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  • Physics  (486)
  • Industrial Chemistry  (394)
  • INSTRUMENTATION AND PHOTOGRAPHY  (384)
  • 1970-1974  (1,264)
  • 1965-1969
  • 1974  (1,264)
Collection
Keywords
Publisher
Years
  • 1970-1974  (1,264)
  • 1965-1969
Year
  • 1
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    Automated analysis of video data (1974)
    In:  CASI
    Details
    Publication Date: 2006-05-07
    Description: A software/hardware system designed and developed to perform automated video imagery analysis is described. Major elements included in the analysis system are: (1) sampling oscilloscope; (2) programmable trigger unit; (3) central computer; and (4) software processing library. The function of the scope and trigger unit, in conjunction with the control computer, is to digitize the selected portion of the video image and store as amplitude and time data in computer memory. Evaluation of the video data, analogus to interpretation of a visual image, is accomplished by the processing software. It is indicated that this technique of video image analysis is applicable to a wide variety of nonaerospace applications involving video data and image analysis.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Chamber of Commerce Proc. of the 1st 1974 Technol. Transfer Conf.; p 181-188
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Apparatus for calibration of on-board instruments and laboratory modelling of rarefied plasma flows past models (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Problems of laboratory simulation of artificial earth satellite flight conditions in the ionosphere are examined, and a setup capable of reproducing the basic parameters of ion flows (with energies of 5-10 eV, energy spectrum width approximately 2x5 eV, and an intensity of 10 to the minus 8th power a/cm/2) past measurement instruments and satellite models is described. Possibilities for further improvement of the apparatus are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 282-291
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Use of conventional equipment to measure the effective perceived noise level of aircraft (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A real time, computerized, measurement method for the effective perceived noise level is reported that uses comparison of two sounds differing in level and frequency to obtain the noise intensity emitted by aircraft and to calculate human psychoacoustic annoyance reactions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: the 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 224-232
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An objective method and measuring equipment for noise control and acoustic diagnostics of motorcars (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: An objective method and apparatus for noise control and acoustic diagnostics of motorcar engines are reported. The method and apparatus let us know whether the noisiness of the vehicle under test exceeds the admissible threshold levels given by appropriate standards and if so what is the main source of the excessive noise. The method consists in measuring both the overall noise level and the sound pressure levels in definite frequency bands while the engine speed is controlled as well and may be fixed at prescribed values. Whenever the individually adjusted threshold level has been exceeded in any frequency band, a self-sustaining control signal is sent.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The 4th Natl. Conf. on Acoustics Vol. 1A (NASA-TT-F-15375); p 198-204
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Photoelectronic vibrometer with polarized light (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A seismic torsiometer is described which is based on the reception by a photosensitive transducer of a light flux modulated by a relative rotation of the optical axes of two polaroids. The torsional vibrations of the polaroid fixed to the shaft are transmitted to the other polaroid (which at the same time is the seismic mass of the apparatus) by means of elastic lamellas. The device can work as accelerometer, vibrometer or frequency meter, depending on the value of the ratio between the proper oscillation frequency of the seismic system and the measured vibration frequency.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 68-72
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Vibration and noise measuring instruments built in the RSR (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The demands placed upon vibration and noise measuring instruments are discussed. The instruments that are now being manufactured in the RSR are described, as well as those that are being made ready for manufacture, namely: the VP-3 portable vibrometer, the N2103 precision electronic vibrometer, the N2103 B sonometric preamplifier, as well as vibration transducers of the electrodynamic and piezoelectric types.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 62-67
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    NASA TECHNICAL REPORTS
  • 7
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    Contributions to the problem of piezoelectric accelerometer calibration (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: After discussing the principal calibration methods for piezoelectric accelerometers, an experimental setup for accelerometer calibration by the reciprocity method is described It is shown how the use of a lock-in voltmeter eliminates errors due to viscous damping and electrical loading.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 55-61
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Instruments for measuring radiant thermal fluxes (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: An absolute two-sided radiometer, designed on the principle of replacing absorbed radiant energy with electrical energy, is described. The sensitive element of the detector is a thermoelectric transducer of thermal flux. The fabrication technology, methods of measurement, technical characteristics, and general operation of the instrument are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 95-101
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    NASA TECHNICAL REPORTS
  • 9
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    Determination of local values of gas and liquid mass flux in highly loaded two-phase flow (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A measurement system using a deceleration probe was designed for determining the local values of gas and liquid mass flux in various gas/liquid droplet sprayfields. The system was used to characterize two-phase flowfields generated by gas/liquid rocket-motor injectors. Measurements were made at static pressures up to 500 psia and injected mass flow ratios up to 20. The measurement system can also be used at higher pressures and in gas/solid flowfields.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The neutral atmosphere temperature experiment (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The AEROS Neutral Atmosphere Temperature Experiment (NATE) is designed to measure the kinetic temperature of molecular nitrogen in the thermosphere. A quadrupole mass spectrometer tuned to N2 measures the N2 density variation in a small spherical antechamber having a knife-edged orifice which is exposed to the atmosphere at the outer surface of the spacecraft. The changing density of N2 due to the spinning motion of the spacecraft permits determination of the velocity distribution of the N2 from which the temperature is calculated. An alternate mode of operation of the instrument allows measurement of the other gases in the atmosphere as well as N2 permitting determination of the neutral particle composition of the atmosphere.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Zeitschrift fuer Geophysik; 40; 5, 19; 1974
    Format: text
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    NASA TECHNICAL REPORTS
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