Shearing stellar interferometer. 1: Digital dataanalysis scheme

Erez Ribak, Elia Leibowitz

Research output: Contribution to journalArticlepeer-review


A method to extract the visibility of celestial objects in real time using a parallel-shear interferometer is described. Such an instrument produces fringes of constant visibility but with random atmospheric-induced phases. The fringes are modulated internally, and synchronuous detection with many parallel channels recovers their contrast. First, we perform parallel sine and cosine phase-locked accumulation for the short period in which the atmosphere is presumed frozen. The visibility amplitude is then calculated allowing for Poisson noise. We find that a 7.8mstar can be resolved by a single detector to the diffraction limit of the telescope; with twenty such detectors, the limit is 10m.

Original languageEnglish
Pages (from-to)3088-3093
Number of pages6
JournalApplied Optics
Issue number18
StatePublished - 15 Sep 1985


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