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

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

Resultado de la investigación: Capítulo del libro/informe/acta de congresoContribución a la conferenciarevisión exhaustiva

2 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Título de la publicación alojadaOptics in Atmospheric Propagation and Adaptive Systems XII
DOI
EstadoPublicada - 2009
Publicado de forma externa
EventoOptics in Atmospheric Propagation and Adaptive Systems XII - Berlin, Alemania
Duración: 1 sept. 20093 sept. 2009

Serie de la publicación

NombreProceedings of SPIE - The International Society for Optical Engineering
Volumen7476
ISSN (versión impresa)0277-786X

Conferencia

ConferenciaOptics in Atmospheric Propagation and Adaptive Systems XII
País/TerritorioAlemania
CiudadBerlin
Período1/09/093/09/09

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