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Expandable Seafloor Observatory

The Expandable Seafloor Observatory (OBSEA) is a versatile underwater research facility designed for studying geology, geophysics, biology, meteorology, physical processes, and water quality. It features a expandable system architecture, with a power supply, data management software, and a variety of oceanographic instruments. The data collected can be accessed in real-time or historically through a web browser or custom application.

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Expandable Seafloor Observatory

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  1. Expandable Seafloor Observatory OBSERVATORIO SUBMARINO EXPANDIBLE

  2. Main Research Fields Geology Geophysics Biology Meteorology Physical Processes Water Quality

  3. System architecture Power Supply • Land Station up to 1500Vdc • Node Power Supply 300Vdc • Attached DC/DC converter 1500 to 300 Vdc • Oceanographic Instruments 12 or 48 Vdc 1 2 • Marine Hybrid cable: • Copper tube at -1500Vdc (neg) • Aluminum screen at 0Vdc (pos) parallel connection to ground OBSEA – Expandable Seafloor Observatory

  4. Data Management Software Diagram • Instruments transmit under UDP protocol • Non-permanente data storage at the main node • User and equipment configuration are stored in a Database • Data is stored in a database at the land station • Historical data through Internet with a web browser • Real Time Data through custom application or Telnet OBSEA – Expandable Seafloor Observatory

  5. System architecture / Oceanographic Sensors Initial Prototype • First instruments: • CTD (SBE 37 SMP) • IP Camera (PIV 6732) • Hydrophone (Bjørge Naxys Ethernet 02345) Maintenance: Every 6 months OBSEA – Expandable Seafloor Observatory

  6. System architecture / Oceanographic Sensors Complete Node • Possible future instruments • Long period seismometer (Mark products LTD-4-3D) • Short period Ocean Bottom Seismometer (OBS) • CO2 sensor OBSEA – Expandable Seafloor Observatory

  7. System architecture Control Diagram • Autonomous Controller with microCLinux • SNMP communication with Ground Station • Constant monitoring of power, currents, temperatures, etc • Power control of individual components and external ports • Ground supervision, maintenance and emergency control OBSEA – Expandable Seafloor Observatory

  8. Structure design / Operation and maintenance Top view Physical Structure Side view • Designed for deployment at low depth (diver assisted) • Protection for the main node • Easy to transport and install OBSEA – Expandable Seafloor Observatory

  9. Structure design / Operation and maintenance Physical Structure • Designed for 300 meters depth • Free space for future developments • Up to 8 instrument ports • 2 ports for trunk cable connection • One subrack for 16 100 x 160mm PCB cards • 150 watt redundant 1+1 power suply at 48Vdc • 100 watt redundant 2+1 power supply at 12Vdc • 1+1 redundant gigabit ethernet switch Main Cylinder OBSEA – Expandable Seafloor Observatory

  10. Structure design / Operation and maintenance • 5 kilometers of marine cable from Telefonica • 1,5 kilometers of land optical cable from Telefonica • 1,5 kilometers of land electrical cable from Prysmian • Land installation by Abentel in june’08 • Marine installation to be done by Tyco Marine Marine Cable Land Cable OBSEA – Expandable Seafloor Observatory

  11. OBSEA Location Possible nodes in the protected area OBSEA – Expandable Seafloor Observatory

  12. Contributions • OBSEA observatory can be used as a test-bed for demo-mission sensors • Integration of sensor interfaces based on the IEEE 1451.2 and Puck . • Calibration of sensors before deployment as a certified lab by ISO/IEC 17025 norm.

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