Theoretical spatiotemporal analysis of angle of arrival induced by atmospheric turbulence as observed with the grating scale monitor experiment

Ávila, Raúl; Ziad, Aziz; Borgnino, J.; Martin, F.; Agabi, A.; Tokovinin, A.

doi:10.1364/josaa.14.003070

Cited by 74 publications

(64 citation statements)

References 27 publications

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“…19 To determine ᏸ 0 we compute the AA covariance for each baseline ͑six baselines with four GSM modules͒ and normalize it by the differential variance on the 25-cm baseline. These covariances are then compared with von Ká rmá n theoretical normalized covariances, 20 and the appropriate ᏸ 0 is found for each baseline. The final value of ᏸ 0 is taken as the median of the six individual ᏸ 0 values, and its error is estimated as described by Ziad et al 19 …”

Section: A Generalized Seeing Monitormentioning

confidence: 99%

Comparison of measurements of the outer scale of turbulence by three different techniques

Ziad

Schöck²,

Chanan³

et al. 2004

Appl. Opt.

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We have made simultaneous and nearly simultaneous measurements of ᏸ 0 , the outer scale of turbulence, at the Palomar Observatory by using three techniques: angle-of-arrival covariance measurements with the Generalized Seeing Monitor ͑GSM͒, differential-image-motion measurements with the adaptiveoptics system on the Hale 5-m telescope, and fringe speed measurements with the Palomar Testbed Interferometer ͑PTI͒. The three techniques give consistent results, an outer scale of approximately 10 -20 m, despite the fact that the spatial scales of the three instruments vary from 1 m for the GSM to 100 m for the PTI.

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Section: A Generalized Seeing Monitormentioning

confidence: 99%

Comparison of measurements of the outer scale of turbulence by three different techniques

Ziad

Schöck²,

Chanan³

et al. 2004

Appl. Opt.

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“…21 The AOA temporal power spectrum was obtained theoretically and experimentally in several studies. [19][20][21][22][23][24] From the results obtained by Avila et al 20 and Conan et al, 22 AOA fluctuations' temporal spectrum may be calculated. For the case of an outer scale much larger than the pupil diameter, an expression for the AOA correlation time is given by Eq.…”

Section: ͑4͒mentioning

confidence: 97%

“…(5) may be calculated precisely. 19,20 For the more general case, when C n 2 varies along the imaging path, its value that satisfies Eq. (5) 19 It may be numerically obtained from Ref.…”

Section: ͑4͒mentioning

confidence: 99%

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Turbulence strength estimation from an arbitrary set of atmospherically degraded images

Zamek

Yitzhaky

2006

J. Opt. Soc. Am. A

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In remote sensing, atmospheric turbulence and aerosols usually limit the image quality. For many practical cases, turbulence is shown to be dominant, especially for horizontal close-to-earth imaging in hot environments. In a horizontal long-range imaging, it is usually impractical to calculate path-averaged refractive index structure constant C n 2 (which characterizes the turbulence strength) with conventional equipment. We propose a method for estimating C n 2 from the available atmospherically degraded video sequence by calculating temporal intensity fluctuations in spatially high variance areas. Experimental comparison with C n 2 measurements using a scintillometer shows reliable estimation results.

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“…In this equation C α is the normalized spatial covariance which in the case of the von Kàrmàn model for a baseline , a subaperture diameter D (here 6 cm), and a single layer at altitude h is given by Avila et al (1997) as…”

Section: Theoretical Backgroundmentioning

confidence: 99%

First results of the PML monitor of atmospheric turbulence profile with high vertical resolution

Ziad¹,

Blary²,

Borgnino³

et al. 2013

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Aims. Future extremely large telescopes will certainly be equipped with wide-field adaptive optics systems. The optimization of the performances of these techniques requires a precise specification of the different components of these AO systems. Most of these technical specifications are related to the atmospheric turbulence parameters, particularly the profile of the refractive index structure Results. The first prototype of the PML has been installed at Dome C in Antarctica and the first results of the PML are presented and compared to radio-sounding balloon profiles. In addition to the C 2 N (h) profile obtained with high vertical resolution, PML is also able to provide other atmospheric turbulence parameters such as the outer scale profile, the total seeing, and the isoplanatic and isopistonic angles.

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Theoretical spatiotemporal analysis of angle of arrival induced by atmospheric turbulence as observed with the grating scale monitor experiment

Cited by 74 publications

References 27 publications

Comparison of measurements of the outer scale of turbulence by three different techniques

Comparison of measurements of the outer scale of turbulence by three different techniques

Turbulence strength estimation from an arbitrary set of atmospherically degraded images

First results of the PML monitor of atmospheric turbulence profile with high vertical resolution

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