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  • 1
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Infrared (IR) molecular spectroscopy is proposed to perform remote measurements of NOx 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 NO2 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.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0022-4073
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hydroxyl radicalOH is one of the most important, but yet least investigated, atmospheric species. For an improved understanding of its strong involvement in stratospheric chemistry, more data is needed which provides concentrations ofOh and related species at any latitude, longitude, season and day of time. This requirement can not be fulfilled by existing stratospheric sensors Balloon-borne sensors provide data up to 40km, yet they are subject to the typical restrictions for balloon operation, while airborne in-situ measurements are limited by the maximum altitude of the aircraft. In this study it is shown, that an airborne Far Infrared heterodyne receiver is able to meet the need for a versatile stratosphericOH sensor. Based on both the high spectral resolution and sensitivity of heterodyne receivers and the availability of airborne heterodyne technology it will be shown that this instrument is capable of retrieving data with the greatly expanded spatial and temporal coverage required. When operated on a standard aircraft at an altitude of 12km, the heterodyne receiver can retrieve concentration profiles from above the flight altitude with a typical altitude resolution of 5 to 7km.
    Type of Medium: Electronic Resource
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