Turbulence characterization by studying laser beam wandering in a differential tracking motion setup

DARIO GABRIEL PEREZ , Luciano Zunino, Damían Gulich, Gustavo Funes, Mario Garavaglia

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The Differential Image Motion Monitor (DIMM) is a standard and widely used instrument for astronomical seeing measurements. The seeing values are estimated from the variance of the differential image motion over two equal small pupils some distance apart. The twin pupils are usually cut in a mask on the entrance pupil of the telescope. As a differential method, it has the advantage of being immune to tracking errors, eliminating erratic motion of the telescope. The Differential Laser Tracking Motion (DLTM) is introduced here inspired by the same idea. Two identical laser beams are propagated through a path of air in turbulent motion, at the end of it their wander is registered by two position sensitive detectors-at a count of 800 samples per second. Time series generated from the difference of the pair of centroid laser beam coordinates is then analyzed using the multifractal detrended fluctuation analysis. Measurements were performed at the laboratory with synthetic turbulence: changing the relative separation of the beams for different turbulent regimes. The dependence, with respect to these parameters, and the robustness of our estimators is compared with the non-differential method. This method is an improvement with respect to previous approaches that study the beam wandering.

Original languageEnglish
Title of host publicationOptics in Atmospheric Propagation and Adaptive Systems XII
DOIs
StatePublished - 4 Nov 2009
EventOptics in Atmospheric Propagation and Adaptive Systems XII - Berlin, Germany
Duration: 1 Sep 20093 Sep 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7476
ISSN (Print)0277-786X

Conference

ConferenceOptics in Atmospheric Propagation and Adaptive Systems XII
CountryGermany
CityBerlin
Period1/09/093/09/09

Keywords

  • Angle-of-arrival
  • Differential beam wandering
  • Multifractal detrended fluctuation analysis
  • Turbulence
  • Turbulent wave-front phase

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