Record Display for the EPA National Library Catalog


Main Title Cross-stack optical convolution velocimeter : development and evaluation of a breadboard design /
Author Rudd, Michael J. ; Rudd, M. J.
CORP Author Bolt Beranek and Newman, Inc., Cambridge, MA.;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-600/2-79-192
Stock Number PB80-129273
OCLC Number 42394790
Subjects Gas flow--Measurement
Additional Subjects Speed indicators ; Plumes ; Velocity measurement ; Optical measurement ; Convolution integrals ; Gas flow ; Dust ; Mathematical models ; Performance evaluation ; Pitot tubes ; Air pollution sampling
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EHAM  EPA-600/2-79-192 Region 1 Library/Boston,MA 05/25/2016
EJBD  EPA 600-2-79-192 c.1 Headquarters Library/Washington,DC 01/29/2014
EKBD  EPA-600/2-79-192 Research Triangle Park Library/RTP, NC 07/04/2003
ELBD ARCHIVE EPA 600-2-79-192 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
NTIS  PB80-129273 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation viii, 31 pages : figures, tables, graphs ; 28 cm.
A new type of instrument has been designed and evaluated for the measurement of a line average of a stack gas velocity. The light output from a lamp is collimated and projected across the stack. A shadowgraph image of the turbulence in the stack is produced on the far side and this image is convected by the stack gas flow. A grating is placed over the image and the light transmitted falls on a photodetector. The frequency output from the photodetector is the rate at which the shadow graph image crosses the grating. A breadboard design of this cross-stack optical convolution velocimeter (OCV), as it is called, was built and evaluated over a wide range of environmental conditions. Agreement between the OCV and a corrected pitot tube was within 1.3% (root mean square error). Position sensitivity of the OCV was extensively studied and a configuration was found that is completely insensitive to position. Laboratory tests showed that the cross-stack OCV is an effective, accurate velocity monitoring instrument that is simple to build and operate.
"EPA-600/2-79-192." EPA contract no. 68-02-2786, EPA project officer: John S. Nader. Includes bibliographical references.