Record Display for the EPA National Library Catalog


Main Title Development of an optical convolution velocimeter for measuring stack flow /
Author Rudd, Michael J.
CORP Author Bolt Beranek and Newman, Inc., Cambridge, Mass.;Air Force Flight Dynamics Lab., Wright-Patterson AFB, Ohio.;Environmental Sciences Research Lab., Research Triangle Park, N.C.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, Environmental Sciences Research Laboratory,
Year Published 1978
Report Number EPA 600/2-78/049; F33615-76-C-3051
Stock Number PB-279 013
OCLC Number 39841830
Subjects Gas flow--Measurement ; Gas flow--Measurement
Additional Subjects Flue gases ; Speed indicators ; Optical measuring instruments ; Combustion products ; Design criteria ; Performance evaluation ; Cost analysis ; Test chambers ; Chimneys ; Wind tunnels ; Air pollution ; Industrial wastes ; Optical convolution velocimeters ; Air pollution detection
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600/2-78/049 Headquarters Library/Washington,DC 05/05/2006
EKBD  EPA-600/2-78-049 Research Triangle Park Library/RTP, NC 06/27/2003
ELBD ARCHIVE EPA 600-2-78-049 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ESAD  EPA 600-2-78-049 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-279 013 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation vii, 27 p. : ill. ; 28 cm.
A new type of instrument has been developed and tested for the measurement of stack flow velocities. The instrument is optical and generates a shadowgraph pattern of the wake from a small heater. This shadowgraph is projected on a mirror grating of precise dimensions and the reflected light detected by a photodiode. The output of the photodiode fluctuates at a frequency that is related to the velocity with which the turbulence is convected across the grating. By measuring this frequency, the flow velocity is determined. A version of this optical convolution velocimeter (OCV), as it is called, has been built to withstand a temperature of 200C and combustion gases. This unit has been tested in both a wind tunnel and EPA's stationary source simulation facility (SSSF). The agreement with a pitot tube was close, 1% in the wind tunnel and 2 - 2.5% in the SSSF. Some difficulty in signal processing was found at high speeds and high temperatures or dust loadings, but this can be cured. The OCV promises to be a much more accurate and easier to use instrument than the pitot tube, at little additional cost.
"EPA-600/2-78-049." EPA contract no. EPA-IAG-D6-F044, program element no. 1AD712 BA-29 (FY-77). USAF contract no. F33615-76-C-3051. EPA project officer: John Nader. USAF technical monitor: Gary A. DuBro.