Key challenges for the production of ELT M1 segments at Safran Reosc

被引：2
|
作者：
Frapolli, Camille [1 ]
Bardon, Dominique [1 ]
Ferachoglou, Nicolas [1 ]
Chaussat, Gilles [1 ]
Haret, Laurent-Daniel [1 ]
Hatzigeorgopoulos, Justine [1 ]
Armougom, Julie [1 ]
Pron, Mathieu [1 ]
Lesongeur, Pauline [1 ]
Boillet, Frederic [2 ]
Bourgois, Remi [2 ]
Denis, Alain [2 ]
Julienne, Sebastien [2 ]
Gouedard, Marc [2 ]
Foerster, Andreas [3 ]
Cayrel, Marc [3 ]
机构：
[1] Safran Reosc, Ave Tour Maury, F-91280 St Pierre Perray, France
[2] Safran Elect & Def, Ave Hauts Chaume, F-86280 St Benoit, France
[3] ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany
来源：
ADVANCES IN OPTICAL AND MECHANICAL TECHNOLOGIES FOR TELESCOPES AND INSTRUMENTATION V | 2022年 / 12188卷
关键词：
segmented mirror; polishing; metrology; ion beam figuring; ELT; bonding; surface deformation; factory; 4.0;
D O I：
10.1117/12.2626800
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In 2017, the European Southern Observatory (ESO) awarded a contract for the manufacturing of the segments of the primary mirror for the Extremely Large Telescope (ELT) to Safran Reosc. Since then, we designed a production unit dedicated for ELT M1. From spherical mirror blanks, we first glue 39 pads per segment. We then shape, polish and cut the segments with 133 different off-axis aspheric definitions. We finish them to nanometer accuracy using ion beam figuring and a fully automated interferometric test bench. Now manufacturing has begun, we present the solutions and methods that we developed to manufacture more than one segment per day.
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页数：13
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