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Innovative Methane Detection on the Seafloor: Contros HydroC Methane Sensor MC118 Overview

Presented by Ken Sleeper from the Seabed Technology Research Center, the Contros HydroC Methane Sensor MC118 is designed for direct measurement of methane concentrations on the seafloor. This presentation highlights the need for deploying advanced sensors like the Contros sensor that utilizes membrane diffusion and IR absorption techniques. The June 2010 MC118 cruise tested various configurations and operational efficiencies. Future directions include enhanced AUV surveys and improvements in sensor development for rapid response and lower detection levels, supported by NOAA and other institutions.

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Innovative Methane Detection on the Seafloor: Contros HydroC Methane Sensor MC118 Overview

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  1. Contros HydroCMethane Sensorat MC118 Presented by Ken Sleeper Seabed Technology Research Center Mississippi Mineral Resources Institute University of Mississippi October 26, 2010

  2. Why Contros • Need for a direct measure of methane on the seafloor • PFA, BBLA, CSA and future arrays • Raman Spectrometer, METS sensor, Mid-IR and Mass Spectrometer • Evaluate new near-IR detector • Chris Martens’ METS shoot out – Survey Mode • Rich Camilli redesign of the power draw – Observatory Mode

  3. Contros near IR CH4 sensor Key Features • Membrane Diffusion • Partial Pressures (Henry’s Law) • IR absorption bands of Methane • Concentration • Pressure • Temperature • Relative Humidity

  4. June 2010 MC118 Cruise • 15 CTD CASTS with CDOM and Transmissometer • 5 Casts with the Contros • 3 with pump cowling • 1 with no pump cowling • 1 with pump operational • 3 with bottles & GC work • 4 separate Mass Spec casts

  5. CTD Cast 13 With CDOM & O2

  6. Detection Chamber Readings • Control Temperature • Gas Temperature • Pressure • Relative Humidity • Raw electrical signal

  7. CAST 13 Raw Voltage Output

  8. Depth Profile – Cast 13IR raw output Down Cast UP Cast

  9. Depth ProfilesMass Spec Casts Cast 1 Cast 2 Cast 3

  10. Future Directions • AUV Surveys • Mid-Atlantic Ridge • Geochemical Array - BBLA • Duty cycle vs reconfigure power draw • Post deployment follow up • Sensor development • Shorten response time • Lower detection levels

  11. Funding for this project is generously provided by NOAA/OER, NIUSTDOI/BOEMRE (MMS)andDOE/NETL Special thanks to Andy Gossett, Matt Lowe, Brian Noakes, Larry Overstreet and the crew of the Pelican for handling the at-sea operations of the equipment

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