contros hydroc methane sensor at mc118
DESCRIPTION
Contros HydroC Methane Sensor at MC118. Presented by Ken Sleeper Seabed Technology Research Center Mississippi Mineral Resources Institute University of Mississippi October 26, 2010. Why Contros. Need for a direct measure of methane on the seafloor PFA, BBLA, CSA and future arrays - PowerPoint PPT PresentationTRANSCRIPT
1
Contros HydroCMethane Sensor
at MC118
Presented by Ken SleeperSeabed Technology Research Center
Mississippi Mineral Resources InstituteUniversity 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
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CTD Cast 13With CDOM & O2
6
9:58:39 10:03:5910:09:1810:14:3810:19:5810:25:1810:30:380
0.5
1
1.5
2
2.5
3
3.5
4
62310 Cast 11Concentration µmol/L
Concentration µmol/L
10:49:4810:55:0811:00:2811:05:4811:11:0811:16:2811:21:4811:27:0811:32:280
0.5
1
1.5
2
2.5
3
62310 Cast 12Concentration µmol/L
Concentration µmol/L
7
13:15:08 13:17:48 13:20:28 13:23:08 13:25:48 13:28:28 13:31:08 13:33:48 13:36:28 13:39:08 13:41:48 13:44:28 13:47:08 13:49:48 13:52:28 13:55:080
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
062410 cast 13Concentration µmol/L
Concentration µmol/L
8
13:15:0813:19:2313:23:3813:27:5313:32:0813:36:2313:40:3813:44:5313:49:0813:53:23900
950
1000
1050
1100
1150Pressure
TIME (hr:min:sec)
Pres
sure
(mba
r)
13:12:00 13:19:12 13:26:24 13:33:36 13:40:48 13:48:00 13:55:12 14:02:2425
27
29
31
33
35
37
39
41
Gas Temperature (°C)
CH4-0510-006 CH4-0510-006 T_gas °C
Tem
pera
ture
Time (hr:min:sec)
13:12:00 13:19:12 13:26:24 13:33:36 13:40:48 13:48:00 13:55:12 14:02:240
10
20
30
40
50
60
70Relative Humidity (rh%_gas%)
CH4-0510-006 CH4-0510-006 %rH_gas %
Rela
tive
Hum
idity
(%)
Time (hr:min:sec)13:15:0813:19:0313:22:5813:26:5313:30:4813:34:4313:38:3813:42:3313:46:2813:50:2313:54:18
00.20.40.60.8
11.21.41.61.8
2
062410 cast 13Concentration µmol/L
Concentration µmol/L
Time (hr:min:sec)
Conc
entr
ation
13:15:0813:19:2313:23:3813:27:5313:32:0813:36:2313:40:3813:44:5313:49:0813:53:2339.2
39.4
39.6
39.8
40
40.2
40.4
40.6
40.8
41Control Temperature (°C)
Time (hr:min:sec)
Tem
pera
ture
(°C)
Detection Chamber Readings• Control Temperature• Gas Temperature• Pressure• Relative Humidity• Raw electrical signal
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CAST 13 Raw Voltage Output
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Depth Profile – Cast 13IR raw output
Down Cast UP Cast
Depth ProfilesMass Spec Casts
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Cast 1 Cast 2 Cast 3
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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
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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