Measuring inner scale of atmospheric turbulence by angle of arrival and scintillation

Consortini, A.; Sun, Yi Yi; Innocenti, Claudia; Li, Zhi Ping

doi:10.1016/s0030-4018(02)02294-0

Cited by 51 publications

(24 citation statements)

References 6 publications

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“…By changing the diameter of the receiving aperture, we select the different turbulent scales, i.e., different eddies contributing to the wavefront tilt. In similar experiments, the inner scale has been reported to be of the order of a few millimeters 24 while the outer scale was about a hundred millimeters 25 . Thus it can be assumed that all our aperture sizes are in inertial range.…”

Section: Resultsmentioning

confidence: 76%

Study of Wavefront Tilt Variance with Various Telescope Apertures in Indoor Convective Turbulence

et al. 2018

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Turbulent atmosphere produces random wavefront tilts in the propagating laser beam and the dynamics of turbulence largely depends on the receiving optics aperture size. In this paper, wavefront tilt variance is studied with various telescope aperture sizes in indoor convective turbulence. A simple experimental setup is described for simulating the near ground atmospheric turbulence by generating different strengths of convective turbulence in the laboratory. A laser beam is made to propagate through the turbulence subsequently induced wavefront tilt variances are experimentally measured and analysed statistically. The wavefront tilt variance is used to estimate the temporal characteristics using Fourier transform by varying aperture sizes and turbulence strengths (i.e. ambient, weak and moderate). The Hurst exponent, the Fried parameter and the wavefront tilt frequencies for the different turbulence strengths are calculated. The power dependence of the wavefront tilt variance on the telescope aperture size is studied and a deviation from the classical D -1/3 dependence is reported.

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Section: Resultsmentioning

confidence: 76%

Study of Wavefront Tilt Variance with Various Telescope Apertures in Indoor Convective Turbulence

et al. 2018

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“…The inner scale of turbulence 0 , being the scale at which energy is dissipated by atmospheric turbulence convection, is of fundamental importance in determining surface fluxes of heat and momentum [7].…”

Section: Inner Scale Calculationmentioning

confidence: 99%

“…Supposing a plane wave that propagates through the homogeneous and isotropic turbulence, due to we acquire data in a small sensor, within the limits of geometrical optics approximation, that means for ≪ 0 2 / , where L is the path length, 0 the inner scale and the wavelength, the mean square fluctuations of the arrival angle is given by [7]: …”

Section: 43mentioning

confidence: 99%

Atmospheric turbulence temperature on the laser wavefront properties

López

Diaz

Rojas

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. Temperature is a physical magnitude that if is higher, the refractive index presents more important random fluctuations, which produce a greater distortion in the wavefront and thus a displacement in its centroid. To observe the effect produced by the turbulent medium strongly influenced by temperature on propagation laser beam, we experimented with two variable and controllable temperature systems designed as optical turbulence generators (OTG): a Turbulator and a Parallelepiped glass container. The experimental setup use three CMOS cameras and four temperature sensors spatially distributed to acquire synchronously information of the laser beam wavefront and turbulence temperature, respectively. The acquired information was analyzed with MATLAB® software tool, that it allows to compute the position, in terms of the evolution time, of the laser beam center of mass and their deviations produced by different turbulent conditions generated inside the two manufactured systems. The results were reflected in the statistical analysis of the centroid shifting.

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“…As a result of the fluctuating nature of the refractive index in a turbulent medium any laser beam that propagates through it experiments transversal deflections, which arise from the beam phase fluctuations. Obviously, they are very sensitive to turbulence; therefore, characteristic scales and parameters associated to the turbulence were derived from them, such as the inner scale /Q [45][46][47][48], the outer scale ZQ [49], the refractive index stmcture constant C\ [48,50], and the Fried coherence length or TQ parameter [50]. For a thin beam whose diameter is smaller than /o [51], the deflections are due to all the scales of the turbulence.…”

Section: Fflm and Mbm Models And The Wavelet Formalism Applied In La mentioning

confidence: 99%

Ten Years of Research on Light Propagation through a Turbulent Atmosphere

Zunino¹,

Pérez²,

Garavaglia³

et al. 2008

AIP Conference Proceedings

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Measuring inner scale of atmospheric turbulence by angle of arrival and scintillation

Cited by 51 publications

References 6 publications

Study of Wavefront Tilt Variance with Various Telescope Apertures in Indoor Convective Turbulence

Study of Wavefront Tilt Variance with Various Telescope Apertures in Indoor Convective Turbulence

Atmospheric turbulence temperature on the laser wavefront properties

Ten Years of Research on Light Propagation through a Turbulent Atmosphere

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