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  • AERODYNAMICS  (460)
  • INSTRUMENTATION AND PHOTOGRAPHY  (249)
  • 1985-1989
  • 1975-1979  (709)
  • 1976  (709)
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Keywords
Years
  • 1985-1989
  • 1975-1979  (709)
Year
  • 1
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    A high-temperature wideband pressure transducer (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The problem of operating a condenser microphone as a terminal element of a half wavelength transmission line was dealt with; the environment in which the microphone operates necessitates a 25 foot separation from its supporting electronics. A theoretical analysis of the microphone-cable system, substantiated by laboratory tests, provided criteria to optimize system gain.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-146422 , PGSTR-PH76-24
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Atmospheric temperature profiling using an infrared heterodyne radiometer (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The applicability of a high resolution infrared heterodyne radiometer for atmospheric temperature profiling is considered. Upwelling radiation at the 754.321/cm and the 945.976/cm rotational-vibrational lines of CO2 are monitored by a six IF channel infrared heterodyne radiometer with spectral specificity between 0.002 and 0.012/cm. Computer simulated retrievals have been carried out which indicate a maximum temperature inaccuracy of 3.5 K for vertical profiles between ground level and 50 km and a system integration time of 8 seconds.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Seminar on Modern utilization of infrared technology II: Civilian and military; Aug 26, 1976 - Aug 27, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Inviscid transonic flow computations with shock fitting (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: First- and second-order numerical procedures for calculating two-dimensional transonic flows that treat shock waves as discontinuities are discussed. This short communication illustrates their application to a simple but non-trivial problem for which there are limited theoretical results.
    Keywords: AERODYNAMICS
    Type: Symposium Transsonicum II; Sep 08, 1975 - Sep 13, 1975; Goettingen
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Pressure distribution on a 1- by 3-meter semispan wing at sweep angles from 0 deg to 40 deg in subsonic flow (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A 1- by 3-meter semispan wing of taper ratio 1.0 with NACA 0012 airfoil section contours was tested in the Langley V/STOL tunnel to measure the pressure distribution at five sweep angles, 0 deg, 10 deg, 20 deg, 30 deg, and 40 deg, through an angle-of-attack range from -6 deg to 20 deg. The pressure data are presented as plots of pressure coefficients at each static-pressure tap location on the wing. Flow visualization wing-tuft photographs are also presented for a wing of 40 deg sweep. A comparison between theory and experiment using two inviscid theories and a viscous theory shows good agreement for pressure distributions, normal forces, and pitching moments for the wing at 0 deg sweep.
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-8307 , L-10969
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Correlation of full-scale helicopter rotor performance in air with model-scale Freon data (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An investigation was conducted in a transonic dynamics tunnel to measure the performance of a 1/5 scale model helicopter rotor in a Freon atmosphere. Comparisons were made between these data and full scale data obtained in air. Both the model and full scale tests were conducted at advance ratios between 0.30 and 0.40 and advancing tip Mach numbers between 0.79 and 0.95. Results show that correlation of model scale rotor performance data obtained in Freon with full scale rotor performance data in air is good with regard to data trends. Mach number effects were found to be essentially the same for the model rotor performance data obtained in Freon and the full scale rotor performance data obtained in air. It was determined that Reynolds number effects may be of the same magnitude or smaller than rotor solidity effects or blade elastic modeling in rotor aerodynamic performance testing.
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-8323 , L-10844
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    On the problem of embedding picture elements in regions (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A few new algorithms for region growing in pictures were developed. These algorithms are a step toward finding a satisfactory solution to the image segmentation problem, and in-depth understanding of the problems of nonsemantic image segmentation. The algorithms utilize a sequential decision approach for region boundaries detection. The sequential decisions are supported by a stochastic algorithm that maintains local statistics of the region near the boundaries as the region grows. A few illustrations of the algorithm's performance are included.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-148279 , JPL-TM-33-774
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A system for extracting 3-dimensional measurements from a stereo pair of TV cameras (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Obtaining accurate three-dimensional (3-D) measurement from a stereo pair of TV cameras is a task requiring camera modeling, calibration, and the matching of the two images of a real 3-D point on the two TV pictures. A system which models and calibrates the cameras and pairs the two images of a real-world point in the two pictures, either manually or automatically, was implemented. This system is operating and provides three-dimensional measurements resolution of + or - mm at distances of about 2 m.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-147149 , JPL-TM-33-769
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Particle and flow field measurements by laser holography (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Holograms make transmission recordings of aerodynamic events which are real-illuminated with ground-glass light diffusers and with no requirements for precision. The three-dimensional interferograms can be recorded by stored-beam, double-exposure, and double-plate techniques. Weak traveling shock waves, generated by rotating blade rows of an aircraft fan compressor, can be visualized by rapid double-exposure holograms recorded with a ruby laser. The same laser technique can also determine flow velocities from holograms of small flow-entrained particles. Particles larger than one-quarter millimeter are recorded under rear diffuse illumination conditions. Smaller particles can be recorded by their own forward scattering of laser light through the sensitivity of the holographic process for weak signals. Since the holographic apparatus can be path-matched, both particle and flow interferograms can be recorded with lasers of short coherence length.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Conference on The engineering uses of coherent optics; Apr 08, 1975 - Apr 11, 1975; Glasgow
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    A numerical study of viscous flow around an airfoil (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An integrodifferential method, previously formulated in terms of velocity and vorticity vectors, is reformulated in terms of stream function and vorticity for two-dimensional incompressible viscous flows. The reformulated integrodifferential method is shown to retain the distinguishing feature of the previous formulation in permitting the confinement of the solution field to the viscous region of the flow and consequently offers great computational advantages. The application of this procedure in a study of an incompressible flow around an impulsively started 9% thick symmetric Joukowski airfoil at an angle of attack of 15 deg and a Reynolds number of 1000 is discussed. Numerical results are presented and compared with available finite-difference results.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 76-337 , Fluid and Plasma Dynamics Conference; Jul 14, 1976 - Jul 16, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A digital system to produce imagery from SAR data (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes a digital processing algorithm and its associated system design for producing images from Synthetic Aperture Radar (SAR) data. The proposed system uses the Fast Fourier Transform (FFT) approach to perform the two-dimensional correlation process. The range migration problem, which is often a major obstacle to efficient processing, can be alleviated by approximating the locus of echoes from a point target by several linear segments. SAR data corresponding to each segment is correlated separately, and the results are coherently summed to produce full-resolution images. This processing approach exhibits greatly improved computation efficiency relative to conventional digital processing methods.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 76-968 , Systems Design Driven by Sensors; Oct 18, 1976 - Oct 20, 1976; Pasadena, CA
    Format: text
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    NASA TECHNICAL REPORTS
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