Physics – Optics
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976optco..19...57a&link_type=abstract
Optics Communications, vol. 19, Oct. 1976, p. 57-60.
Physics
Optics
3
Atmospheric Turbulence, Imaging Techniques, Michelson Interferometers, Redundant Components, Signal To Noise Ratios, Telescopes, Turbulence Effects, Apertures, Arrays, Diffraction Patterns, Optical Transfer Function, Perturbation Theory, Power Spectra, Speckle Patterns, Wave Fronts
Scientific paper
Roddier (1974) showed that the theory of speckle interferometry applies to Michelson stellar interferometry and aperture synthesis in the case of small multiple apertures. His results are generalized to an array of N telescopes with large apertures. In this case, the power spectrum of synthetic short-exposure images shows peaks at certain discrete frequencies. Consideration is given to the ratio of the energy of the peak at one such frequency to the total low-frequency energy of long-exposure images. It is found that this ratio is independent of seeing conditions whenever the wavefront perturbations on each aperture are uncorrelated. An attenuation factor equal to the inverse of the redundancy of the telescope array at a given frequency is obtained which provides a quantitative expression for the pupil redundancy effect. It is concluded that the S/N ratio will be proportional to the redundancy of the array.
Aime Claude
Roddier Francois
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