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Proceedings Paper

Fringe tracking and spatial filtering: phase jumps and dropouts
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Paper 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.

Paper Details

Date Published: 28 July 2008
PDF: 9 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70131D (28 July 2008); doi: 10.1117/12.789869
Show Author Affiliations
David F. Buscher, Cavendish Lab., Univ. of Cambridge (United Kingdom)
John S. Young, Cavendish Lab., Univ. of Cambridge (United Kingdom)
Fabien Baron, Cavendish Lab., Univ. of Cambridge (United Kingdom)
Christopher A. Haniff, Cavendish Lab., Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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