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Gas correlation lidar and differential optical absorption spectroscopy for atmospheric pollution monitoring

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Abstract

Gas correlation techniques can be extended to the lidar situations resulting in favorable SNR and relaxed laser requirements in range-resolved measurements of atmospheric gas constituents. In particular, only one fairly broadband laser is needed, and no laser tuning is necessary between pulses. On and off resonance wavelengths are transmitted simultaneously. The principle of the technique is illustrated in Fig. 1, where a model example of Hg monitoring has been chosen. Temporal and spectral properties of the signal are shown at different positions in the system. The sensitivity of a gas correlation lidar system depends on the relative size of the spectral regions of absorption and nonabsorption. Very broadband or multiline lasers can be used or even flashlamps for gases with suitable spectral properties. Measurements using different versions of the gas correlation technique will be discussed.

© 1985 Optical Society of America

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