Particle size evaluations using multiwavelength extinction measurements

Journal Article · Mon Feb 01 04:00:00 EST 1982 · Appl. Opt.; (United States)

DOI:https://doi.org/10.1364/AO.21.000454· OSTI ID:5590690

Uthe, E E

As the first phase of program to develop a lidar method of remote evaluation of mean particle size of stationary source emissions, a data base was experimentally collected consisting of multiple-wavelength extinction coefficients and mean particle sizes of generated aerosols. Extinction data were collected using multi-wavelength (14) transmissometers and a 10-m long aerosol tunnel facility. Generated aerosols consisted of five size fractions of fly ash, three size fractions of silica, and single-size fractions of six other types of particulate material. Particle size evaluations were made by multistage impactor and by air permeability (Fisher) analysis of packed powder. The data base indicates that mean particle size smaller than 1-..mu..m diam could be estimated usefully from aerosol extinction measurements using a single-laser lidar system operating at 1.06- and 0.53-..mu..m wavelengths. For larger mean particle sizes the extinction ratio is near unity, and longer wavelength systems are required. The data indicate that a two-laser lidar operating at 10.6 and 0.53 ..mu..m could provide estimates of mean particle size to diameters of at least 6 ..mu..m.

• Research Organization: SRI International, Atmospheric Science Center, Menlo Park, California 94025
• OSTI ID: 5590690
• Journal Information: Appl. Opt.; (United States), Journal Name: Appl. Opt.; (United States) Vol. 21:3; ISSN APOPA
• Country of Publication: United States
• Language: English

Related Subjects

440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTIVITY
AEROSOLS
COLLOIDS
DISPERSIONS
LIGHT SCATTERING
LIGHT TRANSMISSION
MEASURING INSTRUMENTS
OPTICAL PROPERTIES
OPTICAL RADAR
PARTICLE SIZE
PERFORMANCE TESTING
PHYSICAL PROPERTIES
RADAR
RANGE FINDERS
REMOTE SENSING
SCATTERING
SIZE
SOLS
TESTING