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Proceedings Article

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

[+] Author Affiliations
S. Roose, Y. Houbrechts, A. Mazzoli, N. Ninane, Y. Stockman

Univ. of Liège (Belgium)

R. Daddato, V. Kirschner, L. Venacio, D. de Chambure

ESTEC-European Space Agency (Netherlands)

Proc. SPIE 6148, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 61480F (May 30, 2006); doi:10.1117/12.674086
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From Conference Volume 6148

  • 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
  • Yudong Zhang; Wenhan Jiang; Myung K. Cho
  • Xian, China | November 02, 2005

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.

© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

S. Roose ; Y. Houbrechts ; A. Mazzoli ; N. Ninane ; Y. Stockman, et al.
"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 (May 30, 2006); doi:10.1117/12.674086; http://dx.doi.org/10.1117/12.674086


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