| Main Title |
Application of a Telephotometer to Visibility Measurements in the Eastern United States. |
| Author |
Ellestad, Thomas G. ;
Speer, Ronald E. ;
|
| CORP Author |
Environmental Sciences Research Lab., Research Triangle Park, NC. |
| Year Published |
1981 |
| Report Number |
EPA-600/J-81-024; |
| Stock Number |
PB82-205899 |
| Additional Subjects |
Visibility ;
Light transmission ;
Aerosols ;
Light scattering ;
Air pollution ;
Reprints ;
Extinction coefficients ;
Atmospheric transmissivity ;
Eastern Region(United States) ;
Telephotometry ;
Air quality
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB82-205899 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
9p |
| Abstract |
Theories of light extinction and contrast reduction by atmospheric aerosols are reviewed. Measurements by a telephotometer of the relatively turbid atmosphere of the eastern U.S. are described. Because of current levels of extinction, it is feasible to apply a dual target technique first described by Ruhle, which corrects for the targets' imperfect blackness and stray light imperfections in the telephotometer optics. Measurements have been made during an intensive visibility study in the Ohio River Basin. These results compare favorably to independent measures of scattering and absorption coefficients. Complications introduced by uneven illumination due to clouds are found to be surprisingly small; only the most obvious cases of poor illumination need be excluded. |
| Supplementary Notes |
Pub. in Atmospheric Environment, v15 n12 p2443-2449 1981. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Application of a Telephotometer to Visibility Measurements in the Eastern United States. |
| PUB Date Free Form |
1981 |
| Category Codes |
4A; 55E; 68A |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/09 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
323814823 |
| Origin |
NTIS |
| Type |
CAT |
