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  • Other Sources  (462)
  • METEOROLOGY AND CLIMATOLOGY  (252)
  • INSTRUMENTATION AND PHOTOGRAPHY  (210)
  • 1990-1994  (429)
  • 1960-1964  (33)
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  • Other Sources  (462)
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  • 1
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    Lidar In-space Technology Experiment (LITE) Electronics Overview (1992)
    In:  CASI
    Details
    Publication Date: 2014-09-24
    Description: The LITE electronics system consists of the following seven subsystems: Laser Transmitter Module (LTM), Boresight Assembly (BA), Aft-Optics Electronics (AOE), Digital Data Handling Unit (DDHU), Engineering Data System (EDS), Instrument Controller (IC), and the Ground Support Equipment (GSE). Each of these subsystems is discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Sixteenth International Laser Radar Conference, Part 1; p 129-132
    Format: text
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  • 2
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    Airborne wavemeter validation and calibration (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This manuscript outlines a continuing effort to validate and verify the performance of an airborne autonomous wavemeter for tuning solid state lasers to a desired wavelength. The application is measuring the vertical profiles of atmospheric water vapor using a differential absorption lidar (DIAL) technique. Improved wavemeter performance data for varying ambient temperatures are presented. This resulted when the electronic grounding and shielding were improved. The results with short pulse duration lasers are also included. These lasers show that similar performance could be obtained with lasers operating in the continuous and the pulsed domains.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Laser interferometry IV: Computer-aided interferometry; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-44185 18-35); p. 110-116.
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  • 3
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    Automatic analysis of stereoscopic satellite image pairs for determination of cloud-top height and structure (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results are presented on an automatic stereo analysis of cloud-top heights from nearly simultaneous satellite image pairs from the GOES and NOAA satellites, using a massively parallel processor computer. Comparisons of computer-derived height fields and manually analyzed fields show that the automatic analysis technique shows promise for performing routine stereo analysis in a real-time environment, providing a useful forecasting tool by augmenting observational data sets of severe thunderstorms and hurricanes. Simulations using synthetic stereo data show that it is possible to automatically resolve small-scale features such as 4000-m-diam clouds to about 1500 m in the vertical.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Applied Meteorology (ISSN 0894-8763); 30; 257-281
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  • 4
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    A maximum correlation method for image construction of IRAS survey data (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An algorithm is presented for the construction of images using linear array data with nonuniform scan coverage of object space and nonuniform detector responses. The algorithm achieves the maximum correlation between adjacent pixels, i.e., the smoothest image, consistent with the data and data uncertainties. For high spatial data density and signal-to-noise ratio, the achievable spatial resolution can exceed the diffraction limit of the optics. The capability of the algorithm is illustrated using 60-micron data from the region centered on the galaxy M101, obtained during the all-sky survey performed by the Infrared Astronomical Satellite. The 60-micron map produced has a resolution of about 36 arcsec and allows the identification of many H II regions by position and aperture photometry for the brighter ones. The achieved resolution is discussed in terms of the a priori estimate of the mean correlation length of the data, the directly measured FWHM in the final image, and the results of aperture photometry of M101 H II regions NGC 5447, 5455, 5461, 5462 and 5471.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astronomical Journal (ISSN 0004-6256); 99; 1674-168
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  • 5
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    Stable ozone layer in Norway and USSR (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Long-term column ozone density measurements have been carried out in Norway and USSR. Data from Tromso and two meridional chains in USSR are analyzed, and most of the stations show that no significant decreasing trend in ozone has occurred during the last two decades.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 1; p 254-258
    Format: application/pdf
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  • 6
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    Recalculated values of the total ozone amount over Oslo, 60 deg N, for the period 1979-1992 (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The total ozone amount over Oslo has been measured with the Dobson spectrophotometer No 56. The instrument was modified, calibrated, and intercompared in 1977 in Boulder. A new intercomparison was made in 1986 in Arosa. Much work has been done to make the zenith charts reliable. A new method has been introduced where one takes into account the change in the shape of the zenith chart curves which is caused by a change of the ozone profile when the ozone amount changes. According to the conclusion derived from the intercomparison in Arosa 1986, the instrument has not been stable. The R-N tables had to be altered, but not the Q-tables. We have tried to account for this change in our handling of the observation data. No statistical analyses of these data has yet been made, but the monthly averages of the raw data show a negative linear trend of about 4 percent for the whole period.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 1; p 211-214
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  • 7
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    A novel ozone sensor for various environmental applications (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A small, lightweight, and fast-response ozone sensor for various environmental applications is described. At a flow rate of 100 l/min(-1) the ozone sensor has a response time of significantly better than 0.1 s with a detection limit lower than 100 pptv. The ozone sensor was successfully tested in various environmental applications, i.e. in measuring directly the vertical ozone flux onto agricultural land utilizing the eddy correlation or covariance technique and in monitoring horizontal and vertical ozone profiles in the troposphere and stratosphere.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 1; p 127-129
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  • 8
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    A high speed signal processing system for a diode-pumped YAG lidar (1992)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Usually, in acquisition of the lidar echo signal, a transient recorder has been used. However, in the case of using a high-repetitive laser, such as a diode-pumped YAG laser, as a lidar light source, the acquisition speed of a transient recorder is not fast enough. A system using a sampling and direct accumulation in a clock cycle, before transferring digital data to a computer, is necessary for a fast acquisition, and a new system which equips the necessary functions was developed and is reported.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center, 16th International Laser Radar Conference, Part 2; p 537-539
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  • 9
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    A portable lidar using a diode-pumped YAG laser (1992)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: A Mie lidar system is technically established and is used for monitoring air pollution, stratospheric and boundary layer aerosol distribution, plume dispersion, visibility, and the study of atmospheric structure and cloud physics. However, a lidar system is not widely used because of its cumbersome handling and unwieldy portability. Although the author developed a laser diode lidar system based on RM-CW technique, it has a limit of measurement distance. Here we report the development of an all solid Mie lidar system using a diode-pumped Nd:YAG laser and a Si-APD detector. This was constructed as a prototype of a handy lidar system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center, 16th International Laser Radar Conference, Part 2; p 695-698
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  • 10
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    Basic studies of baroclinic flows (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Computations were completed of transition curves in the conventional annulus, including hysteresis effect. The model GEOSIM was used to compute the transition between axisymmetric flow and baroclinic wave flow in the conventional annulus experiments. Thorough testing and documentation of the GEOSIM code were also completed. The Spacelab 3 results from the Geophysical Fluid Flow Cell (GFFC) were reviewed and numerical modeling was performed of many of the cases with horizontal temperature gradients as well as heating from below, with different rates of rotation. A numerical study of the lower transition to axisymmetric flow in the baroclinic annulus was performed using GEOSIM.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA(MSFC FY91 Global Scale Atmospheric Processes Research Program Review; p 5-6
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