Record Display for the EPA National Library Catalog


Main Title A diffraction technique to measure size distribution of large airborne particles /
Author McSweeney, A.
Other Authors
Author Title of a Work
McSweeney, A.
Ellestad, T. G.
Ellestad, T.G.
CORP Author Georgia Inst. of Tech., Atlanta. Engineering Experiment Station.;Environmental Sciences Research Lab., Research Triangle Park, N.C. Aerosol Research Branch.
Publisher Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1976
Report Number EPA-600/3-76-073; EPA-R-802214
Stock Number PB-255 454
OCLC Number 52451959
Subjects Air--Pollution--Measurement ; Aerosols ; Particles
Additional Subjects Air pollution ; Particle size distribution ; Optical detection ; Aerosols ; Coherent radiation ; Laser beams ; Diffraction ; Optical measurement ; Dimensional measurement ; Design ; Performance evaluation ; Computerized simulation ; Air pollution sampling ; Air pollution detection
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600-3-76-073 Headquarters Library/Washington,DC 03/18/2014
EKBD  EPA-600/3-76-073 Research Triangle Park Library/RTP, NC 07/11/2003
ELBD ARCHIVE EPA 600-3-76-073 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ESAD  EPA 600-3-76-073 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-255 454 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 47 p. : ill. ; 28 cm.
The purpose of this project is to test and demonstrate a coherent optical diffraction technique for measuring the size distribution of large particles. This technique is based on the generation of a transformation matrix which is used to relate the measured diffraction patterns to the size distribution of the samples that produced the patterns. Four types of samples are considered: (1) pinholes in opaque discs, (2) photographic transparencies with opaque circular spots, (3) particles deposited on microscope slides, and (4) aerosols. Computer simulations are performed to assess the accuracy and resolution of the techniques. Although good results are obtained for pinholes in opaque discs, experimental difficulties limit the precision of this technique applied to particles in a transparent medium. Improvements based on a reduction of system noise and an increase in detector sensitivity are discussed and applied to the requirements on number density and size range of particles in a transparent medium.
"EPA-600/3-76-073." "June 1976." "Project Officer: T.G. Ellestad". Includes bibliographical references (p. 41-46).