Infrared tunable diode laser measurements of nitrogen oxide species in an aircraft engine exhaust

Joda C. Wormhoudt; Mark S. Zahniser; David D. Nelson Jr.; J. Barry McManus; R. C. Miake-Lye; Charles E. Kolb

doi:10.1117/12.221559

29 September 1995 Infrared tunable diode laser measurements of nitrogen oxide species in an aircraft engine exhaust

Joda C. Wormhoudt, Mark S. Zahniser, David D. Nelson Jr., J. Barry McManus, R. C. Miake-Lye, Charles E. Kolb

Proceedings Volume 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow; (1995) https://doi.org/10.1117/12.221559
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Recent requirements for better characterization of the trace species in the exhausts of advanced aircraft engines have resulted in the development, under NASA sponsorship, of a tunable infrared diode laser system capable of making both in situ and extractive sampling measurements. In this paper, we describe the first application of this instrument to nonintrusive, cross-flow measurements in the exhaust of an aircraft engine operating in an altitude test cell. Simultaneous absorption measurements of NO, NO₂ and H₂O using the combined beams from two lasers were made at a variety of engine and flight conditions. The utility of measuring concentrations of major species such as H₂O to convert line of sight observations of trace species into mass fluxes is discussed, as are uncertainties in the measurement resulting from fluctuations in the absorption spectra and from conversion from integrated column density to concentration profiles.

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Joda C. Wormhoudt, Mark S. Zahniser, David D. Nelson Jr., J. Barry McManus, R. C. Miake-Lye, and Charles E. Kolb "Infrared tunable diode laser measurements of nitrogen oxide species in an aircraft engine exhaust", Proc. SPIE 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow, (29 September 1995); https://doi.org/10.1117/12.221559

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