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A Finite Element Approach to the Design of the Support System for the ESO 1 M. Active Optics Experiment

Published online by Cambridge University Press:  12 April 2016

G. Ballio ,
R. Contro ,
C. Poggi  and
O. Citterio
G. Ballio
Affiliation:
Dipartimento di Ingegneria Strutturale del, Politecnico di Milano
R. Contro
Affiliation:
Dipartimento di Ingegneria Strutturale del, Politecnico di Milano
C. Poggi
Affiliation:
Dipartimento di Ingegneria Strutturale del, Politecnico di Milano
O. Citterio
Affiliation:
Istituto di Fisica Cosmica del C.N.R. - Milano

Extract

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A way to follow in order to reduce the weight of the primary mirror is to accept an higher ratio diameter-thickness and to find a remedy to the consequent greater deformability of the mirror by an active control system of it. A technique using closed loop active optics control has been proposed in references.

In these papers, a coherent scheme of active optics control for the ESO New Technology Telescope (NTT) was presented, based on analysis of the image errors in terms of an appropriate polynomial (the ESO off-line telescope test polynomial) and the production of equivalent correction terms by force modulation of the primary axial support.

References

|1| Wilson, R.N.: “Image quality considerations in ESO telescope projects” Optica Acta, 1982, Vol. 29 No. 7, 985–992.CrossRefGoogle Scholar
|2| Franza, F., Wilson, R.N.: “Status of the European Southern Observatory new Technology Telescope Project” Advanced Technology Optical Telescopes, SPIE Proceeding Vol. 332, 1982, 90–101.Google Scholar
|3| Ballio, G., Citterio, O., Contro, R., Poggi, C.: “A mathematical approach to the optimum design of the support system for actively controlled primary mirror” (To be published).Google Scholar
|4| Timoshenko, S., Woinowsky-Krieger, S.: “Theory of plates and shells” McGraw-Hill Inc. 1959.Google Scholar
|5| Citterio, O., Conti, G., Franza, F., Mattaini, E.: “Support system for the 1 m ESO Active Optics Experiment” (This conference).Google Scholar
|6| Wilson, R.N.: “NTT Support” (This conference).Google Scholar
|7| Franza, F., Le Luyer, M., Wilson, R.N.: “ESO TECHNICAL REPORT No. 8, 1977”.Google Scholar