Share Email Print
cover

Proceedings Paper

Active damping of the SOFIA Telescope assembly
Author(s): Paul J. Keas; Edward Dunham; Ulrich Lampater; Enrico Pfüller; Stefan Teufel; Hans-Peter Roeser; Manuel Wiedemann; Jürgen Wolf
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The NASA/DLR Stratospheric Observatory for Infrared Astronomy (SOFIA) employs a 2.5-meter reflector telescope in a Boeing 747SP. The telescope is housed in an open cavity and is subjected to aeroacoustic and inertial disturbances in flight. To meet pointing requirements, SOFIA must achieve a pointing stability of approximately 0.5 arcseconds RMS. An active damping control system is being developed for SOFIA to reduce image jitter and image degradation due to resonance of the telescope assembly. Our paper discusses the history of the active damping design for SOFIA, from early concepts to the current implementation which has recently completed a ground and flight testing for proof-of-concept. We describe some milestones in the analysis and testing of the telescope assembly which guided the development of the vibration control system. The control synthesis approach and current implementation of the active damping control system is presented. Finally, we summarize the performance observed in early flight tests and the steps that are currently foreseen to completing the development of this system.

Paper Details

Date Published: 27 September 2012
PDF: 15 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844411 (27 September 2012); doi: 10.1117/12.924791
Show Author Affiliations
Paul J. Keas, Moog-CSA Engineering (United States)
Edward Dunham, Lowell Observatory (United States)
Ulrich Lampater, Deutsches SOFIA Institut (United States)
Univ. Stuttgart (Germany)
Enrico Pfüller, SOFIA Science Ctr., NASA Ames Research Ctr. (United States)
Univ. of Stuttgart (Germany)
Stefan Teufel, Deutsches SOFIA Institut (United States)
Univ. Stuttgart (Germany)
Hans-Peter Roeser, Univ. of Stuttgart (Germany)
Manuel Wiedemann, SOFIA Science Ctr., NASA Ames Research Ctr. (United States)
Univ. of Stuttgart (Germany)
Jürgen Wolf, SOFIA Science Ctr., NASA Ames Research Ctr. (United States)
Univ. of Stuttgart (Germany)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

© SPIE. Terms of Use
Back to Top