Record Display for the EPA National Library Catalog


Main Title A study of the effects of aerosol properties on scattering of laser light /
Author Byers, R. L., ; Coope, Douglas W. ; Davi, John W.
Other Authors
Author Title of a Work
Cooper, Douglas W.
Davis, John W.
CORP Author Pennsylvania State Univ., University Park. Center for Air Environment Studies.
Publisher Pennsylvania State University,
Year Published 1971
Report Number APTD 0796; CPA-70-103
Stock Number PB-204 356
Additional Subjects ( Aerosols ; Light scattering) ; ( Optical radar ; Air pollution) ; ( Particles ; Gas detectors) ; Backscattering ; Humidity ; Laser beams ; Particles ; Depolarization(Waves) ; Field tests ; Alkali metal compounds ; Dyes ; Particle size ; Air pollution detection ; Alkali halides
Library Call Number Additional Info Location Last
NTIS  PB-204 356 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation xiii, 137 leaves : illustrations
The influence of several variables on the backscattering of laser light by aerosols was studied. He-Ne laser light was used to illuminate aerosol particles generated by a Collison atomizer. The backscattering of light by the particles (effective angle: 173.5) was measured as a function of relative himidity. Depolarization and field studies were also made. Potassium chloride, sodium chloride, and sodium bromide particles all scattered more than twice as much light after becoming droplets. The change in phase occurred at lower humidities than those appropriate for the bulk material. These salt particles depolarized 13 to 25% of the incident polarized light intensity when dry particles and 6 to 12% of the incident light when droplets. The effect of changing ambient relative humidity was also studied for methylene blue dye and uranine dye particles. Depolarization measurements were also made for polystyrene latex and dioctyl phthalate aerosols. These gave depolarizations of 6% and 4% respectively. The laboratory device which measured the backscattering from the aerosols was used in a field test along with a LIDAR device. The field test, while not conclusive, indicated that relative humidity did affect LIDAR measurements. (Author)
Prepared for Environmental Protection Agency by Pennsylvania State University, Center for Air Environment Studies under Contract Number CPA 70-103. "Final report." "July 1, 1971." Includes bibliographical references (leaves 115-117). Microfiche.