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  • Fluid Mechanics and Thermodynamics
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1975-1979  (222)
  • 1950-1954  (5)
  • 1977  (222)
  • 1952  (5)
Collection
Keywords
Years
  • 1975-1979  (222)
  • 1950-1954  (5)
Year
  • 1
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    Space Research Leads to Handheld X-Ray Device (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-NEWS-RELEASE-77-238 , P77-10237
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Aseptic fluid transfer system (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: A method and means is provided, which permits the transfer of fluids between separate detached containers, in a manner which preserves the sterility of the fluids during and after their transfer.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Visible infrared spin-scan radiometers (VISSR) for the Geostationary Operational Environmental Satellite (GOES) B and C application (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Two visible infrared spin scan radiometer (VISSR) instruments provided for the Geostationary Operational Environmental Satellite B and C (GOES B and C) spacecrafts are described. The instruments are identical to those supplied previously are summarized. A significant number of changes primarily involving corrections of drawing errors and omissions were also performed. All electrical changes were breadboarded (where complexity required this), were incorporated into the test module, and subjected to verification of proper operation throughout fall instrument temperature range. Evaluation of the changes also included design operating safety margins to account for component variations and life.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-170434 , NAS 1.26:170434
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Precision gravity detection - Gradiometry and/or radiometry (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Current knowledge concerning the earth's gravity field is limited to about 1500-2000 km resolution. However, the resolution of gravity anomalies having a spatial extent of 100-1000 km over the entire globe is needed for important geophysical and geodetic applications. In the near future satellite altimetry will be used to determine the ocean geoid at the 10 cm - 1 m level. In order to provide a similar level of resolutions over the land regions, there exists a need for utilizing new promising techniques such as gravity gradiometry and new radiometric measurements, viz., satellite-to-satellite tracking. Satellite-to-satellite tracking techniques have shown potential for improving the medium wavelength component of the gravity field. The gravity gradiometer has not yet been tested on board a satellite. The reported analysis includes a simplified theoretical model to compare the effectiveness of the gradiometer measurements and radiometric measurements for high resolution gravity field determination, and the direct estimation of local gravity anomalies represented by point masses using a simulated gravity gradiometer and satellite-to-satellite tracking data.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Symposium on Space Technology and Science; May 16, 1977 - May 20, 1977; Tokyo; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Obstacle detection by rapid estimation scheme with data scaling (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A data scaling technique is proposed to improve the performance of a rapid estimation scheme for analyzing rover rangefinder data in the specific area of obstacle outline characterization. The scaling transformation involves multiplying the measured beam length times a scale factor and taking the logarithm in a certain base. Although analysis shows that introducing the scaling transformation has no primary effect on the detection ability and that there is no apparent signal-to-noise ratio improvement, computer simulations show a reduction in the number of false jumps. In the 40-m range the use of data scaling cleared the foreground of obstacles of noise and obtained definition of the near edge of a crater.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Annual Pittsburgh Conference; Apr 21, 1977 - Apr 22, 1977; Pittsburgh, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Detection of upper atmospheric constituents using submillimeter wave /SMMW/ heterodyne radiometry (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Submillimeter wave heterodyne radiometry has been applied to the detection and sounding of upper atmospheric constituents. The use of room-temperature Schottky-diode mixers for the receivers has yielded measurements of 70,000 K noise temperature. Coupling losses into the diode and matching of the IF output limit are observed to limit noise temperature. The technique is evaluated by calculating spectra with assumed temperature and constituent profiles. Vertical integrations are made with a multilayer atmosphere and the direct summation of absorption coefficients for the individual spectral lines is used. Results are presented for tangent path parameters for a mid-latitude summer model and the fractional parts of upper atmospheric constituents as a function of altitude.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Far infrared/submillimeter wave: Technology/applications; Apr 18, 1977 - Apr 21, 1977; Reston, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Miniature drag force anemometer (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A miniature drag force anemometer is described which is capable of measuring dynamic velocity head and flow direction. The anemometer consists of a silicon cantilevered beam 2.5 mm long, 1.5 mm wide, and 0.25 mm thick with an integrated diffused strain gage bridge, located at the base of the beam, as the force measuring element. The dynamics of the beam are like that of a second order system with a natural frequency of about 42 kHz and a damping coefficient of 0.007. The anemometer can be used in both forward and reversed flow. Measured flow characteristics up to Mach 0.6 are presented along with application examples including turbulence measurements.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Instrumentation Symposium; May 01, 1977 - May 05, 1977; Las Vegas, NV
    Format: text
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  • 8
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    Comparison of two different raindrop disdrometers (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Different types of impact sensors, used for the measurement of drop size distribution, are described and compared. All of them generate an electrical output which is to a first order a function of the velocity and mass of impacting drops within the size range of 0.25 to 5.0 mm. The disdrometers discussed include an active styrofoam disdrometer, a passive plexiglass sensor, and a cast epoxy disdrometer sensor. The sensors are calibrated by dropping water drops of known size on the sensor, and using an oscilloscope to measure peak amplitude. Similar response characteristics are observed for the active styrofoam disdrometer and the passive plexiglass and brass sensors. The cast epoxy impact sensor is noted to have a faster response and to be more sturdy than the styrofoam or plexiglass sensors.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Conference on Radar Meteorology; Oct 26, 1976 - Oct 29, 1976; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Photographic image enhancement and processing (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Scientists using aerial imagery frequently desire image processing or enhancement of that imagery to aid them in data analysis. Sophisticated digital image processing techniques are currently employed in many applications where the data is recorded in digital format, where processing hardware and programs are available. Aerial photographic imagery poses a problem in the magnitude of the digitization processing. Photographic image processing analogous to many available digital techniques is being employed by scientific investigators. Those techniques which may be applied in a cost effective manner to processing of aerial photographic imagery are described here.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Biennial Workshop on Color aerial photography in the plant sciences and related fields; Aug 19, 1975 - Aug 21, 1975; Sioux Falls, SD
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Class of near-perfect coded apertures (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Coded aperture imaging of gamma ray sources has long promised an improvement in the sensitivity of various detector systems. The promise has remained largely unfulfilled, however, for either one of two reasons. First, the encoding/decoding method produces artifacts, which even in the absence of quantum noise, restrict the quality of the reconstructed image. This is true of most correlation-type methods. Second, if the decoding procedure is of the deconvolution variety, small terms in the transfer function of the aperture can lead to excessive noise in the reconstructed image. It is proposed to circumvent both of these problems by use of a uniformly redundant array (URA) as the coded aperture in conjunction with a special correlation decoding method.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-157632 , LA-UR-77-2369 , CONF-771023-4 , Nucl. Sci. Symp.; Oct 19, 1977; San Francisco
    Format: application/pdf
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