Development and demonstration of ALARM (airborne lidar agent remote monitor). Final report
An airborne wavelength-tunable CO/sub 2/ differential absorption lidar (DIAL) capable of making simultaneous measurements of atmosphe4ric backscatter and surface-reflected energy was developed and tested in a series of experiments. A data base of surface returns for a flight track that passed over ocean, farmland, urban, forest and grassland surfaces was collected for various lidar wavelengths and wavelength separations. The data show that highest correlation between two-wavelength surface returns occurs over land surfaces and the highest decorrelation over ocean surfaces-the DIAL sensitivity for detection of chemical agents based on surface returns is significantly better over land than ocean areas. The data also show that the highest decorrelation is associated with the highest reflectivity surfaces of ocean and urban areas, probably a result of specular reflection. The correlation of surface returns decreases with increasing wavelength separation over land areas but is nearly independent of wavelength separation over ocean areas. The airborne DIAL system was demonstrated for mapping the cross-plume gas concentration distribution resulting from a near-surface release of SF/sub 6/. A new Fourier-analysis method was used to improve single pulse-pair signal-to-noise ratios.
- Research Organization:
- SRI International, Menlo Park, CA (USA). Atmospheric Science Center
- OSTI ID:
- 7167342
- Report Number(s):
- AD-A-172886/4/XAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Airborne LIDAR mapping of SF/sub 6/ concentration distributions for transport and diffusion studies. [ALARM]
Development of an airborne lidar for characterizing particle distribution in the atmosphere. Final report
Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION MONITORS
ATMOSPHERIC CHEMISTRY
BACKSCATTERING
CARBON DIOXIDE LASERS
CHEMICAL ANALYSIS
CHEMISTRY
COMPLEX TERRAIN
DISTRIBUTION
ENERGY
FLUORIDES
FLUORINE COMPOUNDS
FOURIER ANALYSIS
FREE ENERGY
GAS ANALYSIS
GAS LASERS
HALIDES
HALOGEN COMPOUNDS
LASERS
MEASURING INSTRUMENTS
MONITORS
OPTICAL RADAR
PHYSICAL PROPERTIES
PLUMES
RADAR
RANGE FINDERS
REFLECTION
SCATTERING
SPATIAL DISTRIBUTION
SULFUR COMPOUNDS
SULFUR FLUORIDES
SURFACE ENERGY
SURFACE PROPERTIES
SURFACES
THERMODYNAMIC PROPERTIES