Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title A real-time measuring device for dense paritculate systems /
Author Chan, P. W. ; She, C. Y. ; Ho, C. W. ; Tueton., A. ;
Other Authors
Author Title of a Work
Chan, P. W.
CORP Author Colorado State Univ., Fort Collins.;Industrial Environmental Research Lab., Research Triangle Park, N.C.
Publisher Environmental Protection Agency, Office of Energy, Minerals, and Industry, Industrial Environmental Research Laboratory ; For sale by the National Technical Information Service,
Year Published 1977
Report Number EPA/600/2-77/022; EPA-R-803532; EPA/ROAP-21ADL-018
Stock Number PB-268 550
OCLC Number 03741055
ISBN pbk.
Subjects Air--Pollution--Measurement. ; Air--Pollution--Measurement.
Additional Subjects Particle size distribution ; Gas detectors ; Air pollution ; Aerosols ; Gas analysis ; Chemical analysis ; Design criteria ; Performance evaluation ; Monitoring ; Circuits ; Mie scattering ; Concentration(Composition) ; Numerical analysis ; Optical measuring instruments ; Light scattering ; Calibrating ; Air pollution detection
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-2-77-022 Headquarters Library/Washington,DC 04/10/2014
EKAM  EPA-600/2-77-022 Region 4 Library/Atlanta,GA 11/20/1998
EKBD  EPA-600/2-77-022 Research Triangle Park Library/RTP, NC 09/07/2001
ESAD  EPA 600-2-77-022 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-268 550 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation vii, 59 p. : ill. ; 28 cm.
The report describes the design and performance of an instrument, based on the concept of instantaneous intensity ratio, for measuring particle size distributions of dense particulate matter. The method involves simultaneously measuring the intensity of light scattered by a particle at two small angles, and then taking their ratio. The ratio depends on particle size, but has minimal dependence on refractive index. By using a pulse height analyzer as the display device, particle size distribution changes can be detected rapidly. Thus in situ, real-time monitoring of size distributions can be achieved. The instrument allows more than one particle in the focal volume at any instant and selects the scattered light pulses randomly for processing, enabling dense particulate matter to be sized accurately. The concept is discussed. The instrument's detailed design features are presented. Calibration has been performed using monodisperse aerosols of accurately known diameter. The effect of refractive index is investigated, and the performance and limitations of the instrument are discussed. It is shown that, by incorporating the concept of random selection of input pulses, the concentration handling capacity is improved by an order of magnitude.
Prepared under grant no. R803532-01-0, ROAP no. 21ADL-018, program element no. 1ABO12. Issued Jan. 1977. Includes bibliographical references.