Experimental estimation of the spatial-coherence outer scale from a wavefront statistical analysis

Details Experimental estimation of the spatial-coherence outer scale from a wavefront statistical analysis Experimental estimation of the spatial-coherence outer scale from a wavefront statistical analysis

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282.1021z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. 1021-1033

Astronomy and Astrophysics

Astrophysics

17

Astronomical Interferometry, Astronomical Photography, Atmospheric Effects, Atmospheric Models, Atmospheric Turbulence, Covariance, Image Processing, Wave Fronts, Angular Resolution, Experiment Design, High Resolution, Image Motion Compensation, Image Resolution, Power Spectra, Telescopes, Turbulence Models

Scientific paper

Estimations of the spatial-coherence outer scale L0 relevant for high angular resolution imaging are deduced from measurements of both-angle-of-arrival normalized covariance and difference of the variances measured with two different size circular apertures. These measurements have been obtained by means of an experimental device identical to a differential image motion monitor. Simultaneous estimations of Fried's parameter r0 are obtained from this difference and compared to those deduced from the structure function European Southern Observatory's ((ESO's) Differential Image Motion Monitor (DIMM) method). The sensitivity of these techniques to the different noises as well as to the model describing atmospheric turbulence, is deeply analyzed and discussed. The effect of a finite outer scale on the temporal power spectrum is also studied in the case of three different models. The values obtained for L0 appear to be in good agreement those presented in literature. The main conclusion of this work is that this parameter varies widely in time (and probably in space) and that a monitor dedicated to its measurement becomes a necessity.

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