| Autor: |
D. Sosnowska, B. Chazelas, Hannes Bleuler, M. Fleury, Ralf Launhardt, Franz Koch, Thanh Phan Duc, Karl Wagner, Denis Mégevand, A. Quirrenbach, Y. Salvadé, L. Sache, Lorenzo Zago, Frederic Derie, P. Müllhaupt, C. Maire, Peter Bizenberger, Th. Henning, Denis Gillet, J. M. Moresmau, Gilles Simond, Uwe Graser, L. Di Lieto, Francoise Delplancke, Vianak Naranjo, Harald Baumeister, O. Duvanel, Francesco Pepe, Didier Queloz, Y. Michellod, Luigi Andolfato |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
SPIE Proceedings. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.788169 |
| Popis: |
ESPRI is a project which aims at searching for and characterizing extra-solar planets by dual-beam astrometry with PRIMA@VLTI. Differential Delay Lines (DDL) are fundamental for achieving the micro-ar cseconds accuracy required by the scientific objective. Our Consortium, consisting of the Geneva Observatory, the Max-Planck Institut for Astronomy Heidelberg, and the Landessternwarte Heidelberg, in collaboration with ESO, has built and tested these DDLs successfully and will install them in summer 2008 at the VLTI. These DDLs consist of high quality cats eyes displaced on a parallel beam-mechanics and by means of a two-stage actuation with a precision of 5 nm over a stroke length of 70 mm. Over the full range, a bandwidth of about 400 Hz is achieved. The DDLs are operated in vacuum. We shall present, in this paper, their design and their exceptional performances. Keywords: Interferometry, near infrared, astrom etry, extrasolar planets, delay lines *Francesco.Pepe@obs.unige.ch |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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