Ground-Based and Airborne Telescopes VII 2018
DOI: 10.1117/12.2312665
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ESO ELT optomechanics: construction status

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Cited by 6 publications
(8 citation statements)
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“…The tip-tilt mirror M5 is a flat monolithic mirror sized � 2:2 m � 2:7m providing exclusively large tip and tilt corrections. M5 is actuated by three piezo-electric drives and its mirror tile is a lightweight structure made of silicon carbide [2,36].…”
Section: Metis-scao Systemmentioning
confidence: 99%
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“…The tip-tilt mirror M5 is a flat monolithic mirror sized � 2:2 m � 2:7m providing exclusively large tip and tilt corrections. M5 is actuated by three piezo-electric drives and its mirror tile is a lightweight structure made of silicon carbide [2,36].…”
Section: Metis-scao Systemmentioning
confidence: 99%
“…The reflective annulus has an inner diameter of � 0:5 m, an outer diameter of � 2:5m, and is realized via a thin ( , < 10 nm) aluminium layer on top of the segments. M4 can adopt arbitrary (out-of-plane) deformations with small amplitudes ( � 50 μm) and high spatial frequencies utilizing � 5350 actuators [2,37].…”
Section: Deformable Mirror M4mentioning
confidence: 99%
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“…A honeycomb is a construction that offers the largest volume (honey) for the minimum structure (beeswax) and it is created from two sets of hexagonal prisms ending in three rhomboidal faces placed back-to-back and offset to create a perfect tessellation, 20 as shown in Figure 15. A approximation to the honeycomb design has been an inspiration for several telescope mirror geometries 21,22 as well as mirror lightweighting structures; 23,24 however, applying the exact honeycomb cell geometry is challenging within traditional machining. The objective of this study is to apply the honeycomb construction that is seen in nature to create a lightweight sandwich mirror which exhibits two solid face plates and a rhombic dodecahedron interior.…”
Section: Honeycomb Designmentioning
confidence: 99%
“…One example for such loads is bonded fixtures of mirror segments to support frames, which are planned for the European Extremely Large Telescope (ELT). 5 Glued bonds exert forces to the glass-ceramic due to glue shrinkage stress. Additional forces arise from the weight changing with different observation angles and from the inline segment shape optimization.…”
Section: Introductionmentioning
confidence: 99%