Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Comparative Study of Plume Opacity Measurement Methods.
Author Conner, William D. ; White, Norman ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1980
Report Number EPA/600/2-80-001;
Stock Number PB80-128440
Additional Subjects Plumes ; Opacity ; Optical measurement ; Optical radar ; Transmissometers ; Observation ; Performance evaluation ; Air pollution monitors ; Comparative evaluations
Library Call Number Additional Info Location Last
NTIS  PB80-128440 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 35p
The opacity of smoke-stack emissions was measured by three methods at thirteen different plants and the results compared. The three opacity measurement methods are trained observer, in-stack transmissometer, and laser radar (lidar). The instrumental methods, lidar and in-stack transmissometer, correlated better with each other than with the observer method and were also more precise than the observer method. Observer measurements were generally lower than instrumental measurements. Data show that for the range of opacity emission standards (betwen 10 and 40% opacity), the observer readings averaged 6 and 11% opacity less than the instrumental readings of lidar and transmissometer, respectively, and varied by as much as 25% opacity below to 8% opacity above the instrumental readings.