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

Darío G. Pérez; Luciano Zunino; Damián Gulich; Gustavo Funes; Mario Garavaglia

doi:10.1117/12.830234

1 October 2009 Turbulence characterization by studying laser beam wandering in a differential tracking motion setup

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

Proceedings Volume 7476, Optics in Atmospheric Propagation and Adaptive Systems XII; 74760D (2009) https://doi.org/10.1117/12.830234
Event: SPIE Remote Sensing, 2009, Berlin, Germany

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.

Citation Download Citation

Darío G. Pérez, Luciano Zunino, Damián Gulich, Gustavo Funes, and Mario Garavaglia "Turbulence characterization by studying laser beam wandering in a differential tracking motion setup", Proc. SPIE 7476, Optics in Atmospheric Propagation and Adaptive Systems XII, 74760D (1 October 2009); https://doi.org/10.1117/12.830234

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available