Estimating Fried's parameter from a time series of an arbitrary resolved object imaged through atmospheric turbulence.
Abstract
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.
- Publication:
-
Journal of the Optical Society of America A
- Pub Date:
- May 1984
- DOI:
- 10.1364/JOSAA.1.000510
- Bibcode:
- 1984JOSAA...1..510V
- Keywords:
-
- Atmospheric Turbulence;
- Image Analysis;
- Parameter Identification;
- Solar Granulation;
- Time Series Analysis;
- Turbulence Effects;
- Fourier Transformation;
- Image Reconstruction;
- Image Resolution;
- Modulation Transfer Function;
- Noise Reduction;
- Power Spectra;
- Astronomy;
- Earth Atmosphere:Seeing;
- Seeing:Earth Atmosphere