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  • 1
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    A tunable diode laser system for aircraft measurements of trace gases (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The advantages of tunable-diode-laser absorption spectrometry (TDLAS) for measuring trace atmospheric gases are universality, positive identification, good sensitivity, and rapid response time. A TDLAS system is described which is capable of making measurements aboard an aircraft. The instrument was employed during the Chemical Instrumentation Test and Evaluation (CITE) 2 program to measure NO2 on 11 flights and HNO3 on five flights. Detection limits were determined to be 25 parts per trillion by volume (pptv) for NO2 and 75 pptv for HNO3 with response times of 3 min. This was sufficient to permit measurements of NO2 in the free troposphere and HNO3 in the continental boundary layer a significant fraction of the time.
    Keywords: LASERS AND MASERS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 10147-10
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    The effect of water vapour broadening on methane eddy correlation flux measurements (1991)
    Springer
    Journal of atmospheric chemistry 13 (1991), S. 97-108 
    Details
    ISSN: 1573-0662
    Keywords: Methane flux ; broadening coefficient ; eddy correlation technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract A high resolution tunable diode laser absorption spectrometer (TDLAS) was used to measure the broadening effect of water vapor and other gases (dry air, nitrogen, oxygen, hydrogen and helium) on three methane lines in the v4 fundamental. The effects on methane eddy correlation flux measurements amount to a few percent for the least broadened line for expected H2O fluxes, to ≈10% for the most broadened line for higher H2O and lower CH4 fluxes likely to be encountered. The broadening coefficients of methane measured for air, N2, O2, and He are in good agreement with recently published values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048103
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    Paper (German National Licenses)
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