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

Darío G. Pérez, Luciano Zunino, Damían Gulich, Gustavo Funes, Mario Garavaglia

Research output: Contribution to conferencePaper

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 languageAmerican English
DOIs
StatePublished - 4 Nov 2009
Externally publishedYes
EventProceedings of SPIE - The International Society for Optical Engineering -
Duration: 1 Jan 2019 → …

Conference

ConferenceProceedings of SPIE - The International Society for Optical Engineering
Period1/01/19 → …

Keywords

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

Fingerprint Dive into the research topics of 'Turbulence characterization by studying laser beam wandering in a differential tracking motion setup'. Together they form a unique fingerprint.

Cite this