Share Email Print
cover

Proceedings Paper

Optimal a posteriori fringe tracking in optical interferometry
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The so-called “phase delay tracking” attempts to estimate the effects of the turbulence on the phase of the interferograms in order to numerically cophase the measured complex visibilities and to coherently integrate them. This is implemented by the “coherent fringe analysis” of MIDI instrument1 but has only been used for high SNR data. In this paper, we investigate whether the sensitivity of this technique can be pushed to its theoretical limits and thus applied to fainter sources. In the general framework of the maximum likelihood and exploiting the chromatic behavior of the turbulence effects, we propose a global optimization strategy to compute various estimators of the differential pistons between two data frames. The most efficient estimators appear to be the ones based on the phasors, even though they do not yet reach the theoretical limits.

Paper Details

Date Published: 24 July 2014
PDF: 14 pages
Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91462Y (24 July 2014); doi: 10.1117/12.2056590
Show Author Affiliations
Ferréol Soulez, Ctr. de Recherche Astronomique de Lyon, CNRS, Observatoire de Lyon (France)
Lab. Hubert Curien, CNRS, Univ. Jean Monnet (France)
Éric Thiebaut, Ctr. de Recherche Astronomique de Lyon, CNRS, Observatoire de Lyon (France)
Lab. Hubert Curien, CNRS, Univ. Jean Monnet (France)
Michel Tallon, Ctr. de Recherche Astronomique de Lyon, CNRS, Observatoire de Lyon (France)
Lab. Hubert Curien, CNRS, Univ. Jean Monnet (France)
Isabelle Tallon-Bosc, Ctr. de Recherche Astronomique de Lyon, CNRS, Observatoire de Lyon (France)
Lab. Hubert Curien, CNRS, Univ. Jean Monnet (France)
Paulo Garcia, Univ. do Porto (Portugal)


Published in SPIE Proceedings Vol. 9146:
Optical and Infrared Interferometry IV
Jayadev K. Rajagopal; Michelle J. Creech-Eakman; Fabien Malbet, Editor(s)

© SPIE. Terms of Use
Back to Top