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Proceedings Paper

Infrared tunable diode laser measurements of nitrogen oxide species in an aircraft engine exhaust
Author(s): Joda C. Wormhoudt; Mark S. Zahniser; David D. Nelson; J. Barry McManus; R. C. Miake-Lye; Charles E. Kolb
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Paper 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.

Paper Details

Date Published: 29 September 1995
PDF: 10 pages
Proc. SPIE 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow, (29 September 1995); doi: 10.1117/12.221559
Show Author Affiliations
Joda C. Wormhoudt, Aerodyne Research, Inc. (United States)
Mark S. Zahniser, Aerodyne Research, Inc. (United States)
David D. Nelson, Aerodyne Research, Inc. (United States)
J. Barry McManus, Aerodyne Research, Inc. (United States)
R. C. Miake-Lye, Aerodyne Research, Inc. (United States)
Charles E. Kolb, Aerodyne Research, Inc. (United States)


Published in SPIE Proceedings Vol. 2546:
Optical Techniques in Fluid, Thermal, and Combustion Flow
Soyoung Stephen Cha; James D. Trolinger, Editor(s)

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