UT1 Passes ``With Honour'' the First Severe Stability tests for VLTI

Details UT1 Passes ``With Honour'' the First Severe Stability tests for VLTI UT1 Passes ``With Honour'' the First Severe Stability tests for VLTI

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998msngr..93q..11k&link_type=abstract

The Messenger, vol. 93, p. 11-12

Physics

Scientific paper

Over the past years, a significant effort has been put in verifying and improving the capability of the VLT Unit Telescope (UT) to reach the very demanding Optical Path Length (OPL) stability at the nanometer level, as required by the VLT Interferometer (VLTI). Up to now, this has been done primarily by analysis using detailed Finite Element Models with inputs from dedicated measurement campaigns such as the characterisation of micro-seismic activity at Paranal [1], [2], vibration tests on IR instruments closed-cycle coolers and pumps [3], as well as tests at subsystem level on the M2 unit, on the enclosure, on the telescope structure equipped with dummy mirrors, etc. [4].

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