Modeling of aircraft exhaust emissions and infrared spectra for remote measurement of nitrogen oxides
Infrared (IR) molecular spectroscopy is proposed to perform remote measurements of NO<sub>x</sub> concentrations in the exhaust plume and wake of aircraft. The computer model NIRATAM is applied to simulate the physical and chemical properties of the exhaust plume and to generate low...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1994-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/12/920/1994/angeo-12-920-1994.pdf |
| Summary: | Infrared (IR) molecular spectroscopy is
proposed to perform remote measurements of NO<sub>x</sub> concentrations in the
exhaust plume and wake of aircraft. The computer model NIRATAM is applied to
simulate the physical and chemical properties of the exhaust plume and to
generate low resolution IR spectra and synthetical thermal images of the
aircraft in its natural surroundings. High-resolution IR spectra of the plume,
including atmospheric absorption and emission, are simulated using the molecular
line-by-line radiation model FASCODE2. Simulated IR spectra of a Boeing 747-400
at cruising altitude for different axial and radial positions in the jet region
of the exhaust plume are presented. A number of spectral lines of NO can be
identified that can be discriminated from lines of other exhaust gases and the
natural atmospheric background in the region around 5.2 µm. These lines can be
used to determine NO concentration profiles in the plume. The possibility of
measuring nitrogen dioxide NO<sub>2</sub> is also discussed briefly, although
measurements turn out to be substantially less likely than those of NO. This
feasibility study compiles fundamental data for the optical and radiometric
design of an airborne Fourier transform spectrometer and the preparation of
in-flight measurements for monitoring of aircraft pollutants. |
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| ISSN: | 0992-7689 1432-0576 |