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
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Related Subjects
AIR POLLUTION MONITORS
OPTICAL RADAR
COMPLEX TERRAIN
ATMOSPHERIC CHEMISTRY
BACKSCATTERING
CARBON DIOXIDE LASERS
CHEMICAL ANALYSIS
FOURIER ANALYSIS
GAS ANALYSIS
PLUMES
REFLECTION
SPATIAL DISTRIBUTION
SULFUR FLUORIDES
SURFACE ENERGY
SURFACES
CHEMISTRY
DISTRIBUTION
ENERGY
FLUORIDES
FLUORINE COMPOUNDS
FREE ENERGY
GAS LASERS
HALIDES
HALOGEN COMPOUNDS
LASERS
MEASURING INSTRUMENTS
MONITORS
PHYSICAL PROPERTIES
RADAR
RANGE FINDERS
SCATTERING
SULFUR COMPOUNDS
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)