18 July 2014 Conceptual design of a cryogenic pupil mechanism with continuous complex movements for HARMONI
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Abstract
In order to improve the signal-to-noise ratio of HARMONI (E-ELT first light visible and near-infrared integral field VIR spectrometer), a pupil mask has been identified to be included at the fore-optics to limit the background radiation coming into the spectrographs. This mask should rotate synchronously with the telescope pupil during observations, taking into account the combined effects of the telescope tracking and the de-rotation of the FOV. The implementation of the pupil mask functionality will require complex movements with high precision at cryogenic temperatures which implies an important technological challenge. This paper details a set of experiments completed to gain knowledge and experience in order to accomplish the design and control of cryogenic mechanisms reaching this type of pupil motion. The conceptual design of the whole mechanism started from the feedback acquired from those experiments is also described in the following sections.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Elvio Hernández, Elvio Hernández, Luis F. Rodríguez, Luis F. Rodríguez, José V. Gigante, José V. Gigante, Oscar Tubío, Oscar Tubío, Tomas Moreno, Tomas Moreno, Jorge Sánchez, Jorge Sánchez, José M. Herreros, José M. Herreros, Begoña Garcia, Begoña Garcia, Evencio Mediavilla, Evencio Mediavilla, Niranjan Thatte, Niranjan Thatte, Ian Bryson, Ian Bryson, Hermine Schnetler, Hermine Schnetler, Fraser Clarke, Fraser Clarke, Matthias Tecza, Matthias Tecza, } "Conceptual design of a cryogenic pupil mechanism with continuous complex movements for HARMONI", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91513F (18 July 2014); doi: 10.1117/12.2055933; https://doi.org/10.1117/12.2055933
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