Multiscale permutation entropy analysis of laser beam wandering in isotropic turbulence
| Autor: | Darío G. Pérez, Felipe Olivares, Damián Gulich, Luciano Zunino, Osvaldo A. Rosso |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Ciencias Físicas
Ingeniería ISOTROPIC TURBULENCE FOS: Physical sciences Stochastic dynamical systems Time series analysis Multiple time scale dynamics Otras Ciencias Físicas 01 natural sciences law.invention 010309 optics purl.org/becyt/ford/1 [https] Entropic sampling methods MULTISCALE PERMUTATION ENTROPY law 0103 physical sciences Statistical physics 010306 general physics Scaling Brownian motion Ciencias Exactas Condensed Matter - Statistical Mechanics Mathematics Hurst exponent Fractional Brownian motion Statistical Mechanics (cond-mat.stat-mech) Turbulence Stochastic process Isotropy Fluid Dynamics (physics.flu-dyn) Física purl.org/becyt/ford/1.3 [https] Physics - Fluid Dynamics Laser Classical mechanics Physics - Data Analysis Statistics and Probability LASER BEAM WANDERING Data Analysis Statistics and Probability (physics.data-an) CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| Popis: | We have experimentally quantified the temporal structural diversity from the coordinate fluctuations of a laser beam propagating through isotropic optical turbulence. The main focus here is on the characterization of the long-range correlations in the wandering of a thin Gaussian laser beam over a screen after propagating through a turbulent medium. To fulfill this goal, a laboratory-controlled experiment was conducted in which coordinate fluctuations of the laser beam were recorded at a sufficiently high sampling rate for a wide range of turbulent conditions. Horizontal and vertical displacements of the laser beam centroid were subsequently analyzed by implementing the symbolic technique based on ordinal patterns to estimate the well-known permutation entropy. We show that the permutation entropy estimations at multiple time scales evidence an interplay between different dynamical behaviors. More specifically, a crossover between two different scaling regimes is observed. We confirm a transition from an integrated stochastic process contaminated with electronic noise to a fractional Brownian motion with a Hurst exponent H=5/6 as the sampling time increases. Besides, we are able to quantify, from the estimated entropy, the amount of electronic noise as a function of the turbulence strength. We have also demonstrated that these experimental observations are in very good agreement with numerical simulations of noisy fractional Brownian motions with a well-defined crossover between two different scaling regimes. Facultad de Ingeniería Centro de Investigaciones Ópticas Instituto de Física de Líquidos y Sistemas Biológicos |
| Databáze: | OpenAIRE |
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