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Proceedings Paper

Monitoring Complex Trace-Gas Mixtures By Long-Path Laser Absorption Spectrometry
Author(s): B. D. Green; J. I. Steinfeld
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Paper Abstract

Laser-based spectrophotometric methods which have been proposed for the detection of trace concentrations of gaseous contaminants include Raman (LIDAR) and passive radiometry (LOPAIR). In this report, we discuss a simple long-path laser absorption method (LOLA) which is capable of resolving complex mixtures of closely related trace contaminants at ppm levels. A number of species were selected which are most likely to accumulate in closed environments, such as submarines or long-duration manned space flights. Absorption coefficients at CO2 laser wavelengths were measured, accurate to ± 3% or better, for each of these species. This data was then used to determine the presence and concentration of the contaminants in prepared mixtures of twelve to fifteen gases. Computer programs have been developed which will permit a real-time analysis of the monitored atmosphere. Minimum detectable concentrations for individual species are generally in the ppm range, and are not seriously degraded by interferences even in complex mixtures. Estimates of the dynamic range of this monitoring technique for various system configurations, and comparison with other methods of analysis, will be discussed.

Paper Details

Date Published: 10 April 1977
PDF: 8 pages
Proc. SPIE 0099, 3rd European Electro-Optics Conf, (10 April 1977); doi: 10.1117/12.955302
Show Author Affiliations
B. D. Green, Massachusetts Institute of Technology (United States)
J. I. Steinfeld, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 0099:
3rd European Electro-Optics Conf
Herbert A. Elion, Editor(s)

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