| 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 |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| EJBD ARCHIVE |
EPA 600-2-78-049 |
|
Headquarters Library/Washington,DC |
03/17/2014 |
| 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 |
| 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. |
| Abstract |
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. |
| Notes |
"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. |
