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Applied Optics

Applied Optics


  • Vol. 39, Iss. 30 — Oct. 20, 2000
  • pp: 5415–5425

From the grating scale monitor to the generalized seeing monitor

Aziz Ziad, Rodolphe Conan, Andrei Tokovinin, François Martin, and Julien Borgnino  »View Author Affiliations

Applied Optics, Vol. 39, Issue 30, pp. 5415-5425 (2000)

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An instrument named the grating scale monitor for measuring the outer scale ℒ0 from the angle-of-arrival (AA) fluctuations of a perturbed wave front was developed a few years ago at Nice University. The AA is detected with a 5-ms time resolution by modulation of the stellar image in a small telescope with a grating. One uses the normalized covariance of AA fluctuations to estimate ℒ0. A new version of this instrument, the generalized seeing monitor (GSM) is described. It consists of four identical modules for measuring the AA at four locations on the wave front. A spatiotemporal analysis of these data leads to the determination of seeing ∊0, outer scale ℒ0, and the wave-front speed. In addition, isoplanatic angle θ0 is determined from scintillation, making the characterization of turbulence with the GSM almost complete. We describe the instrument and make a detailed analysis of its performance and accuracy. Several site-testing campaigns have been conducted with the GSM: at La Silla (Chile), Oukaïmeden (Morocco), Maidanak (Uzbekistan), and Cerro Pachon and Cerro Paranal (Chile). The main results of these campaigns are presented and discussed.

© 2000 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(010.1350) Atmospheric and oceanic optics : Backscattering

Original Manuscript: October 25, 1999
Revised Manuscript: June 1, 2000
Published: October 20, 2000

Aziz Ziad, Rodolphe Conan, Andrei Tokovinin, François Martin, and Julien Borgnino, "From the grating scale monitor to the generalized seeing monitor," Appl. Opt. 39, 5415-5425 (2000)

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