1 / 20

Another Modular Focal Plane: Part 2 – FP assembly

Another Modular Focal Plane: Part 2 – FP assembly. Bruce C. Bigelow University of Michigan Department of Physics 5/17/04. Modular focal plane assembly. Motivations: install/remove single detectors from “front” of FP assemble detectors in modules of 3 x 3

macy-holden
Download Presentation

Another Modular Focal Plane: Part 2 – FP assembly

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Another Modular Focal Plane:Part 2 – FP assembly Bruce C. Bigelow University of Michigan Department of Physics 5/17/04

  2. Modular focal plane assembly Motivations: • install/remove single detectors from “front” of FP • assemble detectors in modules of 3 x 3 • simplify assembly, integration, and test • reduce part counts, simplify part design • simplify part fabrication • individual module thermal control (Vis vs. IR) • optimize materials for detector packages (CTE) • local, discrete control of focal plane surface height • minimize mechanical mass • minimize thermal time constants • minimize gravity deflections for ground testing • maximize resonant frequencies

  3. Focal Plane Baseplate Requirements: • final focal plane flatness: +/- 25 microns • detector temperature stability +/- 1K • high stiffness – high first resonance This talk: • sample base-plate designs • two materials examined • base-plate FEA

  4. FP Baseplate design and FEA • Design of baseplate • consider Al 7075 and Moly MZT materials • three mounting points to optics bench via bipods • bipods not included in design or FEA • cut-outs for detector access

  5. Focal plane base-plate - front Note webs in access holes – not in FEA models

  6. Focal plane base-plate - back Base-plate rib structure – simpler than FEA model

  7. Focal plane fully populated

  8. FP Baseplate design and FEA • FEA • consider Al 7075 and Moly MZT materials • Moly plate is 50 mm thick: 31 Kg • Al. plate is 75 mm thick: 13 Kg • sub-array loads modeled with point masses • static and dynamic analyses completed

  9. FP Baseplate FEA rib thickness: red - 6 mm purple - 5 mm cyan - 6 mm blue - 10 mm

  10. FP Baseplate FEA sub-modules as point masses 1.0 kg 0.5 kg 16 Kg total sub- module mass

  11. FP Baseplate FEA – Al 7075 (meters) Gy, Y deflections – 1.8 microns max

  12. FP Baseplate FEA – Al 7075 (meters) Gy, Z deflections – 2.1 microns PV

  13. FP Baseplate FEA – Al 7075 (meters) Gz, Z deflections – 4.8 microns

  14. FP Baseplate FEA – Al 7075 • Mode/Freq. • 227 Hz • 238 Hz • 261 Hz • 325 Hz • 522 Hz Dynamic analysis – first mode

  15. FP Baseplate FEA – MZT (meters) Gy, Y deflections – 0.8 microns PV

  16. FP Baseplate FEA – MZT (meters) Gy, Z deflections – 1.1 microns PV

  17. FP Baseplate FEA – MZT (meters) Gz, Z deflections – 4.2 microns PV

  18. FP Baseplate FEA – MZT • Mode/Freq. • 249 Hz • 258 Hz • 290 Hz • 491 Hz • 654 Hz Dynamic analysis – first mode

  19. Baseplate FEA Summary

  20. FP Modular Baseplate • Conclusions: • sample designs stiff, high resonances • flatness specs met in two orientations (and probably all) • consider other substrate materials (Ti, CF)? • refine interfaces • spectrograph, BITE sources, cryostat mounts • thermal links, detect. wiring, baffles, shields • optimize design for loads and material (ribs, thicknesses, etc)

More Related