VLTI-UT vibrations effort and performances

Sébastien Poupar; Pierre Haguenauer; Jaime Alonso; Nicolas Schuhler; Juan-Pablo Henriquez; Jean-Philippe Berger; Pierre Bourget; Stephane Brillant; Roberto Castillo; Philippe Gitton; Frederic Gonte; Nicola Di Lieto; Jean-Louis Lizon; Antoine Merand; Julien Woillez

doi:10.1117/12.2055435

22 July 2014 VLTI-UT vibrations effort and performances

Sébastien Poupar, Pierre Haguenauer, Jaime Alonso, Nicolas Schuhler, Juan-Pablo Henriquez, Jean-Philippe Berger, Pierre Bourget, Stephane Brillant, Roberto Castillo, Philippe Gitton, Frederic Gonte, Nicola Di Lieto, Jean-Louis Lizon, Antoine Merand, Julien Woillez

Author Affiliations +

Proceedings Volume 9145, Ground-based and Airborne Telescopes V; 91452M (2014) https://doi.org/10.1117/12.2055435
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

The ESO Very Large Telescope Interferometer (VLTI) using the Unit Telescope (UT) was strongly affected by vibrations since the first observations. Investigation by ESO on that subject had started in 2007, with a considerable effort since mid 2008. An important number of investigations on various sub-systems (On telescope: Guiding, Passive supports, Train Coude, insulation of electronics cabinets; On Instruments: dedicated campaign on each instruments with a special attention on the ones equipped with Close Cycle Cooler) were realized. Vibrations were not only recorded and analyzed using the usual accelerometers but also using on use sub-systems as InfRared Image Sensor (IRIS) and Multiple Applications Curvature Adaptive Optics (MACAO) and using a specific tool developed for vibrations measurements Mirror vibrAtion Metrology systeM for the Unit Telescope (MAMMUT). Those tools and systems have been used in order to improve the knowledge on telescope by finding sources. The sources whenever it was possible were damped. As known for years, instruments are still the principal sources of vibrations, for the majority of the UT. A special test in which 2 UTs instruments were completely shut down was realized to determine the minimum Optical Path Length (OPL) achievable. Vibrations is now a part of the instruments interface document and during the installation of any new instrument (KMOS) or system (AOF) a test campaign is realized. As a result some modifications (damping of CCC) can be asked in case of non-compliance. To ensure good operational conditions, levels of vibrations are regularly recorded to control any environmental change.

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Sébastien Poupar, Pierre Haguenauer, Jaime Alonso, Nicolas Schuhler, Juan-Pablo Henriquez, Jean-Philippe Berger, Pierre Bourget, Stephane Brillant, Roberto Castillo, Philippe Gitton, Frederic Gonte, Nicola Di Lieto, Jean-Louis Lizon, Antoine Merand, and Julien Woillez "VLTI-UT vibrations effort and performances", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91452M (22 July 2014); https://doi.org/10.1117/12.2055435

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