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Evolution of the Fog Droplet Size Distribution Observed by Laser Scattering,
ISTITUTO DI FISICA DELL'ATMOSFERA ROME (ITALY)
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Scattering of a continuous wave He-Ne laser beam in artificial fog is observed by five photometers at different angles. The measured intensity of the light scattered in the different directions is related to a T-type spectral distribution of the droplet sizes during the various evolution stages of the fog. The artificial fog is produced in a 40 cubic meter chamber, where the main physical parameters vapor and nuclei concentration, temperature can be controlled to reproduce the complete evolution process. The fog droplet size spectrum is determined at intervals of about 1 min. The results show that the size distribution shifts towards larger size droplets during condensation, and that the shift is reversed during fog dissipation. Author
APPROVED FOR PUBLIC RELEASE