Persee

Participants

Vincent Coude du Foresto — 2012-12-07T10:43:49Z

La liste des participants se trouve ici. - Atelier prospective

Programme

Vincent Coude du Foresto — 2012-12-07T10:08:33Z

Le programme indicatif de la journée est le suivant : 10h30 : accueil, café 11h00 : Introduction, rappel historique et motivations du banc PERSEE (V. Coudé du Foresto, 10'+5' discussion) Présentation générale du banc, bilan des performances et résultats obtenus (E. Lhomé, 45'+10') 12h10 : déjeuner (à l'extérieur) 13h40 : Etat des lieux : Statut sur le contexte de l'interférométrie annulante (missions ou projets à l'étude) en France / Europe (M. Ollivier, 10'+5') Statut sur le contexte de (...) - Atelier prospective

Accueil

Vincent Coude du Foresto — 2012-12-06T21:20:39Z

Bienvenue sur le site Web dédié au banc PERSEE d'interférométrie annulante, un projet lancé par le CNES en 2006 dans la perspective des missions DARWIN, PEGASE, FKSI etc., et implique le LESIA, l'ONERA, et l'OCA. Le banc est intégré et pleinement opérationnel en salle blanche, où il a permis de démontrer des taux d'annulation polychromatiques meilleurs que 10-5 et stabilisés à 10-6 sur quelques heures. Vous y trouverez sur ce site : Les articles publiés sur le banc PERSEE Les thèses effectuées sur le (...) - Page d'accueil

Final results of the PERSEE experiment [2012]

emilie lhome — 2012-12-05T15:44:13Z

Abstract : The PERSEE breadboard, developed by a consortium including CNES, IAS, LESIA, OCA, ONERA and TAS since 2005, is a nulling demonstrator that couples an infrared nulling interferometer with a formation flying simulator able to introduce realistic disturbances in the set-up. The general idea is to prove that an adequate optical design can considerably relax the constraints applying at the spacecrafts level of a future interferometric space mission like Darwin/TPF or one of its (...) - ARTICLES

Design of a star, planet and exo-zodiacal cloud simulator for the nulling testbench PERSEE [2011]

emilie lhome — 2012-12-05T15:42:45Z

Abstract : On-going developments on the PERSEE nulling testbench include the realization of a focal plane simulator featuring one central star, an extra-solar planet orbiting around it, and an Exo-Zodiacal Cloud (EZC) surrounding the observed stellar system. PERSEE (Pégase Experiment for Research and Stabilization of Extreme Extinction) is a laboratory testbench jointly developed by a Consortium of six French institutes and companies, incorporating Observatoire de la Côte d'Azur (OCA) who is (...) - ARTICLES

Current results of the PERSEE testbench : the cophasing control and the polychromatic null rate [2011]

emilie lhome — 2012-12-05T15:42:01Z

Abstract : Stabilizing a nulling interferometer at a nanometric level is the key issue to obtain deep null depths. The PERSEE breadboard has been designed to study and optimize the operation of a cophased nulling bench in the most realistic disturbing environment of a space mission. This presentation focuses on the current results of the PERSEE bench. In terms of metrology, we cophased at 0.33 nm rms for the piston and 80 mas rms for the tip/tilt (0.14% of the Airy disk). A Linear Quadratic (...) - ARTICLES

PERSEE : Experimental results on the cophased nulling bench [2010]

emilie lhome — 2012-12-05T15:40:56Z

Abstract : Nulling interferometry is still a promising method to characterize spectra of exoplanets. One of the main issues is to cophase at a nanometric level each arm despite satellite disturbances. The bench PERSEE aims to prove the feasibility of that technique for spaceborne missions. After a short description of PERSEE, we will first present the results obtained in a simplified configuration : we have cophased down to 0.22 nm rms in optical path difference (OPD) and 60 mas rms in (...) - ARTICLES

Review of OCA activities on nulling testbench PERSEE [2010]

emilie lhome — 2012-12-05T15:40:02Z

Abstract : We present a review of our activities on PERSEE (Pégase Experiment for Research and Stabilization of Extreme Extinction) at Observatoire de la Côte d'Azur (OCA). PERSEE is a laboratory testbench aiming at achieving a stabilized nulling ratio better than 10-4 in the astronomical bands K and M, in presence of flight-representative spacecraft perturbations. The bench has been jointly developed by a Consortium of six French institutes and companies, among which OCA was responsible for (...) - ARTICLES

PERSEE : description of a new concept for nulling interferometry recombination and OPD measurement [2008]

emilie lhome — 2012-12-05T15:39:11Z

Abstract : Nulling interferometry requires, among other things, a symmetric recombination module and an optical path difference control system. The symmetric recombination stage has been particularly studied over the last ten years and several concepts are now well known. One of them is the “Modified Mach Zehnder” (MMZ) interferometer, proposed by Serabyn and Colavita (2001) [1]. In this paper, we describe a new version of the MMZ beam combiner which provides a deep null signal in the science (...) - ARTICLES

PERSEE, the dynamic nulling demonstrator : Recent progress on the cophasing system [2008]

emilie lhome — 2012-12-05T15:38:12Z

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 (...) - ARTICLES