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Modular Design for Next-Gen Ocean Acidification Research Using xFOCE

This document outlines the modular design of the xFOCE testbed for studying ocean acidification. Utilizing readily available materials like Schedule 40 PVC pipe, the system is adaptable to various habitats and is fully documented. Key components include a central Gateway Node for data collection and dissemination, sensor nodes for modular instrumentation, and software that manages data and control loops. Moreover, the project aims to provide real-time calculations and data accessibility through an open-source platform. Funded by the David and Lucile Packard Foundation, the research is expected to progress significantly by 2014.

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Modular Design for Next-Gen Ocean Acidification Research Using xFOCE

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  1. xFOCE Update W. J. Kirkwood 19 NOV 2013

  2. Using swFOCEas xFOCEtestbed

  3. Modular design adaptable to habitat fully documented

  4. Mechanical Design • Schedule 40 PVC pipe standard irrigation piping available almost anywhere • Van-Stone flanges glued to pipe, standard pipe flanges • Gaskets also purchased or can be made on site from sheet • End caps either manufactured from bulk PVC or purchased

  5. Step by Step Instructions being documented Instructions include thermal calc spreadsheet

  6. Basic Architecture • Diver serviceable ocean acidification platform • Perfect candidate for modular concept • Large number of scientific instruments • Housings easy to swap in-situ • Central Node • Feeds 2 swFOCE chambers

  7. Gateway Node • Modular controller which: • Collects data from subsea instrumentation. • Disseminates data to shore station and peer nodes. • Acts as the central computer in experimental control loop

  8. Gateway Node: Electrical Design • Uses BeagleBone as central computer • Load switching & serial communication to four Sensor Nodes • Seawater ground fault measurement • Power monitoring for each Sensor Node

  9. Sensor Node • Modular instrument interface • Serial & power expansion for multiple instruments • Easy to fabricate and inexpensive

  10. Sensor Node: Electrical Design • Four science ports • Voltage/power user selectable • Three serial outputs • 4-20mA option • Individual load switching & power monitoring

  11. Sensor Node: Mechanical Design • Simple, inexpensive housing • Filled with potting compound • No connectors, use whips instead

  12. Gateway Node: Software Design • Supervisor module oversee all functions • Sampling modules • Collect data • Control modules • Maintain specific pH within test chamber • Distribution modules • Disseminates collected data The same basic software is used for each element

  13. Work to adapt MBARI’s Open Source Data System starting

  14. Other Tools Tools for CO2 use, pH offset and tau I’ve considered Python to make the calcs real time on the webpage. The Excel file is available now on request. We need to document further for the open source download.

  15. Other Tools Control script modeling available Currently in MATLAB Wondering if Excel is worth doing or some other language? I’ve considered Python to make the calcs real time on the webpage.

  16. Website is available We expect to have the majority of this in place for 2104 Acknowledgements: Funding for xFOCE provided by the David and Lucile Packard Foundation

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