mel strachan ukatc ao tech talk 9 sept...mel strachan ukatc ao tech talk 9 sept author ggj78158...
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![Page 1: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/1.jpg)
September 2009
![Page 2: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/2.jpg)
September 2009
ROE Astronomy technology 1865
Tin camera employed at the Great Pyramid
By Piazzi Smyth in 1865
![Page 3: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/3.jpg)
September 2009
![Page 4: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/4.jpg)
September 2009
ELT mirrors
![Page 5: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/5.jpg)
September 2009
5 mirror design
![Page 6: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/6.jpg)
September 2009
Large adaptive mirror
![Page 7: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/7.jpg)
September 2009
Large adaptive mirror concept2.5m
8000 actuators!
![Page 8: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/8.jpg)
September 2009
“Flexible Silicon carbide”Silicon infiltrated carbon
carbon composite
Young’s modulus of 107GPa (comparable to glass)
but with a fracture toughness of 126MPa√m
(c.f. glass approximately1MPa√m)
New material development
![Page 9: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/9.jpg)
September 2009
essential equipment!extract the essentials
![Page 10: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/10.jpg)
September 2009
1mm thick ‘flexible’ silicon carbide with optical surface
• New material 100x fracture toughness of glass
•Stiffness comparable to glass
•Stiff actuators overcome compliance of and thermal dissipation voice coil
•Modification of existing device
Large adaptive mirror new technology
![Page 11: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/11.jpg)
September 2009
40mm test piece
![Page 12: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/12.jpg)
September 2009
![Page 13: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/13.jpg)
September 2009
Deflection test
![Page 14: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/14.jpg)
September 2009
Novel disc actuator
![Page 15: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/15.jpg)
September 2009
Novel disc actuator
![Page 16: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/16.jpg)
September 2009
Novel disc actuator
![Page 17: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/17.jpg)
September 2009
12345
Royal Observatory
Bl ackford Hill
Edi nburgh
EH9 3HJ
Gen. Tol.
Description
Material
Dwg. #
Finish
PROJECT ISSUESHT
DRAWN BY
MF G. APPROVE D BY
DATE
DATE
DES IG NED BY DATE
+/-
APPRO VE D BY DATE
Mirror flex test assembly
13/08/2009
NA
dm
dm 01/09/2009
NA
USED ON
P arts List
REVIS ITITLEPA RT NUMBERQTITE
AMirror actuator baseplateMirror def baseplate11
NANoliac ML-06-101Disc actuator32
ADisc actuator padDisc actuator pad33
Float glass stripFacesheet14
1
2 3 4
Note 1. Actuators, pads and facesheet to be epoxy bonded
![Page 18: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/18.jpg)
September 2009
Test assembly
![Page 19: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/19.jpg)
September 2009
• Sapphire bonded with sodium silicate
– Typical breaking stress 1.5MPa
• Heavy glass bonded with sodium silicate
– Breaking stress comparable with silica-silica bonds as in GEO600
Glass IFU Technology
Silicate Bonding – Strength Tests
University of Glasgow
Institute of Gravitational Research
![Page 20: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/20.jpg)
September 2009
43 Kg
University of Glasgow
Institute of Gravitational Research
Shear test
![Page 21: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/21.jpg)
September 2009
Bonding process
![Page 22: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/22.jpg)
September 2009
Bonding technology :
• Stress free bonding - minimising distortions
• Can be de-bonded – saving valuable components
• Positioning of components before bond sets (time to bond controllable) – unlike optical contacting
• Suited to cryogenic environment
• Range of material now extending (requires oxide)
• Bond line to 100nm ( research to 80nm)
Technological advantages
![Page 23: Mel Strachan UKATC AO tech talk 9 sept...Mel Strachan UKATC AO tech talk 9 sept Author ggj78158 Created Date 9/16/2009 4:03:03 PM](https://reader033.vdocument.in/reader033/viewer/2022060508/5f231c6f68b3b911be01c7dd/html5/thumbnails/23.jpg)
September 2009
Technical advantages
• Thin deformable mirrors (5mm!)
• Light weight mirrors for space applications (4kg/m^2) for 1.5mm face sheet
• Large actuator deflections possible
+/- 47 micron with a 0.7mm thick disc actuator
• Elimination of additional active mirrors
____________ Thanks! ________________