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Proceedings Paper

Design and prototype performance of an innovative cryogenic tip-tilt mirror
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Paper Abstract

Cryogenic mechanisms are needed for the alignment plan of MATISSE, a mid-infrared spectro-interferometer for the European Southern Observatory Very Large Telescope Interferometer (ESO VLTI) that combines up to four Unit Telescopes or Auxiliary Telescopes. Telescope beams are split into 16 beams that need to be aligned on the detector and corrected for OPD (Optical path difference) in order to create an interference pattern. Alignment accuracy and stability specifications are of the order of nanometers and arcsec's. These specifications cannot be met by warm alignment nor by manufacturing tolerances, therefore 16 motorized tip-tilt units are needed that operate in a vacuum cryogenic environment. Key aspects of the mechanisms are that the optical element and mechanism are combined in a compact single component, driven by self braking piezo actuators in order to hold position without power. The design, realization and test results of these mechanisms are presented.

Paper Details

Date Published: 20 July 2010
PDF: 7 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77394A (20 July 2010); doi: 10.1117/12.856585
Show Author Affiliations
Huub Janssen, Janssen Precision Engineering B.V. (Netherlands)
Maurice Teuwen, Janssen Precision Engineering B.V. (Netherlands)
Ramón Navarro, NOVA-ASTRON (Netherlands)
Niels Tromp, NOVA-ASTRON (Netherlands)
Eddy Elswijk, NOVA-ASTRON (Netherlands)
Hiddo Hanenburg, NOVA-ASTRON (Netherlands)


Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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