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Proceedings Paper

Semi-kinematic mount of the FIREBALL large optics
Author(s): C. Rossin; R. Grange; B. Milliard; L. Martin; G. Moreaux; P. Blanchard; J.-M. Deharveng; J. Evrard; C. Martin; R. McLean; D. Schiminovich
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Paper Abstract

In the context of the NASA CNES FIREBALL balloon borne experiment, we present the design of a semi-kinematic mount to hold the 1 meter class mirrors of this mission. To maintain these large optics in a reasonable mass and price budgets we choose thin ULE mirrors with a thickness over diameter ratio of 1/16. Such thin mirrors require a multi support mount to reduce self weight deflection. Classical multi support mount used for ground based telescope would not survive the level of shock observed in a balloon experiment either at parachute opening or landing. To firmly maintain these mirrors in several points without noticeably deforming them we investigated the design of a two stages semi-kinematic mount composed of 24 monopods. We present the detailed design of this innovative mirror mount, the finite element modeling with the deduced optical wavefront deformation. During the FIREBALL integration and flight campaign in July 2007 at CSBF, we confirmed the validity of the mechanical concept by obtaining an image quality well within the required specifications. Variants of this approach are potentially applicable to large thin mirrors on ground-based observatories.

Paper Details

Date Published: 23 July 2008
PDF: 11 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70181Q (23 July 2008); doi: 10.1117/12.788917
Show Author Affiliations
C. Rossin, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
R. Grange, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
B. Milliard, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
L. Martin, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
G. Moreaux, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
P. Blanchard, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
J.-M. Deharveng, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
J. Evrard, CNES Ctr. Spatial de Toulouse (France)
C. Martin, California Institute of Technology (United States)
R. McLean, California Institute of Technology (United States)
D. Schiminovich, Columbia Univ. (United States)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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