Home » Airborne Measurements » NASA LaRC Airborne UV DIAL
NASA LaRC Airborne UV DIAL
STATUS
Operational
AVAILABILITY
Currently Available
REQUEST PROCEDURE
Contact PI via letter or email
Airborne Measurements
The NASA Langley Airborne Differential Absorption Lidar (DIAL) system uses four lasers to make simultaneous DIAL O3 profile measurements in the ultraviolet and lidar aerosol backscatter profile measurements at visible and infrared wavelengths. The NASA airborne DIAL system has been used in 28 major field experiments over the past 27 years to investigate regional- and global-scale processes related to tropospheric and stratospheric O3 and aerosols. The DIAL system generates six laser beams, and four laser beams at 289, 300 , 600, and 1064 are then simultaneously transmitted into the atmosphere above and below the aircraft. The UV DIAL wavelengths are selectable to optimize the range and sensitivity of the O3 measurements depending on the emphasis of the campaign. The aerosol and cloud measurements are made with the 600 nm and at 1064 nm wavelengths. The nadir and zenith receivers also have polarization beamsplitters for simultaneously detection of the aerosol and cloud depolarization.
CONTACT
Johnathan Hair
NASA Langley Research Center
NASA LaRC MS401A Hampton VA., 23681
757-864-1406
Johnathan.W.Hair@nasa.gov
SECONDARY CONTACT
Syed Ismail
NASA Langley Research Center
MS 401A NASA Langley Research center Hampton, VA 23681
757-864-2719
syed.Ismail-1@nasa.gov
http://esto.nasa.gov/conferences/ESTC2006/papers/b9p3.pdf
SPECIFICATIONS
ManufacturerNASA LaRC
Dimensions” x 40” x 43” (plus data rack) (does not include telescope height)
Weight2521 (includes instrument and data rack)
Power Source Type10kW (400Hz and 60Hz)
Inlet Apertures16 inch diameter Fused Silica window
Heating/Cooling RequirementsLaser Chiller Unit
Airspeed/Altitude Requirements
Operators Required3
Ground Requirements
Suitable PlatformsDC8, P3, C130
Data SystemStandard double data rack, real time display.
Measured ParameterOzone Mixing Ratio, aerosol backscatter ratio (2 wavelengths), aerosol depolarization ratio (1 wavelength), aerosol wavelength dependence
Measurement TechniqueDIAL, standard aerosol backscatter lidar
Operational ModeSimultaneous Nadir and Zenith
Time ResolutionOzone 3 min., Aerosols 2 sec. (typical)
Horizontal ResolutionTime Resolution x aircraft speed (25km typical)
Other ResolutionOzone Vertical: 300m (typical), Aerosol Vertical (30-60m)
Precision5%
Accuracy5-10%
Range0-25 km (typcial - depends on wavelength selection)
Calibration MethodInternal
LimitationsNear field measurements are gated and cloud attenuation
REFERENCES
Browell, E. V., et al., NASA multipurpose airborne DIAL system and measurements of ozone and aerosol profiles, Appl. Opt., 22, 522-534, 1983. Browell, E. V., Differential absorption lidar sensing of ozone, Proc. of the IEEE, 77, 419-432, 1989. Richter, D. A., et al., Advanced airborne UV DIAL system for stratospheric and tropospheric ozone and aerosol measurements, in Adv. in Atmospheric Remote Sensing, A. Ansmann, R. Neuber, P. Rairoux, and U. Wandinger, eds., Springer-Verlag, Berlin, 395-398, 1997. Browell, E. V., S. Ismail, and W. B. Grant. Differential absorption lidar (DIAL) measurements from air and space, Appl. Phys. B, 67, 399-410, 1998.
UPDATED ON
3 Sep 2009 13:47