The Automatic Geophysical Observatories Will Rachelson – UC Berkeley Jeff Chang – Stanford Alec Plauche – UC Berkeley Polar Technology Conference – 2007.04.25.

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Presentation transcript:

The Automatic Geophysical Observatories Will Rachelson – UC Berkeley Jeff Chang – Stanford Alec Plauche – UC Berkeley Polar Technology Conference –

AGO Overview AGO Locations Site Layout Science Instrumentation Power System Current Status

AGO Locations

Site Layout / Instrumentation

Science Instrumentation 1.Allsky Camera 2.Data Acquisition Unit 3.Iridium Comms 4.VLF 5.Fluxgate Magnetometer 6.Imaging Riometer 7.LF/HF 8.Searchcoil Magnetometer

Power System Top Level Diagram Design Requirements Novel Components –AWP Wind Turbine –System Architecture –Linear Voltage Regulators / Heaters Specifications

Power System – Top Level

Power System Requirements Must operate with battery fault: short/open Must operate when sun up, regardless of battery condition or wind Must operate unattended Must not damage instrumentation in fault conditions Maintain temp > -40C Supply 30V

Power System – Top Level 2

African Wind Power m 2 Swept Area 24V, 23mph Low cut-in speed (~6mph) No slip-rings or brushes Indestructible Cheap ($2500 USD) Hard to acquire

AWP Alternator survives falls Blades don’t

Voltage Regulators 30Vdc Regulated output 1500 Watts Max Switched between 3 locations: –Rack –Hut –Outside 15 IRFP250 FETs, 300W per heatsink

Voltage Regulators

Power System Control cr10x-based Simple state machine Duties: –Switch Heat –Turn on/off Instruments cr10x with housekeeping and instrument power connectors

AGO Status

Power System Specifications Solar Panels: 4x Kyocera 120W 12V Wind: AWP 3.6 Turbine, 1kW 24V, 20’ tower Batteries: 4x Sun Xtender AGM PVX-2120L, 212Ah 12V Sealed Lead Acid Power Controller: Campbell Scientific cr10x Charge Control: Morningstar Tristar TS-60 Battery LVD: Morningstar Sunsaver 24V Comms: Iridium (h/k + science), ARGOS (h/k only)

Contacts AGO Engineering: –Will Rachelson – –Alec Plauche – –Jeff Chang – AGO P.I.: –Al Weatherwax – Status Plots: Web page: AGO Photos: