Optimal a posteriori fringe tracking in optical interferometry

• Type: Article in International Conference Proceedings Book
• Date: 2014

Authors

Soulez, F (Author) Other; Thiebaut, E (Author) Other; Tallon, M (Author) Other; Tallon Bosc, I (Author) Other; P. J. V. Garcia (Author) FEUP

Conference proceedings International

Title: OPTICAL AND INFRARED INTERFEROMETRY IV

Conference on Optical and Infrared Interferometry IV

Montreal, CANADA, JUN 23-27, 2014

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 2 Citations

Other information

Authenticus ID: P-00A-66J

DOI: 10.1117/12.2056590

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14