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Multipass open-path Fourier-transform infrared measurements for nonintrusive monitoring of gas turbine exhaust composition

Klaus Schäfer, Klaus Brockmann, Jörg Heland, Peter Wiesen, Carsten Jahn, and Olivier Legras

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Abstract

The detection limits for NO and NO2 in turbine exhausts by nonintrusive monitoring have to be improved. Multipass mode Fourier-transform infrared (FTIR) absorption spectrometry and use of a White mirror system were found from a sensitivity study with spectra simulations in the mid-infrared to be essential for the retrieval of NO2 abundances. A new White mirror system with a parallel infrared beam was developed and tested successfully with a commercial FTIR spectrometer in different turbine test beds. The minimum detection limits for a typical turbine plume of 50 cm in diameter are approximately 6 parts per million (ppm) for NO and 9 ppm for NO2 (as well 100 ppm for CO2 and 4 ppm for CO).

© 2005 Optical Society of America

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