plane orthogonal to propagation.

Main Results:

  • The power-law slope (α) significantly affects beam spread and scintillation.
  • Anisotropic coefficient (ς) modulates these effects.
  • A quantitative relationship ς(2-α) was derived for the influence of anisotropy.

Conclusions:

  • Anisotropic turbulence requires non-Kolmogorov models for accurate analysis.
  • The anisotropic coefficient is a critical factor in optical wave propagation through turbulence.
  • The derived factor ς(2-α) provides a predictive tool for beam spread and scintillation.