D. B. Barker

Publications (4)1.41 Total impact

• Article: Preliminary results from the University of Denver infrared spectrometer - 1977 intertropical convergence zone experiment

  D. B. Barker, D. G. Murcray, W. J. Williams, A. Goldman
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  ABSTRACT: The Denver University Infrared Spectrometer (DUIRS) is a liquid-helium-cooled emission radiometer designed to study minor atmospheric constituents. DUIRS flew on 12 data flights during the 1977 Intertropical Convergence Zone experiment. No data were obtained on the flight from Wallops Island to Panama because of a power failure or on the return flight to Wallops Island because of a cryogen line freeze-up. The data coverage on the nine vertical profile flights that were flown before the freeze-up are shown. Typical spectra and variations as a function of U-2 (research aircraft) altitude are also shown. Radio metric data and rawinsonde temperature data were used to perform band model calculations to obtain molecular number densities in the column above the aircraft at each altitude.
  07/1979;
• Article: Measurements of constituents of interest in the photochemistry of the ozone layer using infrared techniques

  D. G. Murcray, J. W. Williams, D. B. Barker, A. Goldman, C. Bradford, G. Cook
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  ABSTRACT: Infrared solar spectra and infrared atmospheric emission spectra were obtained from the ground, from aircraft and from balloons. The initial detection of most stratospheric molecules was achieved by the solar spectral technique because better resolution helps remove interference from other molecules. Because the sun is an intense source of radiation, the resolution which can be obtained with good signal-to-noise, is greater than with atmospheric emission spectroscopy. Data are generally taken using a method that enhances the number of molecules in the optical path i.e. at large solar zenith angles for solar spectra and at low elevation angles for atmospheric emission spectra. The search for molecules which are predicted to be present but which, the detection of a molecule known to be present from other measurement techniques but observed for the first time in infrared solar spectra, and some further data on the variability of HNO3 are discussed.
  02/1978;
• Article: Remote sensing of trace constituents from atmospheric infrared emission and absorption spectra

  D. B. Barker, J N Brooks, A. Goldman, J. J. Kosters, D. G. Murcray, F. H. Murcray, J. Van Allen, W. J. Williams
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  ABSTRACT: Atmospheric infrared emission and absorption spectra obtained from aircraft and balloon-borne spectrometers are presented. From such spectra, mixing ratio vs altitude profiles are derived for several minor constituents. Recent results for HNO3, CF2Cl2, CFCl3, and HF are presented. In addition, the feasibility of infrared detection of other trace constituents, such as HCl, HF, NH3, NO and SO2, against the rest of the atmospheric background is studied. From this study, made on a line-by-line basis for 'state of the art' airborne spectrometers, potential spectral features for detection of the trace constituents are isolated.
  02/1976;
• Article: A KRS-5 Vacuum Window at 77 K.

  J N Brooks, D B Barker
  Applied Optics 11/1969; 8(11). · 1.41 Impact Factor