Cryo-optical testing of large aspheric reflectors operating in the sub mm range

S. Roose; Y. Houbrechts; A. Mazzoli; N. Ninane; Y. Stockman; R. Daddato; V. Kirschner; L. Venacio; D. de Chambure

doi:10.1117/12.674086

30 May 2006 Cryo-optical testing of large aspheric reflectors operating in the sub mm range

S. Roose, Y. Houbrechts, A. Mazzoli, N. Ninane, Y. Stockman, R. Daddato, V. Kirschner, L. Venacio, D. de Chambure

Proceedings Volume 6148, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 61480F (2006) https://doi.org/10.1117/12.674086
Event: 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2005, Xian, China

Abstract

The cryo-optical testing of the PLANCK primary reflector (elliptical off-axis CFRP reflector of 1550 mm x 1890 mm) is one of the major issue in the payload development program. It is requested to measure the changes of the Surface Figure Error (SFE) with respect to the best ellipsoid, between 293 K and 50 K, with a 1 μm RMS accuracy. To achieve this, Infra Red interferometry has been used and a dedicated thermo mechanical set-up has been constructed. This paper summarises the test activities, the test methods and results on the PLANCK Primary Reflector - Flight Model (PRFM) achieved in FOCAL 6.5 at Centre Spatial de Liege (CSL). Here, the Wave Front Error (WFE) will be considered, the SFE can be derived from the WFE measurement. After a brief introduction, the first part deals with the general test description. The thermo-elastic deformations will be addressed: the surface deformation in the medium frequency range (spatial wavelength down to 60 mm) and core-cell dimpling.

Citation Download Citation

S. Roose, Y. Houbrechts, A. Mazzoli, N. Ninane, Y. Stockman, R. Daddato, V. Kirschner, L. Venacio, and D. de Chambure "Cryo-optical testing of large aspheric reflectors operating in the sub mm range", Proc. SPIE 6148, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 61480F (30 May 2006); https://doi.org/10.1117/12.674086

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