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  • 1975-1979  (3)
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  • 1
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    Measurements of NH3 absorption coefficients with a C-13/O-16/2 laser (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Measurements of NH3 absorption coefficients are presented for several transitions of a C-13(O-16)2 laser for small concentrations of NH3(p less than 1 torr) for absorption lines broadened to 1 atm with N2. NH3 absorption coefficients were determined for laser transitions R(8)(920.2194 wavelengths/cm) to R(28)(933.8808 wavelengths/cm) of the 00 1 - (10 0,02 0)I band. The strongest absorption coefficient K = 36.09 + or - 1.43 per (atm-cm) was measured for the R(18) transition for the NH3 line, aQ(6,6), and is larger than has been found in any previous measurements with a CO2 laser. The dependence of K on total pressure was also obtained for select transitions, and the frequency separation between the R(18) laser transition and the neighboring NH3 line aQ(6,6) was determined to be 550 + or - 50 MHz. These results are significant for long path absorption monitoring of NH3 with CO2 lasers since the path length can be reduced by approximately 40% and for heterodyne detection of NH3 since the relative position of the laser transition to the NH3 absorption line is well within the bandpass of Hg-Cd-Te photomixers.
    Keywords: GEOPHYSICS
    Type: Applied Optics; 14; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Ozone monitoring with an infrared heterodyne radiometer (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements of the total burden and of the concentration-versus-altitude profiles of ozone have been made with a ground-based heterodyne radiometer at Pasadena, California. The measurements were made in the 9.5-micron wavelength region, where a strong ozone infrared absorption band exists. The radiometer measured solar absorption at selected wavelengths with a spectral resolution of 0.001 reciprocal centimeter, equivalent to the half-width of an ozone absorption line at the 10-millibar altitude level. A carbon dioxide laser served as the local oscillator. This technique can be used to gather important data on both tropospheric and stratospheric ozone, which are not readily accessible with other remote-sensing techniques.
    Keywords: GEOPHYSICS
    Type: Science; 197; Sept. 23
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Remote sensing of atmospheric pollutant gases using an infrared heterodyne spectrometer (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Remote sensing of the concentration and vertical distribution of atmospheric gases using an infrared heterodyne spectrometer (IHS) has been investigated, and a dual (C-13)(O-16)2 laser multichannel IHS has been developed. Analyses of nadir thermal-radiance measurements from an aircraft at 10-km altitude and of solar absorption measurements from the ground indicate that initial applications of the IHS to tropospheric measurements of NH3 and O3 are feasible with measurement precisions ranging from 0.5 to 2 ppb and 20 to 30 ppb, respectively. These analyses have included effects of potential retrieval-error sources and have resulted in specifications of measurement modes, optimum signature lines, required system parameters, and expected sensitivities. Preliminary instrument performance data are presented.
    Keywords: ENVIRONMENT POLLUTION
    Type: International Conference on Environmental Sensing and Assessment; Sep 14, 1975 - Sep 19, 1975; Las Vegas, NV
    Format: text
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    NASA TECHNICAL REPORTS
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