Home » Airborne Measurements » O2/N2 Ratio
O2/N2 Ratio
STATUS
Operational, Ongoing Improvements
AVAILABILITY
This instrument is currently available for collaborative projects on a resource recovery basis.
REQUEST PROCEDURE
Contact PI Britt Stephens to discuss possible collaborations.
Airborne Measurements
The NCAR Airborne Oxygen Instrument measures O2 concentration using a Vaccuum-ultraviolet absorption technique.
CONTACT
Britton Stephens
NCAR EOL/TIIMES
1850 Table Mesa Dr. Boulder, CO 80305
303-497-1018
stephens@ucar.edu
http://www.eol.ucar.edu/~stephens
SPECIFICATIONS
ManufacturerBritton Stephens
Dimensions19" rack wide X 30" tall X 22" deep plus a 6" diameter X 14" tall dewar
Weight200 lbs.
Power Source Type110 AC
Inlet Aperturesrequires 1/4" aft facing inlet
Heating/Cooling Requirementsnone
Airspeed/Altitude Requirementsmax. alt 60,000 feet
Operators Required0-1
Ground Requirements30 minute preflight
Suitable PlatformsNCAR GV, C130 Wyoming King Air
Data SystemPC104 based PC running Windows XP Instrumentation control with Visual Basic Instrument control via ethernet Data download via ethernet or USB
Measured ParameterAtmospheric O2/N2 Ratio
Measurement TechniqueVacuum Ultraviolet Absorption
Operational ModeContinous sampling
Time Resolution0.5 Hz
Horizontal Resolution250 m at 250 kts
Other Resolutionraw data rate is 10 Hz
Precision4 per meg 1 sigma in 2 seconds
Accuracy+/- 5 per meg
Range+500 to -1000 per meg on Scripps O2 Scale
Calibration Method4 high pressure cylinders inside instrument, high span and low span analyzed every 30 minutes
Limitationsnone
REFERENCES
Stephens, B.B., R.F. Keeling, and W.J. Paplawsky, Shipboard measurements of atmospheric oxygen using a vacuum-ultraviolet absorption technique, Tellus Series B, 55, 857-878, 2003.
REMARKS
Instrument flew on the Wyoming King Air in ACME-07 and will fly on NCAR GV on START-08 and HIPPO.
UPDATED ON
23 Sep 2009 20:35