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  • INSTRUMENTATION AND PHOTOGRAPHY  (4)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (2)
  • SPACE SCIENCES
  • 1975-1979  (6)
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  • 1
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    Processing laser velocimeter high-speed burst counter data (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The statistical calculations of the mean and potential bias errors are considered with respect to their applicability to the randomly sampled velocity data obtained from a laser velocimeter. Techniques for displaying the resulting data in the form of arrow plots, flow streamline plots, and contour maps are also discussed. A description is presented of the operation of a new hardware interface between the signal processing electronics and the computer. The interface has been constructed to make it possible to use recently developed data processing techniques for obtaining turbulent power spectra from laser velocimeter data. Additional capabilities which were built into the interface allow the measurement of the velocity vector for each particle passing through the laser velocimeter sample window. By processing the data with extended versions of the turbulent power spectra techniques, cross spectra, interactions between velocity magnitude fluctuations, and flow angle fluctuations may be investigated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Workshop on Laser Velocimetry; Jul 11, 1978 - Jul 13, 1978; West Lafayette, IN
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The potential of carbon fiber induced shock hazards in household toasters (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The average exposure to carbon fibers which produced a short and potential shock hazard in a household toaster was determined. Toasters are normally in the off state. They are used for brief periods during the day and have timed cycles during which power is applied. The possibility of a short occurring from the heating element to the case was investigated to find the exposure levels at which a potential shock hazard could appear. The short produced was tested to determine its importance.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-159147
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Vulnerability of Quick Disconnect Connectors to Carbon Fibers (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Unprotected quick disconnect electrical connectors were exposed to fibers of 3mm, 7mm, and 12mm lengths. The average exposure to failure was determined. Results indicate that when the fiber length divided by the airgap is less than one, multiple fibers are required to bridge the gap, and the exposure time to failure rises rapidly.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-158999
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Measurement of flow fields in a large transonic wind tunnel using a laser velocimeter (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: An investigation to determine the feasibility of using a laser velocimeter for measuring the mean flow velocities about airplane models in the Langley 16-foot transonic tunnel has recently been completed. The laser velocimeter was a two-component fringe-type used in the back scatter mode. The tunnel airflow was seeded with oil droplets to provide scattering sources for the laser velocimeter. Measurements of the tunnel free-stream velocity were in good agreement with the tunnel calibration, and measurements of the velocity along the stagnating streamline of a hemisphere model, when adjusted for particle lag, were in good agreement with theoretical predictions. The study showed that the laser, optics, and electronics system operated satisfactorily, but that further development is required to reduce scattering particle size and substance accumulation in the tunnel.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 75-1425 , General Aviation Technologyfest; Nov. 13, 14, 1975; Wichita, Kan.
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Laser velocimeter measurements in a large transonic wind tunnel (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A two-component fringe type laser velocimeter operated in the backscatter mode was used to measure the free-stream velocity in an undisturbed flow field in a wind-tunnel test section from Mach 0.2 to Mach 1.0 and to measure the velocity along the stagnating streamline of a hemisphere model from Mach 0.2 to Mach 0.8. Burst signals from the laser velocimeter were processed by high-speed burst counters, and histograms of the number of occurrences of a particular counter output were collected by means of a pulse height analyzer. Arithmetic means of the histograms were calculated, and the results were compared with predicted local gas velocities with allowance for the lag of the scattering particles with respect to the gas flow. The free-stream measurements were accurate to within 2% of the calibration measurements. The stagnation streamline measurements show trends similar to theoretical predictions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Minnesota Symposium on Laser Anemometry; Oct 22, 1975 - Oct 24, 1975; Bloomington, MN
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Laser velocimetry with diode junctions semiconductor lasers (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Measurements of mean and fluctuating axial velocity have for the first time been made in a seeded pipe flow with a semiconductor laser velocimeter. Several compact velocimeters have been constructed using laser diodes. While the intended applications have restricted the final instrument to operate in a coaxial backscatter mode, operation has been demonstrated in forward and side scattering modes. In all cases the instrument could be classed as dual beam. An instrument has been constructed to be installed in a model airfoil and will be mechanically driven to measure the flow over a 75-mm chord distance. The instrument occupies a volume measuring 100 mm x 100 mm x 40 mm. The compactness has been aided by using an avalanche photodiode instead of a photomultiplier tube.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Electro-Optics/Laser Conference and Exposition; Sep 19, 1978 - Sep 21, 1978; Boston, MA
    Format: text
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    NASA TECHNICAL REPORTS
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