Self-Tuning Mechanism for the Design of Adaptive Secondary Mirror Position Control

Battistelli, G., Mari, D., Riccardi, A. & Tesi, P., 28-Feb-2015, In : IEEE Transactions on Control Systems Technology. 23, 6, p. 2087-2100 14 p.

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  • Self-Tuning Mechanism for the Design of Adaptive Secondary Mirror Position

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  • Giorgio Battistelli
  • Daniele Mari
  • Armando Riccardi
  • Pietro Tesi
Deformable mirrors (DMs) are electromechanical devices used in ground-based telescopes to compensate for the distortions caused by the atmospheric turbulence, the main factor limiting the resolution of astronomical imaging. Adaptive secondary mirrors (ASMs) represent a new type of DMs; two of them have been recently installed on the 8-m-class large binocular telescope (LBT). ASMs are able to jointly correct rigid and nonrigid wave-front distortions thanks to the use of force actuators distributed on the overall mirror surface. As an offset, each actuator needs to be piloted by a dedicated controller, whose parameters must be accurately tuned to obtain the desired mirror shape. At the present time, the calibration of the controller parameters is executed manually. This paper presents a novel automatic controller tuning procedure that does not rely on the modeling of the mirror dynamics. The experimental validation on a prototype reproducing the three innermost rings of the LBT ASM is reported.
Original languageEnglish
Pages (from-to)2087-2100
Number of pages14
JournalIEEE Transactions on Control Systems Technology
Issue number6
Publication statusPublished - 28-Feb-2015

ID: 19403065