Main Title |
Investigation of Resonant Optoacoustic Cells. |
Author |
Plyler, Robert R. ;
Patty, Richard R. ;
|
CORP Author |
North Carolina State Univ. at Raleigh.;Environmental Sciences Research Lab., Research Triangle Park, NC. |
Year Published |
1983 |
Report Number |
EPA-R-805332; EPA-600/3-83-070; |
Stock Number |
PB83-251637 |
Additional Subjects |
Air pollution ;
Gas detectors ;
Trace elements ;
Resonance radiation ;
Laser beams ;
Comparison ;
Concentration(Comparison) ;
Gas analysis ;
Chemical analysis ;
Sampling ;
Design criteria ;
Performance evaluation ;
Foreign technology ;
Acoustooptics ;
Air pollution detection ;
Elliptical cells ;
Helmholtz cells ;
Resonant cells
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB83-251637 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
33p |
Abstract |
A theory describing the optoacoustic signal is presented; dependence on both cell and gas parameters are given and the advantage of operating at a resonant frequency is discussed. Three elliptical cells with major axes 5.8, 12.7, and 15.2 cm (corresponding minor axes 5.5, 11.0; and 7.6 cm) were utilized as resonant optoacoustic cells. Longitudinal standing waves analagous to radial resonances for a cylindrical cell were driven by passing the beam from a CO2 laser along one focus of the ellipse. Results are compared with measurements on a Helmholtz cell for which the minimum detectable absorption coefficient was about 2 x 10 to the -7th power cm. Windowless operation was attempted, and the results indicate that further improvement is possible. |
PUB Date Free Form |
Aug 83 |
Category Codes |
14B; 68A; 99A |
NTIS Prices |
PC A03/MF A01 |
Primary Description |
600/09 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
334322647 |
Origin |
NTIS |
Type |
CAT |