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FPU CDR

FPU CDR. MCS HIFI MECHANISMS Focal Plane Chopper (FPC) Diplexer Rooftop Mirror Translator (DRT) Pivot development Presented by Wim Aalders. Focal Plane Chopper. 1 DM to be delivered to the FCU-DM;

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FPU CDR

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  1. FPU CDR HIFI MCS HIFI MECHANISMS Focal Plane Chopper (FPC) Diplexer Rooftop Mirror Translator (DRT) Pivot development Presented by Wim Aalders

  2. Focal Plane Chopper • 1 DM to be delivered to the FCU-DM; • 2 QM’s one to be delivered to the FCU-CQM, another to be subjected to long duration qualification tests • 1 FM to be delivered to the the FCU-FM • 1 set of critical spare parts (pivots, connectors, motor) to refurbish a QM to FM spare when necessary. During the development of the FPC there shall be: MECHANISMS W. Aalders

  3. Functional Requirements Rotation of M6 from –4.8º to 8º Fast movement from –4.8º to 0º -3 to 0 arcmin at the sky 20 msec full amplitude change 5 Hz square, 80% duty cycle Slow movement from 0º to 8º i.e Calibration mode HBB & CBB FPC Requirements MECHANISMS W. Aalders

  4. FPC Requirements Additional Requirements • Positional accuracy: 1 arcmin (0.6 arcsec @ sky) • Lifetime • 108 cycles fast mode • 105 cycles slow mode (i.e. calibration mode) • Power consumption • < 2 mW in fast mode • < 3 mW in calibration mode MECHANISMS W. Aalders

  5. FPC Layout (DM) MECHANISMS W. Aalders

  6. FPC Layout (DM) MECHANISMS W. Aalders

  7. FPC Layout (DM) MECHANISMS W. Aalders

  8. FPC Layout (DM) MECHANISMS W. Aalders

  9. TESTS (on FPC-DM) • Performance (@ RT) • Angle vs current • Angle vs time • Vibration response(@ RT) • Cryo-performance • Health check MECHANISMS W. Aalders

  10. Rotation vs current MECHANISMS W. Aalders

  11. Rotation vs time MECHANISMS W. Aalders

  12. Vibration response (FPC DM) MECHANISMS W. Aalders

  13. Diplexer Roof top mirror Translator • 1 DM type A to be delivered to the FCU-DM; • 2 QM’s type A to be delivered to the FCU-CQM • 6 FM’s type A to be delivered to the the FCU-FM • 4 FM’s type B to be delivered to the the FCU-FM • 1 FM type A as a spare • 1 FM type B as a spare During the development of the DRT there shall be: MECHANISMS W. Aalders

  14. DRT Requirements Functional Requirements • Translation of rooftop mirror of ± 150 µm • Precision and stability 0.2 µm • Power consumption < 0.5 mW • Aperture > 15 mm • Nominal Optical Pathlength Difference • 12.5 mm for type A (channels 3,4 and 5) • 20.8 mm for type B (channels 6-low and 6-high) MECHANISMS W. Aalders

  15. Translation principle MECHANISMS W. Aalders

  16. DRT Layout MECHANISMS W. Aalders

  17. Monolithic Roof top mirror MECHANISMS W. Aalders

  18. Roofmirror Fabrication Tool MECHANISMS W. Aalders

  19. DRT-QM#1 MECHANISMS W. Aalders

  20. Detail MECHANISMS W. Aalders

  21. Hysteresis without ringing Sigma= 89.9 nm, FWHM=211.7 nm MECHANISMS W. Aalders

  22. Hysteresis with ringing Sigma= 63.4 nm, FWHM=149.2 nm MECHANISMS W. Aalders

  23. Mechanisms QM and FM schedule MECHANISMS W. Aalders

  24. DRT-QM AIV Schedule MECHANISMS W. Aalders

  25. DRT QM’s • Production Documents complete • Manufacturing complete • Assembly 90% finished • Alignment (TPD) August • Test Programme on time • Delivery Dec. 2003 on time MECHANISMS W. Aalders

  26. DRT FM & SFM AIV Schedule MECHANISMS W. Aalders

  27. DRT FM • Parts production put out • Assembly Aug/Sep 2003 • Test equipment adaptations • Testing on time • Delivery on time MECHANISMS W. Aalders

  28. FPC QM • Model (re)design complete • Manufacturing drawings • Manufacturing put out • Assembly is late • Test equipment adaptation • Qualification testing is late • Delivery is late MECHANISMS W. Aalders

  29. Flexible PIVOT Development HIFI

  30. Strength [N] Fatigue resistance [N] Torque rate [N.mm/rad] Launch survival Life time, cycles Power and response time Pivot requirements MECHANISMS W. Aalders

  31. Pivot Construction MECHANISMS W. Aalders

  32. Pivot Buckling MECHANISMS W. Aalders

  33. Pivot development (1) History • TRW-Lucas Bendix Chromium steel std • Used in balloon and ISO instruments • Deemed risky for crystalline structure • Inconel Bendix Specials • Little guarantees for quality • Too expensive MECHANISMS W. Aalders

  34. Pivot developments (2) • Developments of other parties • BE-systems (CNES, LAM): inadequate • Zeiss monolithic CuBe: inadequate • SRON’s own development • Monolitic SS-304 version: abandoned • C-Flex • CuBe welded/brazed • Inconel brazed/brazed MECHANISMS W. Aalders

  35. TC-1 MECHANISMS W. Aalders

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