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Proceedings Paper

Inductive edge sensors: an innovative solution for ELT segmented mirror alignment monitoring
Author(s): Didier Rozière; Bruno Luong; Bernard Fuchs; Ambroise Périn; Christian Néel; Samuel Lévèque
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Paper Abstract

The largest telescopes (ELT) involve a highly segmented primary mirror. The monitoring of the mirror shape use thousands of sensors, located on segment edges, which measure the relative piston, tip and tilt of all segments. Today, telescopes with segmented primary mirrors use capacitance-based edge sensors. Although this technology offers excellent metrological performances, its practical use is limited by the intrinsic sensitivity to humidity, dust and condensation, whose effect exceeds the requirements for future ELTs. Being specialized in both capacitive and inductive metrology, Fogale nanotech has developed a novel concept of edge sensors using the inductive technology, which does not suffer from humidity, condensation, and dust effects. Cost effective sensor with specific layout, associated electronics, demonstrated metrological performance (sub-nanometer resolution and nanometer stability) that outperforms the capacitive concept.

Paper Details

Date Published: 10 July 2008
PDF: 14 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701217 (10 July 2008); doi: 10.1117/12.789444
Show Author Affiliations
Didier Rozière, FOGALE nanotech (France)
Bruno Luong, FOGALE nanotech (France)
Bernard Fuchs, FOGALE nanotech (France)
Ambroise Périn, FOGALE nanotech (France)
Christian Néel, FOGALE nanotech (France)
Samuel Lévèque, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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