Fringe tracking and spatial filtering: phase jumps and dropouts

Details Fringe tracking and spatial filtering: phase jumps and dropouts Fringe tracking and spatial filtering: phase jumps and dropouts

2008-07-12

arxiv.org/abs/0807.2001v1

Astronomy and Astrophysics

Astrophysics

9 pages, to be published in Proc. SPIE conference 7013 "Optical and Infrared Interferometry", Schoeller, Danchi, and Delplanck

Scientific paper

10.1117/12.789869

Fringe tracking in interferometers is typically analyzed with the implicit assumption that there is a single phase associated with each telescope in the array. If the telescopes have apertures significantly larger than r0 and only partial adaptive optics correction, then the phase measured by a fringe sensor may differ significantly from the "piston" component of the aperture phase. In some cases, speckle noise will cause "branch points" in the measured phase as a function of time, causing large and sudden jumps in the phase. We present simulations showing these effects in order to understand their implications for the design of fringe tracking algorithms.

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