Quantitative determination of gaseous nitrogen dioxide concentrations over long path lengths by selective absorption of argon ion laser emission
An argon ion laser emits several laser lines in the visible region of the optical spectrum. The absorption coefficients of NO/sub 2/ at these laser emissions were measured in a multiple pass absorption cell. A differential technique, in which the ratio of the transmitted intensities of the argon laser emissions is measured, is described to determine the concentration of NO/sub 2/ in a polluted atmosphere over path lengths of several kilometers. Measurement of ratios eliminates interferences from particle scattering and thermal index gradients. Evaluation of the data taken in the 48 meter multipass cell indicates that concentrations of NO/sub 2/ less than one part per million could be determined in a 1 km optical path. (auth)
- Research Organization:
- National Bureau of Standards, Washington, DC
- OSTI ID:
- 7367604
- Journal Information:
- J. Air Pollut. Control Assoc.; (United States), Vol. 25:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHEMICAL LASERS
EMISSION
NITROGEN OXIDES
ECOLOGICAL CONCENTRATION
QUANTITATIVE CHEMICAL ANALYSIS
AIR POLLUTION
ARGON IONS
GASES
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
FLUIDS
IONS
LASERS
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)