FPU CDR HIFI 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; • 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
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
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
FPC Layout (DM) MECHANISMS W. Aalders
FPC Layout (DM) MECHANISMS W. Aalders
FPC Layout (DM) MECHANISMS W. Aalders
FPC Layout (DM) MECHANISMS W. Aalders
TESTS (on FPC-DM) • Performance (@ RT) • Angle vs current • Angle vs time • Vibration response(@ RT) • Cryo-performance • Health check MECHANISMS W. Aalders
Rotation vs current MECHANISMS W. Aalders
Rotation vs time MECHANISMS W. Aalders
Vibration response (FPC DM) MECHANISMS W. Aalders
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
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
Translation principle MECHANISMS W. Aalders
DRT Layout MECHANISMS W. Aalders
Monolithic Roof top mirror MECHANISMS W. Aalders
Roofmirror Fabrication Tool MECHANISMS W. Aalders
DRT-QM#1 MECHANISMS W. Aalders
Detail MECHANISMS W. Aalders
Hysteresis without ringing Sigma= 89.9 nm, FWHM=211.7 nm MECHANISMS W. Aalders
Hysteresis with ringing Sigma= 63.4 nm, FWHM=149.2 nm MECHANISMS W. Aalders
Mechanisms QM and FM schedule MECHANISMS W. Aalders
DRT-QM AIV Schedule MECHANISMS W. Aalders
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
DRT FM & SFM AIV Schedule MECHANISMS W. Aalders
DRT FM • Parts production put out • Assembly Aug/Sep 2003 • Test equipment adaptations • Testing on time • Delivery on time MECHANISMS W. Aalders
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
Flexible PIVOT Development HIFI
Strength [N] Fatigue resistance [N] Torque rate [N.mm/rad] Launch survival Life time, cycles Power and response time Pivot requirements MECHANISMS W. Aalders
Pivot Construction MECHANISMS W. Aalders
Pivot Buckling MECHANISMS W. Aalders
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
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
TC-1 MECHANISMS W. Aalders
