Numerical research of measurements of Shack-Hartmann wavefront sensor according to the parameters of its optical parts and the intensity of turbulent distortions

The wavefront sensor of Hartmann type consists of two parts: the optical and algorithmic. The parameters of the optical part of the sensor may vary. Since the time of “frozen” turbulence due to the Fried’s length and to the cross wind transport turbulent distortion speed, the measurement Shack-Hartmann sensor depend on the intensity of turbulent distortions. In this paper are presented the results of the analysis of the measurements of the sensor according to the size of lens array and to the intensity of turbulent distortions. The analysis is performed on basis of a numerical model of the Shack-Hartmann wavefront sensor and on Kolmogorov’s turbulence model

Analysis of correlation properties of Shack-Hartmann sensor measurements depending on the characteristics of the intensity distribution in the laser beam

The evolution of the turbulent distortion is a random process of the wavefront fluctuations, which can only assess the correlation method. The algorithm for computing of the cross wind transport turbulent distortion speed by the sensor measurement for laser beams propagating through the atmosphere is implemented on the basis of correlation analysis of the centroid coordinates. Correlation properties of sensor measurements are dependent on the characteristics of the intensity distribution in the beam. Studies of this dependence are based on numerical experiments

Adaptive correction of turbulent distortions by MEMS flexible mirror

In astronomy, there is a very important task - distortion correction. The problem is solved by an adaptive mirror with a variable geometry which can be created based on MEMS. The annex to the adaptive optics, MEMS is membrane mirror of small dimensions, but with a large number of controls. The action of external forces on the controls adjusts the mirror surface shape correction for distortion compensation. Force directed at one control element slightly affects the shape of the mirror surface in the areas where the remaining elements. It is shown that for each control of the mirror can be affected, which is proportional to the calculated value of the sensor by measuring the wavefront coming to the input aperture of the system

Investigations of parameters of image quality for adaptive optical systems of BSVT

The criteria image qualities based on wave front aberration caused by atmospheric turbulence using in adaptive optics are summarized. Atmospheric turbulence profile for Big Solar Vacuum Telescope (BSVT) observatory is obtained based on satellite date. On this based the development of adaptive optics systems of BSVT are discussed

Repression against the russian orthodox church in the Urals in the 1930s

This article is devoted to the history of repression against the Russian Orthodox Church in the Urals in the 1930s. The main directions of political repression, are provided by Rotary milestones in their implementation. Characterized by the methods, extent and consequences of the repressive activities of the OGPU-NKVD

Analysis of correlation properties of Shack-Hartmann sensor measurements depending on the characteristics of the intensity distribution in the laser beam

The evolution of the turbulent distortion is a random process of the wavefront fluctuations, which can only assess the correlation method. The algorithm for computing of the cross wind transport turbulent distortion speed by the sensor measurement for laser beams propagating through the atmosphere is implemented on the basis of correlation analysis of the centroid coordinates. Correlation properties of sensor measurements are dependent on the characteristics of the intensity distribution in the beam. Studies of this dependence are based on numerical experiments

Numerical research of measurements of Shack-Hartmann wavefront sensor according to the parameters of its optical parts and the intensity of turbulent distortions

The wavefront sensor of Hartmann type consists of two parts: the optical and algorithmic. The parameters of the optical part of the sensor may vary. Since the time of “frozen” turbulence due to the Fried’s length and to the cross wind transport turbulent distortion speed, the measurement Shack-Hartmann sensor depend on the intensity of turbulent distortions. In this paper are presented the results of the analysis of the measurements of the sensor according to the size of lens array and to the intensity of turbulent distortions. The analysis is performed on basis of a numerical model of the Shack-Hartmann wavefront sensor and on Kolmogorov’s turbulence model

Adaptive correction of turbulent distortions by MEMS flexible mirror

In astronomy, there is a very important task - distortion correction. The problem is solved by an adaptive mirror with a variable geometry which can be created based on MEMS. The annex to the adaptive optics, MEMS is membrane mirror of small dimensions, but with a large number of controls. The action of external forces on the controls adjusts the mirror surface shape correction for distortion compensation. Force directed at one control element slightly affects the shape of the mirror surface in the areas where the remaining elements. It is shown that for each control of the mirror can be affected, which is proportional to the calculated value of the sensor by measuring the wavefront coming to the input aperture of the system