Monitoring Complex Trace-Gas Mixtures By Long-Path Laser Absorption Spectrometry

B. D. Green; J. I. Steinfeld

doi:10.1117/12.955302

10 April 1977 Monitoring Complex Trace-Gas Mixtures By Long-Path Laser Absorption Spectrometry

B. D. Green, J. I. Steinfeld

Proceedings Volume 0099, 3rd European Electro-Optics Conf; (1977) https://doi.org/10.1117/12.955302
Event: Third European Electro-Optics Conference, 1976, Geneva, Switzerland

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.

Citation Download Citation

B. D. Green and J. I. Steinfeld "Monitoring Complex Trace-Gas Mixtures By Long-Path Laser Absorption Spectrometry", Proc. SPIE 0099, 3rd European Electro-Optics Conf, (10 April 1977); https://doi.org/10.1117/12.955302

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