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Basic and future concepts of interferometers, including the confusion e ect

Summary: Basic and future concepts of interferometers,
including the confusion e ect
P. Riaud 1, S. Clade 2, O. Absil 1, L. Arnold 3
Institut d'Astrophysique et de Geophysique, Universite de Liege, Belgique
Service d'Aeronomie du CNRS, Verriere le Buisson, France
Observatoire de Haute-Provence, France
Abstract: In this paper, we discuss the di erent recombination techniques in stellar interferometry
and their implications in imaging reconstruction. Actually, three techniques exist for imaging inter-
ferometers : Fizeau, Densi ed and IRAN, each with di erent interests. Because of an incomplete
frequency coverage in the (u,v) plane, all interferometers give a poor image quality with multiple
bright peaks in direct imaging. This e ect decreases the detectivity of faint sources due to the crowd-
ing e ect. The aim of this article is to investigate this confusion problem in the both cases of a single
pupil and of an interferometric array. Confusion noise is the crowding e ect between the di erent
sources present in the eld of view of the instrument. This e ect becomes important when the instru-
ment has a large collecting surface and a weak quality for its Point Spread Function. This study gives
an estimation of detectivity loss due to confusion noise with the di erent optical instruments.
1 Introduction


Source: Arnold, Luc - Observatoire de Haute-Provence


Collections: Physics