Large aluminium convex mirror for the cryo-optical test of the Planck primary reflector

P. Gloesener; C. Flébus; M. Cola; S. Roose; Y. Stockman; D. de Chambure

doi:10.1117/12.2308136

21 November 2017 Large aluminium convex mirror for the cryo-optical test of the Planck primary reflector

P. Gloesener, C. Flébus, M. Cola, S. Roose, Y. Stockman, D. de Chambure

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Proceedings Volume 10567, International Conference on Space Optics — ICSO 2006; 1056712 (2017) https://doi.org/10.1117/12.2308136
Event: International Conference on Space Optics 2006, 2006, Noordwijk, Netherlands

Abstract

In the frame of the PLANCK mission telescope development, it is requested to measure the reflector changes of the surface figure error (SFE) with respect to the best ellipsoid, between 293 K and 50 K, with 1 μm RMS accuracy. To achieve this, Infra Red interferometry has been selected and a dedicated thermo mechanical set-up has been constructed.

In order to realise the test set-up for this reflector, a large aluminium convex mirror with radius of 19500 mm has been manufactured. The mirror has to operate in a cryogenic environment lower than 30 K, and has a contribution to the RMS WFE with less than 1 μm between room temperature and cryogenic temperature.

This paper summarises the design, manufacturing and characterisation of this mirror, showing it has fulfilled its requirements.

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P. Gloesener, C. Flébus, M. Cola, S. Roose, Y. Stockman, and D. de Chambure "Large aluminium convex mirror for the cryo-optical test of the Planck primary reflector", Proc. SPIE 10567, International Conference on Space Optics — ICSO 2006, 1056712 (21 November 2017); https://doi.org/10.1117/12.2308136

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