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  • ELECTRONICS AND ELECTRICAL ENGINEERING  (3)
  • COMPUTER OPERATIONS AND HARDWARE  (1)
  • SPACE SCIENCES  (1)
  • 1
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    Auto covariance computer (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A laser velocimeter covariance processor which calculates the auto covariance and cross covariance functions for a turbulent flow field based on Poisson sampled measurements in time from a laser velocimeter is described. The device will process a block of data that is up to 4096 data points in length and return a 512 point covariance function with 48-bit resolution along with a 512 point histogram of the interarrival times which is used to normalize the covariance function. The device is designed to interface and be controlled by a minicomputer from which the data is received and the results returned. A typical 4096 point computation takes approximately 1.5 seconds to receive the data, compute the covariance function, and return the results to the computer.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Frequency domain laser velocimeter signal processor (1986)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: A laser velocimeter frequency domain signal processor is described which utilizes smart instrumentation to configure itself to maximize measurement accuracy based on the determined characteristics of the input signals. The stystem provides the same measurement capabilities as the high-speed burst counter in instantaneous measurements of signal frequency, the same automatic gain control and automatic frequency control as the frequency tracker, and the same immunity to signal-to-noise derived errors as the photon correlator. Simulation results demonstrate measurement accuracies of better than 0.2 percent for signal frequencies up to 100 MHz.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Skylab experiment performance evaluation manual (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A series of preparation analyses used for evaluating the performance of the Skylab corollary experiments under preflight, in-flight, and postflight conditions is given. Experiment continegency plan work-around procedure and malfunction analyses are presented in order to assist in making the experiment operationally succesful.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-61386
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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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
  • 5
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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
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