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Proceedings Paper

LISA telescope assembly optical stability characterization for ESA
Author(s): Adrianus L. Verlaan; Harmen Hogenhuis; Joep Pijnenburg; Martin Lemmen; Stefano Lucarelli; Dietmar Scheulen; David Ende
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Paper Abstract

The LISA Optical Stability Characterization project is part of the LISA CTP activities to achieve the required Technonlogy Readiness Level (TRL) for all of the LISA technologies used. This activity aims demonstration of the Telescope Assembly (TA), with a structure based on CFRP technology, that a CTE of 10-7 1/K can be achieved with measures to tune the CTE to this level. In addition the demonstration is required to prove that the structure exhibits highly predictable mechanical distortion characteristics when cooling down to -90°C, during outgassing in space and when going from 1g environment to 0g. This paper describes the test facilities as well as the first test results. A dedicated test setup is designed and realized to allow monitoring dimensional variations of the TA using three interferometers, while varying the temperature in a thermal vacuum chamber. Critical parameters of the verification setup are the length metrology accuracy in thermal vacuum and the thermal vacuum flexibility and stability. The test programme includes Telescope Assembly CTE measurements and thermal gradient characterization.

Paper Details

Date Published: 13 September 2012
PDF: 7 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845003 (13 September 2012); doi: 10.1117/12.925112
Show Author Affiliations
Adrianus L. Verlaan, TNO (Netherlands)
Harmen Hogenhuis, TNO (Netherlands)
Joep Pijnenburg, TNO (Netherlands)
Martin Lemmen, TNO (Netherlands)
Stefano Lucarelli, EADS Astrium GmbH (Germany)
Dietmar Scheulen, EADS Astrium GmbH (Germany)
David Ende, xperion AEROSPACE GmbH (Germany)

Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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