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  • Other Sources  (115)
  • INSTRUMENTATION AND PHOTOGRAPHY  (67)
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE  (48)
  • 1985-1989  (115)
  • 1
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    The vector magnetograph of the Sayan Solar Observatory (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The problem of choosing an optimum scheme for the electrooptical analyzer of polarization and related control principles are discussed. An electrooptical deflector, which is advantageously used to employ a single photodetector and to remove systematic errors inherent in magnetographs with two photodetectors in the wings of the line is discussed, as well as adjustment errors of optical elements of the polarization analyzer and errors of control voltages. A method for measuring the telescope's polarization matrix, reduction of magnetographic measurements for instrumental polarization and calibration of magnetograph channels are examined. Questions of evaluating scattered light and of reducing magnetic field measurements are also considered as a computational procedure for the magnetic field vector parameters is briefly outlined. Computer control of the solar magnetograph and of the processing and control system software is discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields; p 231-256
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    NASA TECHNICAL REPORTS
  • 2
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    Automatic processing system for shadowgraph and interference patterns (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The design and operation of an automatic system for the processing of shadowgraph and interference images are described. The system includes a two-coordinate processing table with an optical system for the projection of transparent images onto the photodetector, an image filter in the photodetector field, and a device for controlling the movement of the table and transmitting information to the minicomputer.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-88525 , NAS 1.15:88525
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Photothermoplastic films for holographic recording (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The electrophotographic and sensitometric characteristics of poly-N-vinyl carbazole photothermoplastic films, sensitized by an amorphous-Se sublayer are examined. It is shown that the photosensitivity of the material can be improved and its spectral range can be expanded by sensitization of amorphous Se with additions of Te, As, and Sb; this can be accomplished without a significant reduction in diffraction efficiency and resolving power.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-88574 , NAS 1.15:88574
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Balloon-borne cryogenic spectrometer for measurement of lower stratospheric trace constituents (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A liquid-nitrogen cooled, multidetector Fourier transform spectrometer has been constructed to measure minor stratospheric constituents via high resolution, earth-limb emission spectroscopy from a balloon-borne platform. Cryogenic cooling, combined with the use of extrinsic silicon photoconductor detectors cooled to liquid-helium temperature, allows the detection of weak emission features of gaseous species. The spectrometer has two basic scan modes: the first mode records the continuous spectrum from 650-2100/cm with 0.2/cm resolution; the second simultaneously records four preselected narrow intervals (about 175/cm bandpass each) with 0.02/cm resolution, unapodized. Filtering of the interferogram signal is done by real-time, digital signal processing. The most important feature of this flat mirror Michelson system, with respect to remote balloon-borne operation, is the dynamic alignment system which maintains the relative parallelism of the two flat reflectors of the interferometer. Species identified to date in data obtained during a Nov. 6, 1984, flight include: CO2, O3, H2O, CH4, HNO3, N2O, NO2, NO, CCl3F (Freon-11) and CF2Cl2 (Freon-12).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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    NASA TECHNICAL REPORTS
  • 5
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    Droplet field visualization and characterization via digital image analysis (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper describes techniques that have been developed at JPL for visualization and measurements of droplet fields in a moving airstream. The techniques have been applied to a variety of problems which include simulation of heavy rain conditions in a wind tunnel, engine ingestion of wheel spray, analysis of fuel nozzle sprays and aerodynamic breakup of non-Newtonian liquids. The approach pursued here is direct imaging using a pulsed laser illumination source, followed by digital processing of photographic images. A laser double pulse technique has been used for determination of droplet velocities. Laser induced fluorescence has been used to enhance droplet definition in photographic images. The image processing software developed is capable of distinguishing between out-of-focus and in-focus drops, retaining only the latter for size determination.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 6
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    The ground effects of a powered-lift STOL aircraft during landing approach (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Attention is given to the ground proximity effects of a powered lift STOL aircraft, NASA's Quiet Short Haul Research Aircraft (QSRA); these effects have a profound influence on a landing's touchdown dispersion and sink rates, and must be determined with the greatest possible accuracy. The QSRA flight parameter values obtained by means of a small perturbation model for the trim flight condition out of ground effect, during a landing approach, are compared with flight test values, on the premise that any discrepancies between the two sets of values will be due to ground effect.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
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  • 7
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    Folding tilt rotor demonstrator feasibility study (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This study considers the modification of existing aircraft to the folding tilt rotor (FTR) design configuration, and then addresses the vehicle design requirements necessary to demonstrate the FTR concept throughout the hover/transition high-speed envelope. Three potential candidates are considered: (1) the Bell/Boeing V-22 Osprey combined with either the existing TF-34 convertible engine or a conceptual convertible engine utilizing the torque-converter-coupled fan configuration; (2) a combination of the same powerplants with a modified Lockheed S-3A Viking; and (3) the NASA/Army/BELL XV-15 airframe mated with a conceptual generic turbofan engine with a fixed-pitch fan coupled to the engine by means of a torque converter. Required aircraft modifications are identified and recommended R&D efforts for engine/rotor/airframe integration are presented.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
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  • 8
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    Flight evaluation of height response characteristics for the hover bob-up task and comparison with proposed criteria (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The CH-47B variable-stability helicopter was used to evaluate a range of height-response configurations while performing a precision hover bob-up task. The purpose of the study was to assess the validity of results obtained in previous ground-based and in-flight simulations in the context of a precision bob-up task and to provide additional flight data for inclusion in revisions to specifications for helicopter handling qualities. Height response characteristics were implemented using explicit model-following techniques, and the resulting CH-47B dynamics were validated using time-domain and frequency-domain data-analysis methods. The tests complemented the previous investigations by providing detailed pilot comments and ratings, and performance and control-utilization data that relate exclusively to the hover bob-up task. The results are compared with those from previous investigations and with new criteria that have been proposed for handling qualities requirements for helicopters.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The laser interferometer skin-friction meter - A numerical and experimental study (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Limits to the applicability of thin-film lubrication theory are established. The following two problems are considered: (1) the response of the oil film to a time-varying skin friction such as is encountered in turbulent boundary layers, and (2) a 'surface-wave instability' encountered at high skin-friction levels. Results corresponding to the first problem reveal that the laser interferometer skin-friction meter may, in principle, be applied to the measurement of instantaneous skin friction. In addressing the second problem, it is shown that the observed surface waves are not the result of a hydrodynamic instability.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Physics E - Scientific Instruments (ISSN 0022-3735); 19; 744-751
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    NASA TECHNICAL REPORTS
  • 10
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    Measurements with an airborne, autotracking, external-head sunphotometer (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Design and performance features and sample results from use of a NASA airborne tracking sunphotometer (ATS) are described. The ATS was devised to obtain continuous vertical profiles of the optical depth and transmissivity, first from a CV-990 aircraft and then from a modified DC-8 aircraft. Sample results are presented from a 1985 flight as part of the SAGE-II calibration mission, which featured detectors frequencies of 380, 450, 600, 860, 940, and 1020 microns and covered flight altitudes from ground to 10 km.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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