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Proceedings Paper • Open Access

The HSOB GAIA: a cryogenic high stability cesic optical bench for missions requiring sub-nanometric optical stability
Author(s): Pascal Courteau; Anne Poupinet; Mathias Kroedel; Giuseppe Sarri

Paper Abstract

Global astrometry, very demanding in term of stability, requires extremely stable material for optical bench. CeSiC developed by ECM and Alcatel Alenia Space for mirrors and high stability structures, offers the best compromise in term of structural strength, stability and very high lightweight capability, with characteristics leading to be insensitive to thermo-elastic at cryogenic T°. The HSOB GAIA study realised by Alcatel Alenia Space under ESA contract aimed to design, develop and test a full scale representative High Stability Optical Bench in CeSiC. The bench has been equipped with SAGEIS-CSO laser metrology system MOUSE1, Michelson interferometer composed of integrated optics with a nm resolution. The HSOB bench has been submitted to an homogeneous T° step under vacuum to characterise the homothetic behaviour of its two arms. The quite negligible inter-arms differential measured with a nm range reproducibility, demonstrates that a complete 3D structure in CeSiC has the same CTE homogeneity as characterisation samples, fully in line with the GAIA need (1pm at 120K). This participates to the demonstration that CeSiC properties at cryogenic T° is fully appropriate to the manufacturing of complex highly stable optical structures. This successful study confirms ECM and Alcatel Alenia Space ability to define and manufacture monolithic lightweight highly stable optical structures, based on inner cells triangular design made only possible by the unique CeSiC manufacturing process.

Paper Details

Date Published: 21 November 2017
PDF: 9 pages
Proc. SPIE 10567, International Conference on Space Optics — ICSO 2006, 105670O (21 November 2017); doi: 10.1117/12.2308157
Show Author Affiliations
Pascal Courteau, Alcatel Alenia Space (France)
Anne Poupinet, SAGEIS-CSO (France)
Mathias Kroedel, ECM Engineered Ceramic Materials GmbH (Germany)
Giuseppe Sarri, ESA-ESTEC (Netherlands)

Published in SPIE Proceedings Vol. 10567:
International Conference on Space Optics — ICSO 2006
Errico Armandillo; Josiane Costeraste; Nikos Karafolas, Editor(s)

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