IPPW-6 Instrument Accommodation on the Pioneer Venus and Galileo Probes Bernie Bienstock Jet Propulsion Laboratory California Institute of Technology 24.

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Presentation transcript:

IPPW-6 Instrument Accommodation on the Pioneer Venus and Galileo Probes Bernie Bienstock Jet Propulsion Laboratory California Institute of Technology 24 June 2008

IPPW-6 2 General Instrumentation Accommodation Requirements (1) Most instruments require “normal” housekeeping support from probe subsystems –Power –Thermal control –Telemetry and command functions Entry probes, with in-situ instrumentation, require additional support that may include some or all of the following services –Field-of-view through windows –Atmospheric ingestion and expulsion –Dynamic / static mounting requirements –Deployments –Magnetic cleanliness –Outgassing and contamination control –EMI/EMC analysis –Microphonics

24 June 2008IPPW-6 3 General Instrumentation Accommodation Requirements (2) Instrument accommodation complexity is driven by probe design philosophy –Pressurized probes, such as the Pioneer Venus Large and Small Probes, require the probe pressure vessel itself to provide the viewing and sampling access for the instruments –A “vented” probe, such as the Galileo probe, allows instruments to incorporate external atmospheric sampling and viewing within the instrument With any entry probe design, instrument accommodation requires a continuing, design coordination between the probe science PI(s) and the probe engineers

24 June 2008IPPW-6 4 Pioneer Venus Large Probe Design Pressure Vessel –79 cm diameter Aeroshell –142 cm diameter –45º blunt cone Aft Cover Pressure Vessel Module Heat Shield / Aeroshell Module

24 June 2008IPPW-6 5 Pioneer Venus Small Probe Design Pressure Vessel –47 cm diameter Aeroshell –76 cm diameter –45º blunt cone Atmospheric Structures Instrument Sensors Net Flux Radiometer Sensor Nephelometer Windows Heat Shield / Aeroshell Module Pressure Vessel Module

24 June 2008IPPW-6 6 LIR LSFR LCPS LNMS LGCLGC LGC LSFR LN LCPS LIR LAS Electronics LSFR Sensor LASAtmospheric structures LN Nephelometer LCPS Cloud particle size spectrometer LIR Infrared radiometer LNMS Neutral mass spectrometer LGC Gas chromatograph LSFR Solar flux radiometer Descent Pioneer Venus Large Probe Instruments Shelves 65 cm diameter

24 June 2008IPPW-6 7 SN SAS SNFR SN SAS SAS Atmospheric structures SN Nephelometer SNFRNet flux radiometer Descent Pioneer Venus Small Probe Instruments Shelves 39 cm diameter

24 June 2008IPPW-6 8 Pioneer Venus Window Summary

24 June 2008IPPW-6 9 Large Probe LSFR Window BRAZE ELECTRON BEAM WELD AND GOLD PLATE

24 June 2008IPPW-6 10 Large Probe LIR Window BRAZE ELECTRON BEAM WELD AND PLATE INSTALL TEMP SENSOR TITANIUM FASTNER (8 PL) SHEAR PIN (2 PL) WINDOW ASSY GRAFOIL GASKET TITANIUM PRESSURE VESSEL

24 June 2008IPPW-6 11 Large Probe Pressure Inlet

24 June 2008IPPW-6 12 Galileo Probe Major Elements Descent Module –66 cm diameter Aeroshell –126 cm diameter –45º blunt cone

24 June 2008IPPW-6 13 NFR HAD Interferometer HAD Electronics ASI Electronics LRD Electronics NEP Sensor NEP Electronics NMS HAD Interferometer HAD Electronics LRD Electronics ASI Electronics NMS Galileo Probe Instruments ASIAtmospheric structures inst NEPNephelometer HADHelium abundance detector NFRNet flux radiometer NMS Neutral mass spectrometer LRD Lightning and radio emission detector EPI Energetic particle instrument LRD Sensor HAD Inlet

24 June 2008IPPW-6 14 Conclusions Probe instrument accommodation requires a close working relationship between the PI(s), instrument designers and probe engineering team Early definition of mechanical interfaces is critical Key considerations are instrument accommodation and integration Extremely limited probe resources drive innovative solutions to resolve tough problems Future probe mission success must leverage lessons learned from past missions