Physics – Optics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.354..213l&link_type=abstract
In ESA, Targets for Space-Based Interferometry p 213-217 (SEE N93-31750 12-89)
Physics
Optics
Adaptive Optics, Astronomical Interferometry, Interferometers, Space Observations (From Earth), Wave Front Reconstruction, Atmospheric Turbulence, Data Acquisition, Imaging Techniques, Sensitivity, Signal To Noise Ratios, Wave Front Deformation
Scientific paper
Turbulence induced decorrelation of wavefronts received from distant astronomical sources severely limits the signal to noise ratio of the estimates of fringe visibility obtainable using uncompensated optical interferometers located on the surface of the Earth. Adaptive optics systems can be used to concentrate light in the fringe patterns with the consequence of improving the sensitivity and general utility of interferometric data acquisition. Calculations which predict the improvement(s) in detection sensitivity expressed in limiting detectable visual magnitude for a stellar interferometer equipped with a wavefront compensation system capable of widely varying degrees of spatial compensation are presented. Significant performance gains are shown to result from even modest levels of wavefront correction. Sensitivity enhancements associated with more complete correction may prove unattainable in practice with all but the brightest sources due to insufficient signal to noise in the wavefront sensor.
Fender Janet S.
Loos Gary C.
Otten Leonard J. III
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