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Proceedings Paper

The deformable secondary mirror of VLT: final electro-mechanical and optical acceptance test results
Author(s): Runa Briguglio; Roberto Biasi; Marco Xompero; Armando Riccardi; Mario Andrighettoni; Dietrich Pescoller; Gerald Angerer; Daniele Gallieni; Elise Vernet; Johann Kolb; Robin Arsenault; Pierre-Yves Madec
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Paper Abstract

The Deformable Secondary Mirror (DSM) for the VLT ended the stand-alone electro-mechanical and optical acceptance process, entering the test phase as part of the Adaptive Optics Facility (AOF) at the ESO Headquarter (Garching). The VLT-DSM currently represents the most advanced already-built large-format deformable mirror with its 1170 voice-coil actuators and its internal metrology based on co-located capacitive sensors to control the shape of the 1.12m-diameter 2mm-thick convex shell. The present paper reports the final results of the electro-mechanical and optical characterization of the DSM executed in a collaborative effort by the DSM manufacturing companies (Microgate s.r.l. and A.D.S. International s.r.l.), INAF-Osservatorio Astrofisico di Arcetri and ESO. The electro-mechanical acceptance tests have been performed in the company premises and their main purpose was the dynamical characterization of the internal control loop response and the calibration of the system data that are needed for its optimization. The optical acceptance tests have been performed at ESO (Garching) using the ASSIST optical test facility. The main purpose of the tests are the characterization of the optical shell flattening residuals, the corresponding calibration of flattening commands, the optical calibration of the capacitive sensors and the optical calibration of the mirror influence functions.

Paper Details

Date Published: 21 July 2014
PDF: 8 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 914845 (21 July 2014); doi: 10.1117/12.2057591
Show Author Affiliations
Runa Briguglio, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Roberto Biasi, Microgate S.r.l. (Italy)
Marco Xompero, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Armando Riccardi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Mario Andrighettoni, Microgate S.r.l. (Italy)
Dietrich Pescoller, Microgate S.r.l. (Italy)
Gerald Angerer, Microgate S.r.l. (Italy)
Daniele Gallieni, A.D.S. International S.r.l. (Italy)
Elise Vernet, European Southern Observatory (Germany)
Johann Kolb, European Southern Observatory (Germany)
Robin Arsenault, European Southern Observatory (Germany)
Pierre-Yves Madec, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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