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  • 1975-1979  (6)
  • 1970-1974  (8)
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  • 1
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    Performance characteristics of the electrochemical concentration cell ozonesonde (1978)
    American Geophysical Union
    Details
    Publication Date: 1978-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    Electrochemical concentration cell ozonesonde performance evaluation (1977)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: A large number of electrochemical concentration cell (EDD) ozonesondes were calibrated relative to ultraviolet photometric absorption (254 nm) to determine their precision and accuracy. The average agreement with UV photometry was found to be good, but with considerable variation from one ECC ozonesonde to another. Applying individual calibrations to vertical ozone profiles reduced the systematic differences between ECC ozonesonde total ozone values and Dobson spectrophotometric determinations of the same quantity, but did not improve random differences.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center 3d NASA Weather and Climate Program Sci. Rev.; p 295-297
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Evaluation of Raman scattering as a sensor of temperature and molecular density (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The performance of the Raman scattering technique for the remote monitoring of temperature and molecular number density in various wind tunnel and engine testing facilities has been experimentally evaluated. Temperature measurements were made by monitoring the pure rotational spectrum of nitrogen and the rotational branch separations of nu2 of CF4 for temperatures in the range 300 to 1000 K. These measurements yielded an average error of 2.6 and 7.6%, respectively, for temperature measurements at pressures near 1 atm. Molecular number density measurements with 20% error could be made at densities as low as 3.5 times 10 to the 22-nd power per cu m by monitoring the 6 to 8 rotational transition of nitrogen, 3.5 times 10 to the 23-rd power per cu m by monitoring the Q-branch of the fundamental vibrational transition of nitrogen, and 7 times 10 to the 22-nd power per cu m by monitoring the nu1 fundamental vibrational transition of CF4.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Spectroscopy; 27; Nov
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Performance characteristics of the electrochemical concentration cell ozonesonde (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A large number of electrochemical concentration cell (ECC) ozonesondes were calibrated in relation to a UV photometric absorption ozone instrument prior to using the ozonesondes in atmospheric soundings. The two methods of measuring ozone were in reasonable agreement on the average, but there was considerable variation from one ozonesonde to another. Averaging the individual linear regressions gives an ECC ozone concentration equal to 0 + or - 8 nbar plus (0.96 + or - 0.10) times the concentration determined with the UV instrument, where uncertainties represent 90% confidence limits. Applying individual calibration corrections to atmospheric sounding data reduced the mean difference between Dobson spectrophotometric measurements of total ozone overburdens and corresponding values obtained from ozonesonde data from -8.5 + or - 8.2 to -1.4 + or - 7.3% for a series of measurements carried out in 1977. Corresponding uncorrected and corrected differences averaged 3.2 + or - 9.7 and 1.9 + or - 10.6%, respectively, for soundings carried out in 1976.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Nov. 20
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Performance evaluation of electrochemical concentration cell ozonesondes (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Laboratory calibrations of more than a hundred electrochemical concentration cell (ECC) ozonesondes were determined relative to UV-photometry. The average intercept and slope, 0 plus or minus 5 nb and 0.96 plus or minus 0.06, respectively, indicate reasonable agreement with UV photometry, but with considerable variation from one ECC ozonesonde to another. The time required to reach 85% of the final reaction to a step-change in ozone concentration was found to average 51 seconds. Application of the individual calibrations to 20 sets of 1976 flight data reduced the average of the differences between ozonesonde and Dobson spectrophotometric measurements of total ozone from 3.9 to 1.3%. A similar treatment of a set of 10 1977 flight records improved the average ECC-Dobson agreement from -8.5 to -1.4%. Although systematic differences were reduced, no significant effect on the random variations was evident.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-155561
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    An experimental study in the application of the Raman scattering technique as a remote sensor of gas temperature and number density in hypersonic CF4 flow. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 72-1018 , American Institute of Aeronautics and Astronautics, Aerodynamic Testing Conference; Sept. 13-15, 1972; Palo Alto, CA
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    NASA TECHNICAL REPORTS
  • 7
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    The application of laser-Raman light scattering to the determination of sulfate in sea and estuarine waters (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Laser-Raman light scattering is a technique for determining sulfate concentrations in sea and estuarine waters with apparently none of the interferences inherent in the gravimetric and titrametric methods. The Raman measurement involved the ratioing of the peak heights of an unknown sulfate concentration and a nitrate internal standard. This ratio was used to calculate the unknown sulfate concentration from a standard curve. The standard curve was derived from the Raman data on prepared nitrate-sulfate solutions. At the 99.7% confidence level, the accuracy of the Raman technique was 7 to 8.6 percent over the concentration range of the standard curve. The sulfate analyses of water samples collected at the mouth of the James River, Hampton, Virginia, demonstrated that in most cases sulfate had a constant concentration relative to salinity in this area.
    Keywords: GEOPHYSICS
    Type: NASA-CR-138124
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Remote detection of aerosol pollution by ERTS (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Photogrammetric and densitometric examination of ERTS-1 MSS imagery of eastern Virginia coupled with extensive ground truth air quality and meteorological data has shown that the identification and surveying of fixed particulate emitters (smoke plumes) is feasible. A description of the ground truth network is included. The quantitative monitoring of smoke stacks from orbital altitudes over state-size regions appears possible when tied to realistic plume models and minimal ground truth. Contrast reductions over urban areas can possibly be utilized to produce isopleths of particulates when supplemented by local measurements.
    Keywords: GEOPHYSICS
    Type: E73-10419 , NASA-CR-131209
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Use of ERTS imagery in air pollution and marine biology studies, tasks 1 through 3 (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report. The general suitability of ERTS imagery in detecting ground originated air pollution has proved to be excellent. The quality and resolution exceeded expectations and has permitted in some instances location of point sources to within a thousand feet. Suitable techniques have not yet been developed for determining or measuring area and line sources of air pollution. A major problem has been cloud cover that has persisted over the area of primary interest, the Chesapeake Bay. Work has been completed on mounting the shipboard transmissometer which will be used for investigations to relate the chlorophyll and suspended sediment content in the waters of the Lower Chesapeake Bay to ERTS-1 imagery. Water sampling, plankton analysis, and preparations for sea collection of water truth along the eastern continental shelf of the U.S. have been completed for use in comparisons with ERTS-1 data.
    Keywords: GEOPHYSICS
    Type: E72-10367 , NASA-CR-129800
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Remote detection of aerosol pollution by ERTS (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Remote detection of aerosol pollution by ERTS-1 in Eastern Virginia
    Keywords: GEOPHYSICS
    Type: E73-10134 , PAPER-E5 , NASA. Goddard Space Flight Center Environment Surveys; p 64
    Format: text
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    NASA TECHNICAL REPORTS
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