The differential absorption method is the best one from the point of view of its potentialities in applications to solving the problems of sensing atmospheric gaseous pollutants. The middle IR spectral range from 2 to 14 micrometers is most attractive for measurements since well-resolved absorption spectra of almost all the atmospheric gases are observed here. This paper presents some results of monitoring several trace atmospheric constituents, including CO, C₂H₄ and NH₃ using a gas analyzer, based on the use of two CO₂ lasers and a set of frequency converters. The gas analyzer with a discretely frequency-tuned CO₂ laser was taken as the basic device for this study. Use of a ZnGeP₂ monocrystal for frequency doubling enables one to measure CO concentration in addition to concentrations of ethylene, water vapor, ammonia under field conditions.

Date Published: 1 July 1992
PDF: 4 pages
Proc. SPIE 1811, Tenth All-Union Symposium and School on High-Resolution Molecular Spectroscopy, (1 July 1992); doi: 10.1117/12.131180

Published in SPIE Proceedings Vol. 1811:
Tenth All-Union Symposium and School on High-Resolution Molecular Spectroscopy
Leonid N. Sinitsa, Editor(s)