文献类型： 会议论文

第一作者： Matthias Kroedef

作者： Matthias Kroedef ¹ ; Pascal Courteau ² ; Anne Poupinet ³ ; Giuseppe Sarri ⁴ ;

作者机构： 1.ECM, Am Bleichbach JO, 85452 Moosinning, Germany

2.Thales Alenia Space, 100 bd. du midi, 06156 Cannes la Bocca, France

3.SAGEIS CSO, 70 avenue des Martryr, 38000 Grenoble, France

4.ESA, postbus 299, 2200 Noordwijk, Netherlands

关键词： Space structures;Ceramic structures;high stability structure

会议名称： Optical materials and structures technologies III :

主办单位：

页码： 66660N-1-66660N-11

摘要： 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.

分类号： N5