Main Title |
A diffraction technique to measure size distribution of large airborne particles / |
Author |
McSweeney, A.
|
Other Authors |
|
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 |
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
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. |
Abstract |
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. |
Notes |
"EPA-600/3-76-073." "June 1976." "Project Officer: T.G. Ellestad". Includes bibliographical references (p. 41-46). |