Speckle interferometry. I - Principles

Statistics – Applications

Scientific paper

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Atmospheric Turbulence, Image Resolution, Interferometry, Speckle Patterns, Telescopes, Diffraction Patterns, Focal Plane Devices, Fourier Transformation, Image Converters, Laser Applications

Scientific paper

Turbulence effects in the atmosphere of the earth make it impossible to obtain with large ground-based telescopes images with a resolution which correspond to the theoretical resolving power of the instrument. A description is presented of the characteristics of speckle images which contain structures that have been produced as a consequence of interference phenomena in the focal plane. The interference effects are related to the atmospheric turbulence. Speckle images of good quality can be obtained with the aid of electronic image converters, interference filters, and brief exposure times. Labeyrie (1970) has developed a special laboratory procedure which makes it possible to obtain on the basis of the speckle images object information which corresponds to the theoretical resolving power of the employed telescope. Labeyrie's procedure is described and a simple mathematical representation of speckle interferometry is discussed.

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