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BepiColombo MMO Payload Mercury Dust Monitor (MDM)

BepiColombo MMO Payload Mercury Dust Monitor (MDM). MMO Science Working Sub-Group Meeting At Kyoto Univ. 22 March 2006. Mg Frame. PZT. PZT. PZT. PZT. Metal (Mg) frame of the PZT sensor (same as the flight model). ( 5 cm x 5 cm) x 4 plates of PZT fixed in the frame.

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BepiColombo MMO Payload Mercury Dust Monitor (MDM)

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  1. BepiColombo MMO PayloadMercury Dust Monitor(MDM) MMO Science Working Sub-Group Meeting At Kyoto Univ. 22 March 2006 BepiColombo Mercury Dust Monitor ( MDM )

  2. Mg Frame PZT PZT PZT PZT Metal (Mg) frame of the PZT sensor(same as the flight model) BepiColombo Mercury Dust Monitor ( MDM )

  3. (5cmx5cm)x4 plates of PZT fixed in the frame BepiColombo Mercury Dust Monitor ( MDM )

  4. New big chamber on the dust beam line at HIT accelerator Dust beam 700 mm sensor BepiColombo Mercury Dust Monitor ( MDM )

  5. (5cmx5cm)x4 plates of PZT in the chamber BepiColombo Mercury Dust Monitor ( MDM )

  6. Installation of MDM and heat flow To be fixed * How to fix the 4 cables. * connector * hole size * cable length (< 20 cm ) * insulator and heat conductor BepiColombo Mercury Dust Monitor ( MDM )

  7. Output voltage of the PZT Output electrode Output electrode Local sensitivity of the 5cm sq. PZT Exited points by the needle. BepiColombo Mercury Dust Monitor ( MDM )

  8. 50 mm ① ② ６ ③ ２ １ ビーム ④ ４ ２ Typical signals from different part of the PZT Iron particle: 2.56km/s 45.7pg Green/PMT, Blue/③,Red/② To be fixed : optimum electrode and PZT size BepiColombo Mercury Dust Monitor ( MDM )

  9. Momentumvs.Output Vp( different area of the PZT ) Vp ( mV ) Momentum ( pg km/s ) BepiColombo Mercury Dust Monitor ( MDM )

  10. Amp1 (Clear Pulse) Amp2 (Ampteck) Output by different types charge sensitive amplifier ( to be fixed ) Output Vp (mV) Momentum ( pg km/s ) BepiColombo Mercury Dust Monitor ( MDM )

  11. High temperature endurance test of PZT、 ２００℃、 ２５ｄａｙｓ BepiColombo Mercury Dust Monitor ( MDM )

  12. Category I Category III 5.1km/s 19pg (A) (D) 20km/s 36fg (C) (B) 6.3km/s 7.0pg 8.4km/s 4.5pg Category II Change of the signal shape with impact velocity BepiColombo Mercury Dust Monitor ( MDM )

  13. PZT Thickness Rise time vs. velocity of single peaked pulseHigh speed impact ( > 8 km/s ) BepiColombo Mercury Dust Monitor ( MDM )

  14. Restructured signal form with different frequency range Original output shape High frequency comp. Low frequency comp. BepiColombo Mercury Dust Monitor ( MDM )

  15. おわり( End )10 min BepiColombo Mercury Dust Monitor ( MDM )

  16. Now checking the thermal resistance of the using parts. －200 ℃ ～250 ℃ Piezo electric sensor Sensitivity Long time stability Flexible insulation material Experiment using the Dust accelerator at Max Plank Institute, Germany 4 weeks at November 2005 Present status BepiColombo Mercury Dust Monitor ( MDM )

  17. Result of thermal analyses 10cm ●PZT Sensor 100 cm2 5cm x 5cm x1 mm, 4Plates ●Solar Radiation 14 kW/m2 10 x Solar Constant ●PZT Thermal constant Surface metal plate (Ag) ●Mg Frame ( white paint ) α=0.2, ε=0.8 ●Thermal conductivity (W/mK) PZT: 1.0, Frame: 43.6 PZT PZT PZT PZT Mg Frame BepiColombo Mercury Dust Monitor ( MDM )

  18. MDM master schedule BepiColombo Mercury Dust Monitor ( MDM )

  19. 電極４ 電極３ 電極２ 電極１ Local sensitivity of the PZT(Mechanically Exited) 5cm 5cm BepiColombo Mercury Dust Monitor ( MDM )

  20. Momentum vs. velocity from the restructured signal ( high frequency ) velocity ( km/sec ) momentum ( pg km/sec ) BepiColombo Mercury Dust Monitor ( MDM )

  21. Rise time vs. velocity from the restructured signal ( Low frequency ) Rise time ( n sec ) Velocity ( km/sec ) BepiColombo Mercury Dust Monitor ( MDM )

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