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PHOTOACOUSTIC MEASUREMENT OF AMMONIA IN THE ATMOSPHERE - INFLUENCE OF WATER-VAPOR AND CARBON-DIOXIDE

被引：100
作者：
ROOTH, RA
VERHAGE, AJL
WOUTERS, LW
机构：
[1] N.V. Tot Keuring van Elektrotechnische Materialen, Arnhem, NL-6800 ET
来源：
APPLIED OPTICS | 1990年 / 29卷 / 25期
关键词：
Acoustic resonance; Ammonia; Ammonia adhesion; Carbon dioxide absorption; CO[!sub]2[!/sub] laser radiation; Kinetic Cooling; Photoacoustics; Trace gas measurements; Water vapor absorption;
D O I：
10.1364/AO.29.003643
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The photoacoustic determination of the ammonia concentration in atmospheric air by absorption of CO2 laser radiation at 9.22 nm is influenced by the presence of H2O and CO2. Kinetic cooling due to the coupling of excited C02 and N2 levels causes important changes in phase and amplitude of the photoacoustic signal. Theoretical background is presented to deduce the correct NH3 concentration from the signal. The experimental setup used to perform field measurements is described. Adhesion of NH3 to the walls of the resonant photoacoustic cell was investigated. Temperature effects are treated. Field data of NH3 and H20 concentrations are presented. © 1990 Optical Society of America.
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页码：3643 / 3653
页数：11
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