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Proceedings Paper

Infra-Red Gas Analysis Over Open Paths For Industrial Waste Gases
Author(s): Peter J. Webb
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Paper 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.

Paper Details

Date Published: 1 May 1986
PDF: 8 pages
Proc. SPIE 0590, Infrared Technology and Applications, (1 May 1986); doi: 10.1117/12.951998
Show Author Affiliations
Peter J. Webb, Land Combustion Limited (England)

Published in SPIE Proceedings Vol. 0590:
Infrared Technology and Applications
Lionel R. Baker; Andre Masson, Editor(s)

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