Results 201 to 210 of about 2,376 (230)
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Laser prf considerations in differential absorption lidar applications
Applied Optics, 1983Laser pulse repetition frequency (prf) is a major factor in determining the performance of differential absorption lidar (DIAL) systems. The effects of laser prf on concentration measurement accuracy and maximum usable range are quantified. Heterodyne-detection (coherent) and direct-detection (noncoherent) as well as path-averaged and range-resolved ...
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Multiple wavelength differential absorption lidar evaluation
Acta Physica Hungarica, 1984Algorithms are shown for the interpretation and evaluation of multiple wavelength differential absorption lidar data for cases when only limited information is available about the molecular components present prior to the measurement. Experimental data are modeled by computer simulation of measurement, errors and reliability of the measurements are ...
T. I. Tarnóczi, P. Richter
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Numerical simulation for differential absorption lidar system
SPIE Proceedings, 2007In the recent years, the most country in the word attach importance to the environmental and the protection of environmental doubly. The differential absorption lidar (DIAL)operating in the infrared wavelengths is a powerful standoff sensor for rapid remote detection of chemical emissions.
WeiRan Wang, ShiRong Yin
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Differential Absorption Lidar Measurements of Tropospheric Ozone
Laser Applications to Chemical Analysis, 1994Ozone is one of the most important trace species in the atmosphere and the focus of several important environmental issues. Most ozone resides in the stratosphere where it plays a critical role in protecting the biosphere from harmful solar ultraviolet radiation.
Andrew O. Langford, Michael H. Proffitt
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Infrared Differential Absorption Lidar for Vapor Detection
1988Abstract : Ground-mobile and airborne carbon dioxide laser systems were developed to measure vapor clouds using differential absorption lidar (DIAL) techniques. Field testing with the ground-mobile lidar detected a vapor cloud at 7 km using the return signal from a topographic target at a range of 8.5 km.
P. L. Holland +4 more
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Probing Air Pollutants by Differential Absorption LIDAR
1992Air pollution is related with numerous different physical, chemical and meteorological phenomena. So, the atmospheric equilibrium depends on hundreds of chemical species, but only few of them are directly emitted and considered as main pollutants. All the others are trace constituents, being nevertheless of outstanding importance for the chemical ...
H. J. Kölsch +3 more
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Infrared differential absorption Lidar (DIAL) measurements of hydrocarbon emissions
Journal of Environmental Monitoring, 2011We report the application of an infrared (IR) differential absorption Lidar (DIAL) system (also capable of ultra violet measurements) built at the National Physical Laboratory (NPL), UK, to field measurements of total site emissions (controlled and fugitive) from petrochemical and landfill installations.
Rod, Robinson +4 more
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Range-resolved differential absorption lidar: optimization of range and sensitivity
Applied Optics, 1985A practical range-resolved differential absorption and scattering lidar has been optimized for maximum range and sensitivity. Compression of the signal amplitude dynamics, quasi-simultaneous dual-pulse operation, the processing sequence of the primary signals, a method of alignment mismatch compensation, and the effects of temporal and spatial ...
W, Staehr, W, Lahmann, C, Weitkamp
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Differential absorption lidar technique for measurement of the atmospheric pressure profile
Applied Optics, 1983A new two-wavelength lidar technique for remotely measuring the pressure profile using the trough absorption region between two strong lines in the oxygen A band is described. The theory of integrated vertical path, differential ranging, and horizontal path pressure measurements is given with methods to desensitize and correct for temperature effects ...
C L, Korb, C Y, Weng
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Differential-Absorption Lidar for Water Vapor and Temperature Profiling
2006The application of differential absorption lidar to narrow lines of the rotational-vibrational spectrum of water vapor or oxygen for humidity and temperature profiling is technically demanding with respect to the laser source and the data acquisition. Many details need to be considered carefully in system design and data evaluation.
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