A new method for measuring the outer scale of atmospheric turbulence

Sun, Yi Yi; Consortini, A.; Li, Z. P.

doi:10.1080/17455030600791694

Cited by 10 publications

(3 citation statements)

References 3 publications

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“…In the case of stationarity and isotropy, we first used horizontal and vertical lateral fluctuations to test our theory and to obtain information on the strength of turbulence [1,2,3]. Then we developed methods to measure the inner and outer scales of turbulence [4][5][6][7][8][9][10][11] and also to measure the refractive index gradient and its time evolution [12,13]. In the present paper we describe use of thin beams to locally investigate the evolution of the atmospheric turbulence conditions, including sudden transients.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Atmospheric Turbulence Evolution by Thin Laser Beams

Consortini¹,

Ceccarelli²,

Innocenti³

et al. 2008

AIP Conference Proceedings

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Section: Introductionmentioning

confidence: 99%

Monitoring Atmospheric Turbulence Evolution by Thin Laser Beams

Consortini¹,

Ceccarelli²,

Innocenti³

et al. 2008

AIP Conference Proceedings

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“…Measurements of daytime values are sparse but appear to suggest much smaller values between 1 and 10 m [15,16]. A small outer scale benefits layer-oriented MCAO systems since the attenuation of the signal from distant layers is then stronger.…”

Section: B Attenuation Of the Signal From Distant Layersmentioning

confidence: 99%

Layer-oriented adaptive optics for solar telescopes

Kellerer¹

2012

Appl. Opt.

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with the permission of OSA. The paper can be found at the following URL on the OSA website:http://dx.doi.org/10.1364/AO.51.005743. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. First multiconjugate adaptive-optical (MCAO) systems are currently being installed on solar telescopes. The aim of these systems is to increase the corrected field of view with respect to conventional adaptive optics. However, this first generation is based on a star-oriented approach, and it is then difficult to increase the size of the field of view beyond 60-80 arc sec in diameter. We propose to implement the layeroriented approach in solar MCAO systems by use of wide-field Shack-Hartmann wavefront sensors conjugated to the strongest turbulent layers. The wavefront distortions are averaged over a wide field: the signal from distant turbulence is attenuated and the tomographic reconstruction is thus done optically. The system consists of independent correction loops, which only need to account for local turbulence: the subapertures can be enlarged and the correction frequency reduced. Most importantly, a star-oriented MCAO system becomes more complex with increasing field size, while the layer-oriented approach benefits from larger fields and will therefore be an attractive solution for the future generation of solar MCAO systems.

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“…Las mediciones experimentales de estas correlaciones permiten la determinación de la escala interna 0 , y la escala externa L 0 . Posteriores mejoras lograron estimaciones alternativas de la escala externa (Consortini et al, 2002;Sun et al, 2007).…”

Section: Introductionunclassified

Desarrollo, análisis y aplicación de nuevos modelos para la propagación láser en medios turbulentos

Funes¹

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Desde hace varios años se conoce que existen desviaciones de la teorí a cl ásica de turbulencia Kolmogorov. Dichas desviaciones se denominan usualmente turbulencia no-Kolmogorov. Las mismas cubren factores importantes como diferentes pendientes en los espectros, intermitencia, o falla en la hip ótesis de turbulencia congelada, entre otros. De esta forma surge la necesidad de encontrar nuevos modelos que permitan describir estos comportamientos anóomalos y a la vez descifrar de dónde surgen. Si bien puede resultar una tarea compleja, la aplicaci ón de modelos alternativos promueve el avance hacia un entendimiento completo del fen ómeno. Esta tesis doctoral, est á enfocada principalmente en encontrar nuevos modelos para la propagaci ón l áser en medios turbulentos en condiciones no-Kolmogorov. Si bien aquí se muestran dos nuevos modelos exitosos, existen varios que no han sido concluidos, ya sea por complejidad o falta de tiempo. A lo largo de los capí tulos se observar án varios aspectos, que van desde lo experimental hasta lo puramente te órico, sin desviarse del objetivo principal.

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A new method for measuring the outer scale of atmospheric turbulence

Cited by 10 publications

References 3 publications

Monitoring Atmospheric Turbulence Evolution by Thin Laser Beams

Monitoring Atmospheric Turbulence Evolution by Thin Laser Beams

Layer-oriented adaptive optics for solar telescopes

Desarrollo, análisis y aplicación de nuevos modelos para la propagación láser en medios turbulentos

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