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13 February 2001 Turbine engine exhaust gas measurements using in-situ FT-IR emission/transmission spectroscopy
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Proceedings Volume 4201, Optical Methods for Industrial Processes; (2001)
Event: Environmental and Industrial Sensing, 2000, Boston, MA, United States
12 An advanced multiple gas analyzer based on in-situ Fourier transform infrared spectroscopy has been used to successfully measure the exhaust plume composition and temperature of an operating gas turbine engine at a jet engine test stand. The sensor, which was optically coupled to the test cell using novel broadband hollow glass waveguides, performed well in this harsh environment (high acoustical noise and vibration, considerable temperature swings in the ambient with engine operation), providing quantitative gas phase information. Measurements were made through the diameter of the engine's one meter exhaust plume, about 0.7 meters downstream of the engine exit plane. The sensor performed near simultaneous infrared transmission and infrared emission measurements through the centerline of the plume. Automated analysis of the emission and transmission spectra provided the temperature and concentration information needed for engine tuning and control that will ensure optimal engine operation and reduced emissions. As a demonstration of the utility and accuracy of the technique, carbon monoxide, nitric oxide, water, and carbon dioxide were quantified in spite of significant variations in the exhaust gas temperature. At some conditions, unburned fuel, particulates (soot/fuel droplets), methane, ethylene and aldehydes were identified, but not yet quantified.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David F. Marran, Joseph E. Cosgrove, Jorge Neira, James R. Markham, Ronald Rutka, and Richard R. Strange "Turbine engine exhaust gas measurements using in-situ FT-IR emission/transmission spectroscopy", Proc. SPIE 4201, Optical Methods for Industrial Processes, (13 February 2001);

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