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Lumencor Inc. - Power of Light 4-24 LB
Photonics Dictionary

differential absorption lidar

A lidar (light detection and ranging) technique used in pollution monitoring. Two light beams are emitted simultaneously, one at a wavelength that will be absorbed by the target particles, and the second at a nearby wavelength that will not. The measurement of the light scattered by both beams yields information about the range and concentration of the pollutant.
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