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Real-time advanced ultrasonic imaging of assemblies of glass and SiC mirrors of the extremely large telescope

Article dans une revue avec comité de lecture
Author
ccDUCOUSSO, Mathieu
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
BOUJON, Eric
REVERDY, Frédéric
BANNOUF, Souad
535973 EXTENDE
PUEL, Benoit
LONNÉ, Sebastien
535973 EXTENDE
GUGGENHEIM, Alexandra
MALLET, Florent
TONNELLIER, Xavier
MERCIER-NALLET, Hugo
LAMOUR, Claire
FRAPOLLI, Camille

URI
http://hdl.handle.net/10985/26086
DOI
10.1007/s00170-024-14939-0
Date
2024-12-21
Journal
The International Journal of Advanced Manufacturing Technology

Abstract

The Extremely Large Telescope of the European Southern Observatory (ESO) is currently under construction and is expected to become the world's largest optical/near-infrared terrestrial astronomical observatory. Its optical design incorporates five mirrors of varying shapes, sizes, and materials. The primary mirror, with a diameter of 39 m, is perhaps the most remarkable. The fifth mirror (M5), made of SiC, ranks among the largest tip-tilt mirrors globally. Various structural joining techniques, such as bonding and brazing, are applied to these optical components to enable nanometric relative positioning between the assembled parts. This study reviews advanced real-time ultrasonic imaging based on Total Focusing Methods (TFM) for their inspection. For the M1 mirror, TFM is utilized in a tandem configuration for regular industrial use and is also applied once with Rayleigh waves to inspect the surface and subsurface of the M5 mirror.

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