21 July 2014 The deformable secondary mirror of VLT: final electro-mechanical and optical acceptance test results
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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.
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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, "The deformable secondary mirror of VLT: final electro-mechanical and optical acceptance test results", Proc. SPIE 9148, Adaptive Optics Systems IV, 914845 (21 July 2014); doi: 10.1117/12.2057591; https://doi.org/10.1117/12.2057591
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