28 July 2008 The ESPRI Project: differential delay lines for PRIMA
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Abstract
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-arcseconds 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 cat's 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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. Pepe, F. Pepe, D. Queloz, D. Queloz, Th. Henning, Th. Henning, A. Quirrenbach, A. Quirrenbach, F. Delplancke, F. Delplancke, L. Andolfato, L. Andolfato, H. Baumeister, H. Baumeister, P. Bizenberger, P. Bizenberger, H. Bleuler, H. Bleuler, B. Chazelas, B. Chazelas, F. Dérie, F. Dérie, L. Di Lieto, L. Di Lieto, T. P. Duc, T. P. Duc, O. Duvanel, O. Duvanel, M. Fleury, M. Fleury, D. Gillet, D. Gillet, U. Graser, U. Graser, F. Koch, F. Koch, R. Launhardt, R. Launhardt, C. Maire, C. Maire, D. Mégevand, D. Mégevand, Y. Michellod, Y. Michellod, J.-M. Moresmau, J.-M. Moresmau, P. Müllhaupt, P. Müllhaupt, V. Naranjo, V. Naranjo, L. Sache, L. Sache, Y. Salvadé, Y. Salvadé, G. Simond, G. Simond, D. Sosnowska, D. Sosnowska, K. Wagner, K. Wagner, L. Zago, L. Zago, } "The ESPRI Project: differential delay lines for PRIMA", Proc. SPIE 7013, Optical and Infrared Interferometry, 70130P (28 July 2008); doi: 10.1117/12.788169; https://doi.org/10.1117/12.788169
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