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Proceedings Paper

PERSEE, the dynamic nulling demonstrator: recent progress on the cophasing system
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Paper Abstract

Spectral characterization of exo-planets can be made by nulling interferometers. In this context, several projects have been proposed such as DARWIN, FKSI, PEGASE and TPF, space-based, and ALADDIN, ground-based. To stabilize the beams with the required nanometric accuracy, a cophasing system is required, made of piston/tip/tilt actuators on each arm and piston/tip-tilt sensors. The demonstration of the feasibility of such a cophasing system is a central issue. In this goal, a laboratory breadboard named PERSEE is under integration. Main goals of PERSEE are the demonstration of a polychromatic null from 1.65 μm to 3.3 μm with a 10-4 rejection rate and a 10-5 stability despite the introduction of realistic perturbations, the study of the interfaces with formation-flying spacecrafts and the joint operation of the cophasing system with the nuller. We describe the principle of the cophasing system made by Onera, operating in the [0.8 - 1] μm (tip/tilt) and [0.8 - 1.5] μm (piston) spectral bands. Emphasis is put on the piston sensor and its close integration with the nuller.

Paper Details

Date Published: 28 July 2008
PDF: 9 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70131W (28 July 2008); doi: 10.1117/12.789113
Show Author Affiliations
K. Houairi, Office National d'Etudes et de Recherche Aérospatiales (France)
Ctr. National d'Études Spatiales (France)
PHASE, ONERA, Observatoire de Paris, CNRS, and Univ. Denis Diderot Paris 7 (France)
F. Cassaing, Office National d'Etudes et de Recherche Aérospatiales (France)
PHASE, ONERA, Observatoire de Paris, CNRS, and Univ. Denis Diderot Paris 7 (France)
J. M. Le Duigou, Ctr. National d'Études Spatiales (France)
B. Sorrente, Office National d'Etudes et de Recherche Aérospatiales (France)
PHASE, ONERA, Observatoire de Paris, CNRS, and Univ. Denis Diderot Paris 7 (France)
S. Jacquinod, Institut d'Astrophysique Spatiale, Ctr. Univ. d'Orsay (France)
J. P. Amans, GEPI, Observatoire de Paris (France)
PHASE, ONERA, Observatoire de Paris, CNRS, and Univ. Denis Diderot Paris 7 (France)


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

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