Vol. 30, issue 11, article # 13

Abstract:

Wavefront aberrations at the input aperture of the Large Solar Vacuum Telescope were measured by a wavefront sensor of the adaptive optics system by a sunspot. To calculate the image displacement, a correlation algorithm with quadratic interpolation of the correlation function maximum position was used. The quality of astronomical vision, characterized by the Fried radius, was estimated from the same experimental data as the statistical characteristics of the fluctuations of the coefficients of the wavefront aberrations’ expansion in Zernike polynomials. The results were obtained at a Fried radius of 51.6 mm, in a sample 43 s long, with a sampling frequency of 70 Hz. The means and standard deviations of the expansion coefficients were calculated. The analysis of the given spectra implies that the wavefront aberrations should be compensated in the frequency band 0–20 Hz for the effective correction of the images formed.

Keywords:

turbulence, phase distortions, wavefront sensor, mode analysis, Sun image

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