Photoacoustic measurement of ammonia in the atmosphere: influence of water vapor and carbon dioxide
- N. V. Tot Keuring van Elektrotechnische Materialen, Postbus 9035, NL-6800 ET Arnhem (The Netherlands)
The photoacoustic determination of the ammonia concentration in atmospheric air by absorption of CO{sub 2} laser radiation at 9.22 {mu}m is influenced by the presence of H{sub 2}O and CO{sub 2}. Kinetic cooling due to the coupling of excited CO{sub 2} and N{sub 2} levels causes important changes in phase and amplitude of the photoacoustic signal. Theoretical background is presented to deduce the correct NH{sub 3} concentration from the signal. The experimental setup used to perform field measurements is described. Adhesion of NH{sub 3} to the walls of the resonant photoacoustic cell was investigated. Temperature effects are treated. Field data of NH{sub 3} and H{sub 2}O concentrations are presented. Key words: Photoacoustics, ammonia, kinetic cooling, trace gas measurements, ammonia adhesion, acoustic resonance, CO{sub 2} laser radiation, water vapor absorption, carbon dioxide absorption.
- OSTI ID:
- 6175247
- Journal Information:
- Applied Optics; (USA), Vol. 29:25; ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
Similar Records
Investigation of in situ high temperature sensor based on the direct absorption spectroscopy signal of ammonia gas for coal-fired power plant
Fertilizer timing affects nitrous oxide, carbon dioxide, and ammonia emissions from soil
Related Subjects
AMMONIA
AIR POLLUTION MONITORING
SURFACE AIR
ACID RAIN
ACIDIFICATION
CARBON DIOXIDE
EARTH ATMOSPHERE
EXPERIMENTAL DATA
FIELD TESTS
NETHERLANDS
PHOTOACOUSTIC SPECTROSCOPY
QUANTITY RATIO
TEMPERATURE EFFECTS
TIME RESOLUTION
WATER VAPOR
AIR
ATMOSPHERIC PRECIPITATIONS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DATA
EUROPE
FLUIDS
GASES
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RAIN
RESOLUTION
SPECTROSCOPY
TESTING
TIMING PROPERTIES
VAPORS
WESTERN EUROPE
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)