Transferring an Earth-based Adaptive Optics Technology to Space Telescopes

Aerotecnica Missili & Spazio

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Title Transferring an Earth-based Adaptive Optics Technology to Space Telescopes
Creator Dozio, Lorenzo
Mantegazza, Paolo
Bevilacqua, Marco
Subject Structural Dynamics; Control Theory and Technology; Space Systems
Large aperture space telescopes; Contactless voice-coil actuation; Voltage-driven voice coils; Shape control; Damping augmentation; Optimal output feedback control

Description The present work is aimed at studying the application of a contactlessvoice-coil actuation technology, currently developed for some new-generationearth telescopes, to an hypothetical secondary mirror of a space telescopesubjected to nanometric precision requirements.The technology involves a large number of electromagnetic actuatorswhich are not in contact with the optical mirror.Each actuator is made by a fixed coil wound on a cold finger and a moving magnet,glued to the rear surface of the thin adaptive mirror.A stiff backplate provides the position reference.The gap between the mirror and the backplate is measuredthrough co-located capacitive sensors.Since future space telescopes will operate at cryogenics temperatures,where the material damping is extremely small, the design of high-performanceand stable active shape controllers without detrimental spillover effects is challenging.Due to the impossibility to exploit aerodynamic damping arisingfrom the squeezed air film between the mirror and the backplate,as done on earth-based mirrors, there is the need of finding an alternativeto damp out vibrations.For this purpose, the current-driven technology implemented in earth-basedapplications is replaced by a voltage-driven solution, which provides dampingaugmentation by means of eddy currents.This is crucial in achieving a sufficiently stable dynamic response.The related limitation in the control bandwidth is fully compatiblewith the promptness requirements of the control system for the application under study.
Publisher Associazione Italiana di Aeronautica e Astronautica (AIDAA)
Date 2017-12-29
Type info:eu-repo/semantics/article
Peer-reviewed Article
Numerical; Simulation
Format application/pdf
Source Aerotecnica Missili & Spazio; Vol 96, No 3 (2017); 124-135
Language eng
Rights Copyright (c) 2017 Aerotecnica Missili & Spazio

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