Usage of wavefront sensor for estimation of atmospheric turbulence parameters

Andreeva, M. S.; Iroshnikov, N. G.; Koryabin, A. B.; Larichev, A. V.; Shmal'gauzen, V I

doi:10.3103/s8756699012020136

Cited by 9 publications

(9 citation statements)

References 7 publications

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“…The curve gives the cumulative probability value of the Fried parameter, which characterizes the level of integral Accumulated probability (repeatability) of Fried's parameter values and experimental measurements of turbulence parameters, with each other and with the data of an acoustic weather station on various atmospheric paths s of studies that we obtained earlier 12 .…”

Section: Discussionmentioning

confidence: 96%

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Optical and acoustic measurements of atmospheric turbulence on horizontal paths in the atmosphere

Borsilov,

Kazakov,

Konyaev

et al. 2023

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

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The results of full-scale experiments in the atmosphere with various turbulence state meters are considered. In measurements on horizontal open atmospheric paths of various lengths, three optical meters and an acoustic weather station were used. Based on the test results of the meters, a high correlation of turbulence measurements made by optical differential meters DIT-2 and DIT-M as well as the AMK-03 ultrasonic acoustic weather station was shown. Conclusions are drawn about the accuracy and applicability of the meters used to assess the level of turbulence along the atmospheric paths.

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Section: Discussionmentioning

confidence: 96%

“…The third meter used was the Shack-Hartmann wavefront sensor (S-H WFS) based on the Newtonian telescope. The SH-WFS was constructed according to the classical Shack-Hartmann scheme 12 .…”

Section: Optical Measure Equipmentsmentioning

confidence: 99%

Optical and acoustic measurements of atmospheric turbulence on horizontal paths in the atmosphere

Borsilov,

Kazakov,

Konyaev

et al. 2023

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

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“…To achieve this, let us analyze the results of numerical experiments performed in [19,22,25], which analyze the influence of intensity fluctuations and the wavefront dislocations generated by them on the efficiency of correction of turbulent distortions. At the same time, the following two aspects are of both practical and scientific interest.…”

Section: Numerical Experiments On Adaptive Correction Of Turbulent Di...mentioning

confidence: 99%

“…become more than one. Under these conditions, AO phase systems lose their efficiency, and it is no longer possible to achieve any improvement using phase correction [23,25]. To confirm this, we note that in experiments with the Shack-Hartmann wavefront sensor it was discovered [23] that there is a dependence of phase systems on the level of intensity fluctuations, which manifests itself, first of all, in a change in the brightness (scintillation) of focal spots in the Hartmann matrix.…”

Section: Operation Of the Phase Correction System Under Conditions Of...mentioning

confidence: 99%

Features of Adaptive Phase Correction of Optical Wave Distortions under Conditions of Intensity Fluctuations

Lukin

2024

Photonics

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An analysis of the features of measurements and correction of phase distortions in optical waves propagating in the atmosphere at various levels of turbulence was performed. It is shown that with increasing intensity fluctuations, the limiting capabilities of phase correction decrease, and the phase of an optical wave that has passed through a turbulence layer consists of two components: potential and vortex. It was found that even in the region of weak fluctuations there is an overlap of spectral filtering functions for intensity and phase fluctuations. Areas of turbulence inhomogeneities have been identified that will have mutual influence and negatively affect the operation of the phase meter. It is noted that correlation functions, both phase and intensity, are less susceptible to this compared to structural functions. The results of experimental studies on the reconstruction of the wavefront of laser radiation distorted by atmospheric turbulence using a Shack–Hartmann wavefront sensor during vignetting and central screening of the entrance pupil in the optical system are presented. Studies have been carried out on the propagation of laser radiation along a horizontal atmospheric path for various levels of turbulence. The results are analyzed in terms of Zernike polynomials.

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“…The optical part of the Shack-Hartmann sensor consists of an optical raster representing a matrix of diffractive microlenses and a high-resolution video camera installed in the image registration plane of this raster. The wavefront of the optical wave of the reference radiation measured by this WFS was fed in antiphase to the deformable mirror [1,2].…”

Section: Introductionmentioning

confidence: 99%

Experimental studies of phase adaptive correction of optical wave distortions

Bolbasova,

Borzilov,

Kazakov

et al. 2023

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

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The results of experiments on the phase correction of a laser beam propagating in a turbulent atmosphere are presented. A scheme was used in which the laser beam of the main radiation, formed using an adaptive optics system, propagated along a horizontal atmospheric path. To ensure the operation of the AO system, a signal was used from a reference source generated by cw-laser radiation at a wavelength of 0.532 μm, which propagated towards the main one. At the transmitter, the optical beam from the main laser is formed using the adaptive optics system and directed into the atmosphere by the Newton telescope. The main radiation laser is focused through the atmospheric layer into the receiving plane. A reflecting screen, a photodetector based on the small astronomical telescope Celestron, and a reference laser, which propagated towards the main one, were located in this plane.

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Usage of wavefront sensor for estimation of atmospheric turbulence parameters

Cited by 9 publications

References 7 publications

Optical and acoustic measurements of atmospheric turbulence on horizontal paths in the atmosphere

Optical and acoustic measurements of atmospheric turbulence on horizontal paths in the atmosphere

Features of Adaptive Phase Correction of Optical Wave Distortions under Conditions of Intensity Fluctuations

Experimental studies of phase adaptive correction of optical wave distortions

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