Remote measurement of the plume shape of aircraft exhausts at airports by passive FTIR spectrometry

Information about the interaction between the exhaust plume of an aircraft jet engine and ambient air is required for the application of small-scale chemistry-transport models to investigate airport air quality. This interaction is not well understood. In order to study the interaction, spatial information about the plume is required. FTIR emission spectroscopy may be applied to analyze the aircraft exhausts. In order to characterize the plumes spatially, a scanning imaging FTIR system (SIGIS) has been improved. SIGIS is comprised of an interferometer (Bruker OPAG), an azimuth-elevation-scanning mirror, a data acquisition and control system with digital signal processors (DSP), an infrared camera and a personal computer. With this instrumentation it is possible to visualise the plume and to obtain information about the temperature distribution within the plume. Measurements are performed at low spectral resolution, because the dynamic environment of these measurements limits the measurement time to about 2 minutes. Measurements of the plume shapes of an APU and of main engines were performed.

[1]  Joerg Heland,et al.  Remote sensing and gas analysis of aircraft exhausts using FTIR emission spectroscopy , 1995, Other Conferences.

[2]  Bernhard Lechner,et al.  AIRCRAFT EMISSION MEASUREMENTS BY REMOTE SENSING METHODOLOGIES AT AIRPORTS , 2003 .

[3]  Rainer Haus,et al.  Remote sensing of gas emissions on natural gas flares , 1998 .

[4]  Roland Harig,et al.  Scanning infrared remote sensing system for identification, visualization, and quantification of airborne pollutants , 2002, SPIE Optics East.

[5]  Roland Harig,et al.  Passive remote sensing of pollutant clouds by FTIR spectrometry: Signal-to-noise ratio as a function of spectral resolution , 2004 .

[6]  Klaus Schäfer,et al.  Determination of major combustion products in aircraft exhausts by FTIR emission spectroscopy , 1998 .

[7]  W. Wolfe,et al.  The Infrared Handbook , 1985 .

[8]  R. Beer.  Remote Sensing by Fourier Transform Spectrometry , 1992 .

[9]  Laurence S. Rothman,et al.  The HITRAN molecular spectroscopic database and HAWKS (HITRAN atmospheric workstation) , 1998, Defense, Security, and Sensing.

[10]  Peter Rusch,et al.  Remote detection of methane by infrared spectrometry for airborne pipeline surveillance: first results of ground-based measurements , 2004, SPIE Remote Sensing.

[11]  Y. Yung,et al.  Atmospheric Radiation: Theoretical Basis , 1989 .

[12]  Roger Burrows,et al.  Nonintrusive optical measurements of aircraft engine exhaust emissions and comparison with standard intrusive techniques. , 2000, Applied optics.

[13]  Bernhard Lechner,et al.  Comparison of remote sensing techniques for measurements of aircraft emissions indices at airports , 2004, SPIE Remote Sensing.