Experience with wind-excited mirror vibrations

Hans Juergen Kaercher

doi:10.1117/12.566268

7 July 2004 Experience with wind-excited mirror vibrations

Hans Juergen Kaercher

Proceedings Volume 5382, Second Backaskog Workshop on Extremely Large Telescopes; (2004) https://doi.org/10.1117/12.566268
Event: Second Backaskog Workshop on Extremely Large Telescopes, 2003, Backaskog, Sweden

Abstract

For the performance of Extreme Large Telescopes the control of wind excited vibrations of the mirror segments may be an issue. There exits some experience with wind excitations of airborne telescopes. At the moment, the 2.7m airborne observatory SOFIA is under construction, where aircraft and aero-acoustic excitations are the design driver for the mirror supporting system. The planning and execution of the first test flights is coming up in the next 12 month. The paper explains the related vibration isolation and compensation features of SOFIA. The experience with the design and end-to-end simulation, the results of the on-ground tests, and the plans how to verify them in-flight, will be presented. This experience may give some hints for the design of the alignment systems for the mirror segments of Extreme Large Telescopes. The paper will present some ideas, comments and recommendations of the SOFIA system engineer for control systems of mirror segments.

Citation Download Citation

Hans Juergen Kaercher "Experience with wind-excited mirror vibrations", Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); https://doi.org/10.1117/12.566268

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