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Proceedings Paper

Inductive sensors based on embedded coil technology for nanometric inter-segment position sensing of the E-ELT
Author(s): Martin Wasmeier; Josef Hackl; Samuel Leveque
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Paper Abstract

The primary mirror of the E-ELT consists of a mosaic of 798 hexagonal mirror segments whose relative positions will be measured by 4524 so-called edge sensors. The main properties of these three axes edge sensors are nanometric precision, high linearity, low sensitivity to temperature and humidity fluctuations as well as high reliability. This paper presents the outcome of a development carried out by Micro-Epsilon in the framework of prototype activities launched by the European Southern Observatory several years ago. The performance of inductive sensors based on Embedded Coil Technology are presented as well as results obtained on representative operational conditions.

Paper Details

Date Published: 22 July 2014
PDF: 13 pages
Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91451R (22 July 2014); doi: 10.1117/12.2054579
Show Author Affiliations
Martin Wasmeier, Micro-Epsilon Messtechnik GmbH & Co. KG (Germany)
Josef Hackl, Micro-Epsilon Messtechnik GmbH & Co. KG (Germany)
Samuel Leveque, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 9145:
Ground-based and Airborne Telescopes V
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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