Abstract

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 Γ-type spectral distribution of the droplet sizes during the various evolution stages of the fog. The artificial fog is produced in a 40-m³ 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.

© 1970 Optical Society of America

Precise size distribution measurement of aerosol particles and fog droplets in the open atmosphere

Huige Di, Zhixiang Wang, and Dengxin Hua
Opt. Express 27(12) A890-A908 (2019)

Comparative Studies of Extinction and Backscattering by Aerosols, Fog, and Rain at 10.6 μ and 0.63 μ

D. B. Rensch and R. K. Long
Appl. Opt. 9(7) 1563-1573 (1970)

Fog droplet distribution functions for lidar

J. V. Mallow
Appl. Opt. 21(8) 1454-1456 (1982)

Extinction-sedimentation inversion technique for measuring size distribution of artificial fogs

Adarsh Deepak and O. H. Vaughan
Appl. Opt. 17(3) 374-378 (1978)

Infrared Emission by Fine Water Aerosols and Fogs

H. R. Carlon
Appl. Opt. 9(9) 2000-2006 (1970)