| 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 |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| EHAM |
EPA-600/2-79-192 |
|
Region 1 Library/Boston,MA |
05/25/2016 |
| EJBD ARCHIVE |
EPA 600-2-79-192 |
|
Headquarters Library/Washington,DC |
09/07/2011 |
| 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 |
| 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. |
| Abstract |
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. |
| Notes |
"EPA-600/2-79-192." EPA contract no. 68-02-2786, EPA project officer: John S. Nader. Includes bibliographical references. |
