A method to obtain an estimate of Fried’s seeing parameter r0 from time series of an arbitrarily shaped, resolved structure that exhibits degradation resulting from atmospheric turbulence is presented. The basic idea is to evaluate the ratio of the observed squared modulus of the average Fourier transform and the observed average power spectrum. The theory of the method is developed, and the influence of noise on the ratio is discussed. The method has been applied to five consecutive time series of observations of solar granulation under different seeing conditions. The power spectra, which are reconstructed with appropriate theoretical modulation transfer functions, converge.
© 1984 Optical Society of America
Original Manuscript: September 6, 1983
Manuscript Accepted: January 16, 1984
Published: May 1, 1984
O. von der Lühe, "Estimating Fried’s parameter from a time series of an arbitrary resolved object imaged through atmospheric turbulence," J. Opt. Soc. Am. A 1, 510-519 (1984)