Record Display for the EPA National Library Catalog


Main Title Optical instrument for in-stack monitoring of particle size /
Author Wertheimer, Alan Lee, ; Trainer, M. N.
Other Authors
Author Title of a Work
Trainer, Michael N.
Stevens, Robert K.
CORP Author Leeds and Northrup Co., North Wales, PA.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, Environmental Sciences Research Laboratory,
Year Published 1979
Report Number EPA-68-02-2447; EPA 600-2-79-032;
Stock Number PB292751
OCLC Number 42637936
Subjects Fly ash--Measurement ; Contamination (Technology)
Additional Subjects Particle size distribution ; Monitors ; Light scattering ; Optical equipment ; Design criteria ; Fly ash ; Electric power plants ; Combustion products ; Industrial wastes ; Performance evaluation ; Field tests ; Air pollution detection ; Coal fired power plants
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EHAM  EPA 600-2-79-032 Region 1 Library/Boston,MA 05/25/2016
EJBD ARCHIVE EPA 600-2-79-032 Headquarters Library/Washington,DC 10/31/2012
EJBD  EPA 600-2-79-032 c.1 Headquarters Library/Washington,DC 01/16/2014
EKBD  EPA-600/2-79-032 Research Triangle Park Library/RTP, NC 11/15/2016
ESAD  EPA 600-2-79-032 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-292 751 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation ix, 67 pages : illustrations ; 28 cm.
A new light scattering instrument for in-situ measurements of particulates in the 0.2 to 10.0 micrometer diameter size range is described. Two modes of scattering are used, each with two wavelengths of light, to generate five size fractions by volume from a distribution of particulates. One mode measures polarized light scattered in two orthogonal orientations at an angle of 90 degrees to the optical probe beam. The second mode measures light scattered in near forward angles (4 to 11 degrees). Both modes allow the extraction of size data when particles of different sizes are present simultaneously in the sensing region. These principles have been incorporated into a prototype portable stack monitor, consisting of a 1.5 meter long, 9 cm diameter insertable probe capable of withstanding temperatures up to 260C. The optical signals are carried through fiber optic cables contained in the probe. An arc source and silicon photodetectors are outside the stack at the end of the probe, while a digital microprocessor analyzes the set of measurements and calculates the size fractions. The microprocessor, an air purge system, the lamp power supply, and a digital printer are housed separately from the probe for ease of installation and service. The completed instrument was tested on coal-fired fly ash particulates in the laboratory at a stationary source simulator facility and in the field at a coal-fired power plant. Results and comparisons with other sizing techniques are presented.
"EPA-600/2-79-032." EPA contract no. 68-02-2447; EPA project officer: William D. Conner. Includes bibliographical references (page 66).