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Differential Absorption Lidar: Effects of Speckle Noise,
RESEARCH INST OF NATIONAL DEFENCE STOCKHOLM (SWEDEN)
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There is today a need for methods for remote monitoring in real time of air pollutants. Among the methods studied for this purpose during the last years, the differential absorption lidar DIAL technique has been found to be the most promising one. In the DIAL technique one uses a laser radar with a frequency which can be tuned in the neighborhood of an absorption line of a gas in the atmosphere. One measures the intensity of light backscattered from atmospheric aerosol particles, a topographical target, or a retroreflector. From the ratio of backscattered intensity at two wavelengths, one on and one off the particular absorption line, the gas content in the air column between the laser radar and the scattering volume can be obtained.
APPROVED FOR PUBLIC RELEASE