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Proceedings Paper • Open Access

Coupled thermo-elastic and optical performance analyses of a reflective baffle for the BepiColombo laser altimeter (BELA) receiver
Author(s): E. Heesel; T. Weigel; P. Lochmatter; E. Rugi Grond

Paper Abstract

For the BepiColombo mission, the extreme thermal environment around Mercury requires good heat shields for the instruments. The BepiColombo Laser altimeter (BELA) Receiver will be equipped with a specular reflective baffle in order to limit the solar power impact. The design uses a Stavroudis geometry with alternating elliptical and hyperbolic vanes to reflect radiation at angles >38° back into space. The thermal loads on the baffle lead to deformations, and the resulting changes in the optical performance can be modeled by ray-tracing. Conventional interfaces, such as Zernike surface fitting, fail to provide a proper import of the mechanical distortions into optical models. We have studied alternative models such as free form surface representations and compared them to a simple modeling approach with straight segments. The performance merit is presented in terms of the power rejection ratio and the absence of specular stray-light.

Paper Details

Date Published: 21 November 2017
PDF: 6 pages
Proc. SPIE 10566, International Conference on Space Optics — ICSO 2008, 105661W (21 November 2017); doi: 10.1117/12.2308252
Show Author Affiliations
E. Heesel, Oerlikon Space AG (Switzerland)
T. Weigel, Oerlikon Space AG (Switzerland)
P. Lochmatter, Oerlikon Space AG (Switzerland)
E. Rugi Grond, Oerlikon Space AG (Switzerland)

Published in SPIE Proceedings Vol. 10566:
International Conference on Space Optics — ICSO 2008
Josiane Costeraste; Errico Armandillo; Nikos Karafolas, Editor(s)

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