Modified Method to Detect the Turbulent Layers in the Atmospheric Boundary Layer for the Large Solar Vacuum Telescope

Shikhovtsev, A. Yu.; Kovadlo, P. G.; Kiselev, Alexander V.; Kolobov, D. Yu.; Лукин, В. П.; Russkikh, I. V.; Shikhovtsev, Maxim Y.

doi:10.3390/atmos12020159

Cited by 8 publications

(3 citation statements)

References 25 publications

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“…The design and optimization of the multiconjugated adaptive optics system require a detailed knowledge about optical turbulence integral parameters 3 as well as vertical profiles of optical turbulence. [4][5][6][7][8][9][10][11][12][13] Moreover, we should know also vertical profiles of optical turbulence and atmospheric situation on the large spatial scales for forecasting wavefront distortions and planning of observing time.…”

Section: Introductionmentioning

confidence: 99%

Correction of wavefront distortions in wide-field adaptive optics systems

Shikhovtsev,

Kovadlo,

Chuprakov

et al. 2023

29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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In this paper, wide-field adaptive optics systems for ground-based solar telescopes are discussed. The features of constructing adaptive optics systems based on layer- and object-oriented approaches are considered. It is shown that the optimal adaptive optics system for the Large Solar Vacuum Telescope (LSVT) should be created on the basis of optical conjugation of deformable mirrors with turbulent layers of the atmosphere, the system for determining wavefront aberrations should be based on the use of a set of a narrow field of view sensors conjugated with telescope aperture, as well as a multi-directional wavefront sensor for turbulence tomography, designed on the basis of an object-oriented approach (measurements of wavefront aberrations in different directions). The schemes of pupil imagers that provide optical conjugation of the LSVT wavefront sensor with heights of 3 km as well as the upper atmospheric levels are considered. Direct optical conjugation of the Shack-Hartmann sensor with a turbulent layer is limited by a height of about 3 km (due to significant vignetting).

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Section: Introductionmentioning

confidence: 99%

Correction of wavefront distortions in wide-field adaptive optics systems

Shikhovtsev,

Kovadlo,

Chuprakov

et al. 2023

29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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“…This method has primarily been used in nighttime astronomical observations and gradually employed in daytime solar observations based on wide-field wavefront sensors [26]. In 2021, Artem et al [27] incorporated temporal movement to supplement the spatial guide region by utilizing a single field of view of the Shack-Hartmann wavefront sensor. This offers a fresh approach to developing the SLODAR method.…”

Section: Introductionmentioning

confidence: 99%

A Real-Time Measurement System for Atmospheric Turbulence Intensity and Distribution Based on the GLAO System

Ran,

Zhang,

Bao

et al. 2023

Applied Sciences

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Measuring the intensity and distribution of atmospheric optical turbulence at large-aperture astronomical telescope sites is crucial to optimizing turbulence correction for different layers. A real-time measurement of turbulence distribution in large-aperture telescopes would be valuable for the parameter optimization of adaptive optics (AO) systems, especially for large field-of-view AO systems such as multi-conjugate adaptive optics (MCAO) and ground-layer adaptive optics (GLAO). Based on the GLAO system of NVST at FSO, a real-time measurement system was deployed to assess the site’s atmospheric turbulence intensity and distribution. This system is, to our knowledge, the first real-time turbulence parameter measurement system in the world with an AO system. We adopt pseudo-open loop methods to restore the turbulence information from the close-loop data of GLAO and measure the turbulence strength and distribution. Multiple subaperture pairs are used instead of a pair of subapertures for fitting calculation to increase the measurement accuracy. Two conventional measurement algorithms, SLODAR and S-DIMM+, are compared with the data from the open-source simulator SOAPY, to cross-verify the correctness of our calculation based on the data process of pseudo-open loop data and multiple subaperture pairs. The simulation results show that for two layers’ turbulence input, approximately 93% of the turbulence is correctly detected with the SLODAR method and the given parameters of wavefront sensors and correctors, while the S-DIMM+ is 87%. Real-time measurements of atmospheric turbulence at the NVST site were carried out on 28 May 2023. The observation results indicated that approximately 80% of the turbulence was located below an altitude of 2000 m; only a few appear in the upper height.

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“…We also used techniques based on the triangulation to measure vertical profiles of optical turbulence. Our paper 13 presents a method to reveal turbulent layers in the atmosphere using cross-correlation analysis of the low-frequency components of the wavefronts in the crossing optical beams.…”

Section: Introductionmentioning

confidence: 99%

Estimating optical turbulence strength using measurements of wavefront distortions

Kovadlo

Shikhovtsev

Kiselev

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The paper describes the results of measuring the structural parameters of optical turbulence for different altitudes in the atmosphere above the Large Solar Vacuum Telescope of the Baikal Astrophysical Observatory. The structural parameters of optical turbulence we estimated from the measurement data of the Shack-Hartmann sensor for individual atmospheric layers by applying the analysis of wavefront distortions in crossed optical beams. To estimate the structural parameters of optical turbulence, we propose an approach based on statistical averaging normalized dimensionless characteristics of turbulence, the Fried parameter and averaged profile of optical turbulence at a given site.

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Modified Method to Detect the Turbulent Layers in the Atmospheric Boundary Layer for the Large Solar Vacuum Telescope

Cited by 8 publications

References 25 publications

Correction of wavefront distortions in wide-field adaptive optics systems

Correction of wavefront distortions in wide-field adaptive optics systems

A Real-Time Measurement System for Atmospheric Turbulence Intensity and Distribution Based on the GLAO System

Estimating optical turbulence strength using measurements of wavefront distortions

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