Design of a Lightweight Mounted TipTilt Mirror Design Problem 4 Large Mirror Mount To Do List Type of lightweight Mirror material and coating Linear actuator Mount and flexure design Lightweighting ID: 1040147
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1. Mike BordenOPTI 5234/6/09Design of a Lightweight Mounted Tip/Tilt Mirror
2. Design Problem 4: Large Mirror Mount
3. To Do ListType of lightweightMirror material and coatingLinear actuatorMount and flexure design
4. LightweightingContoured BackSandwich, and Open Back
5. Lightweighting
6. Lightweighting
7. Mirror MaterialConsiderationsHigh stiffness to weightEase of manufactureMinimal thermal stressesCostMain materials being consideredULE, Zerodur, Fused Silica, Beryllium, Aluminum, BK7
8. Mirror Material
9. Mirror Materials
10. Mirror MaterialPossibilitiesPure Beryllium mirrorExpensive and difficult to manufactureThermal considerations non-issueFused Silica, BK7, Aluminum substrate w/ silver coatingAluminum w/ silver coating provides smallest ∆𝛂 (23 ppm / K and 18.9 ppm/ K)Thermal expansion / contraction an issueSomething crazier – Copper, Brass, Beryllium Copper, Stainless
11. Optical SpecificationsSilver CoatingMeets spectrum requirements
12. Optical SpecificationsError Budget – 30 nm rms WFEMirror surface roughness (∆S)20 nm rmsSelf weight deflection (δ)20 nm rmsBeam diameter200 mm diameter mirror accommodates 150 mm beam diameter
13. Mounting Concept
14. Mounting Concept
15. Mounting ConceptInvar SleeveSpherical BearingMicrometer
16. Remaining TasksVerify number of supportsReflectance of BeTolerance bearings for thermal loadingFlexure design – dimensions, materialFEA analysis of deflection / thermal loading, resonant frequencyLinear actuator / micrometer selection