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20 October 2004 IRIS: an infrared tilt sensor for the VLTI
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In the last two years the Very Large Telescope Interferometer (VLTI) has been operated with a wavefront controlled down to the Coude focus of each 8m Unit Telescope. From this focus, the stellar beam is passively relayed by more than 10 mirrors distributed along a 100m subterranean path before to be coherently superimposed in the VLTI laboratory. Experience has proven that the observation efficiency would be largely improved by controlling the tilt of the beam directly inside the VLTI laboratory. In this article, we present the justification and basic features of the InfraRed Image Sensor (IRIS) as well as its implementation within the already packed VLTI laboratory. The forthcoming milestones of the project are presented.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Philippe B. Gitton, Samuel A. Leveque, Gerardo Avila, and Thanh Phan Duc "IRIS: an infrared tilt sensor for the VLTI", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004);


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