Fringe tracking and spatial filtering: phase jumps and dropouts

David F. Buscher; John S. Young; Fabien Baron; Christopher A. Haniff

doi:10.1117/12.789869

28 July 2008 Fringe tracking and spatial filtering: phase jumps and dropouts

David F. Buscher, John S. Young, Fabien Baron, Christopher A. Haniff

Proceedings Volume 7013, Optical and Infrared Interferometry; 70131D (2008) https://doi.org/10.1117/12.789869
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

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.

Citation Download Citation

David F. Buscher, John S. Young, Fabien Baron, and Christopher A. Haniff "Fringe tracking and spatial filtering: phase jumps and dropouts", Proc. SPIE 7013, Optical and Infrared Interferometry, 70131D (28 July 2008); https://doi.org/10.1117/12.789869

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