Infra-Red Gas Analysis Over Open Paths For Industrial Waste Gases

Peter J. Webb

doi:10.1117/12.951998

1 May 1986 Infra-Red Gas Analysis Over Open Paths For Industrial Waste Gases

Peter J. Webb

Proceedings Volume 0590, Infrared Technology and Applications; (1986) https://doi.org/10.1117/12.951998
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

Abstract

Conventional infra-red gas analysers require the gas stream to be sampled, introducing problems associated with cleaning the sample and, in the case of water vapour, ensuring that no condensation occurs in the sampling lines and analyser. The paper presents the development of instruments designed to solve these problems at source by obtaining the measurements in situ over open paths, thus eliminating the need to sample the gas stream. The technique presented for the analysis of water vapour is to transmit across the waste gas ducting a narrow spectral band of radiation which coincides with the 1.87μm water vapour absorption band. In addition, two wavelengths outside the absorption band, are employed as a reference to compensate for the attenuation of the beam by other agents, such as particulate matter transported by the gas stream. The method presented for the analysis of carbon monoxide differs in that instead of using interference filters to define narrow spectral bands the gas cell correlation technique is employed.

Citation Download Citation

Peter J. Webb "Infra-Red Gas Analysis Over Open Paths For Industrial Waste Gases", Proc. SPIE 0590, Infrared Technology and Applications, (1 May 1986); https://doi.org/10.1117/12.951998

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