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Proceedings Paper

Lightweight active controlled primary mirror technology demonstrator
Author(s): P. Mazzinghi; V. Bratina; D. Ferruzzi; L. Gambicorti; F. Simonetti; A. Zuccaro Marchi; P. Salinari; F. Lisi; M. Olivier; A. Bursi; D. Gallieni; R. Biasi; J. Pereira
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Paper Abstract

This paper describes the design, manufacturing and test of a ground demonstrator of an innovative technology able to realize lightweight active controlled space-borne telescope mirror. This analysis is particularly devoted to applications for a large aperture space telescope for advanced LIDAR, but it can be used for any lightweight mirror. For a space-borne telescope the mirror weight is a fundamental parameter to be minimized (less than 15 Kg/m2), while maximizing the optical performances (optical quality better than &lgr;/3). In order to guarantee these results, the best selected solution is a thin glass primary mirror coupled to a stiff CFRP (Carbon Fiber Reinforced Plastic) panel with a surface active control system. A preliminary design of this lightweight structure highlighted the critical areas that were deeply analyzed by the ground demonstrator: the 1 mm thick mirror survivability on launch and the actuator functional performances with low power consumption. To preserve the mirror glass the Electrostatic Locking technique was developed and is here described. The active optics technique, already widely used for ground based telescopes, consists of a metrology system (wave front sensor, WFS), a control algorithm and a system of actuators to slightly deform the primary mirror and/or displace the secondary, in a closed-loop control system that applies the computed corrections to the mirror's optical errors via actuators. These actuators types are properly designed and tested in order to guarantee satisfactory performances in terms of stroke, force and power consumption. The realized and tested ground demonstrator is a square CFRP structure with a flat mirror on the upper face and an active actuator beneath it. The test campaign demonstrated the technology feasibility and robustness, supporting the next step toward the large and flat surface with several actuators.

Paper Details

Date Published: 3 October 2007
PDF: 10 pages
Proc. SPIE 6750, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing III, 67500Y (3 October 2007); doi: 10.1117/12.737839
Show Author Affiliations
P. Mazzinghi, National Institute of Applied Optics of Italian National Research Council (Italy)
V. Bratina, National Institute of Applied Optics of Italian National Research Council (Italy)
D. Ferruzzi, National Institute of Applied Optics of Italian National Research Council (Italy)
L. Gambicorti, National Institute of Applied Optics of Italian National Research Council (Italy)
F. Simonetti, National Institute of Applied Optics of Italian National Research Council (Italy)
A. Zuccaro Marchi, National Institute of Applied Optics of Italian National Research Council (Italy)
P. Salinari, INAF, Arcetri Astrophysics Observatory (Italy)
F. Lisi, INAF, Arcetri Astrophysics Observatory (Italy)
M. Olivier, Carlo Gavazzi Space (Italy)
A. Bursi, Carlo Gavazzi Space (Italy)
D. Gallieni, ADS International (Italy)
R. Biasi, Microgate (Italy)
J. Pereira, European Space Agency (Netherlands)


Published in SPIE Proceedings Vol. 6750:
Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing III
Upendra N. Singh; Gelsomina Pappalardo, Editor(s)

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