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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 9 — May. 1, 2010
  • pp: 1470–1472

Use of a moiré deflectometer on a telescope for atmospheric turbulence measurements

Saifollah Rasouli  »View Author Affiliations

Optics Letters, Vol. 35, Issue 9, pp. 1470-1472 (2010)

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An instrument has been built for the study of the atmospheric turbulence by measuring the fluctuation of the angle of arrival across a telescope aperture using moiré deflectometry. A slightly divergent laser beam passes through a turbulent ground level atmosphere and enters the telescope aperture. The laser beam is recollimated behind the telescope’s focal point by means of a collimator. The collimated beam passes through a moiré deflectometer. The fluctuating self-image of the first grating is formed on the second grating of the moiré deflectometer and fluctuating moiré fringes are formed. Using moiré fringe fluctuations we have calculated the fluctuations of the angle of arrival, the Fried’s parameter r 0 , and the atmospheric refractive index structure constant. Because of the magnifications of the telescope and moiré deflectometry, the precision of the technique can potentially be 1 order of magnitude more precise than previous methods.

© 2010 Optical Society of America

OCIS Codes
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(100.2650) Image processing : Fringe analysis
(110.6760) Imaging systems : Talbot and self-imaging effects
(110.6770) Imaging systems : Telescopes
(120.4120) Instrumentation, measurement, and metrology : Moire' techniques

ToC Category:
Imaging Systems

Original Manuscript: January 19, 2010
Revised Manuscript: March 7, 2010
Manuscript Accepted: March 16, 2010
Published: April 30, 2010

Saifollah Rasouli, "Use of a moiré deflectometer on a telescope for atmospheric turbulence measurements," Opt. Lett. 35, 1470-1472 (2010)

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  1. S. Rasouli and M. T. Tavassoly, Opt. Lett. 31, 3276 (2006). [CrossRef] [PubMed]
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