The metrology system of the European ALMA project: thermal and wind pointing error corrections

F. Rampini; G. Marchiori; L. Ghedin; R. Biasi; S. Stanghellini

doi:10.1117/12.789855

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17 July 2008 The metrology system of the European ALMA project: thermal and wind pointing error corrections

F. Rampini, G. Marchiori, L. Ghedin, R. Biasi, S. Stanghellini

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Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70120R (2008) https://doi.org/10.1117/12.789855
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

In the ALMA project, in order to achieve the specification, very important is the use of a metrology instrument able to correct the non repeatable errors. Errors induced by wind or temperature variations inside the structure that are non systematic have to be predicted and corrected by an active system. During design phase, CFD and thermal analyses have been performed in order to identify the whole behaviour of the structure and the relative corrections formulas. Innovative instruments and layout have been studied from the prototype to the production phase.

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F. Rampini, G. Marchiori, L. Ghedin, R. Biasi, and S. Stanghellini "The metrology system of the European ALMA project: thermal and wind pointing error corrections", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70120R (17 July 2008); https://doi.org/10.1117/12.789855

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