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Proceedings Paper

Manufacturing of a 3D complex hyperstable Cesic structure
Author(s): Matthias Kroedel; Pascal Courteau; Anne Poupinet; Giuseppe Sarri
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Paper Abstract

Global astrometry requires extremely stable materials for instrument structures, such as optical benches. Cesic®, developed by ECM and Thales Alenia Space for mirrors and high stability structures, offers an excellent compromise in terms of structural strength, stability and very high lightweight capability, with a coefficient of thermal expansion that is virtually zero at cryogenic T°. The High-Stability Optical Bench (HSOB) GAIA study, realized by Thales Alenia Space under ESA contract, aimed to design, develop and test a full-scale representative of the HSOB bench, made entirely of Cesic®. The bench has been equipped with SAGEIS-CSO laser metrology system MOUSE1, a Michelson interferometer composed of integrated optics with nm-resolution. The HSOB bench has been submitted to a homogeneous T° step under vacuum to characterize 3-D expansion behavior of its two arms. The quite negligible interarm differential, measured with a nm-range reproducibility, demonstrates that a complete 3-D structure made of Cesic® has the same CTE homogeneity as do characterization samples, fully in line with the stringent GAIA requirements (1ppm at 120K). This demonstrates that Cesic® properties at cryogenic temperatures are fully appropriate to the manufacturing of complex highly stable optical structures. This successful study confirms ECM's and Thales Alenia Space's ability to design and manufacture monolithic lightweight highly stable optical structures, based on inner-cell triangular design made possible by the unique Cesic® manufacturing process.

Paper Details

Date Published: 17 September 2007
PDF: 11 pages
Proc. SPIE 6666, Optical Materials and Structures Technologies III, 66660N (17 September 2007); doi: 10.1117/12.730627
Show Author Affiliations
Matthias Kroedel, ECM (Germany)
Pascal Courteau, Thales Alenia Space (France)
Anne Poupinet, SAGEIS CSO (France)
Giuseppe Sarri, ESA (Netherlands)

Published in SPIE Proceedings Vol. 6666:
Optical Materials and Structures Technologies III
William A. Goodman; Joseph L. Robichaud, Editor(s)

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