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  • INSTRUMENTATION AND PHOTOGRAPHY  (91)
  • MATERIALS, METALLIC  (42)
  • 2020-2020
  • 1980-1984
  • 1970-1974  (133)
  • 1973  (133)
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  • 2020-2020
  • 1980-1984
  • 1970-1974  (133)
Year
  • 1
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    PAET, an entry probe experiment in the earth's atmosphere. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Description of the instrumentation of a probe designed for atmospheric studies on other planets and designated PAET. The probe was launched on June 20, 1971, near Bermuda in a trial experiment for measurements of the structure and composition of the terrestrial atmosphere. The instrumentation included accelerometers, pressure and temperature sensors, a mass spectrometer, and a radiometer. The measurements, carried out during the descent of the probe from an altitude of 90 km into the sea, were a success.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Icarus; 18; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The color bar phase meter: A simple and economical method for calibrating crystal oscillators (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Comparison of crystal oscillators to the rubidium stabilized color burst is made easy and inexpensive by use of the color bar phase meter. Required equipment consists of an unmodified color TV receiver, a color bar synthesizer and a stop watch (a wrist watch or clock with sweep second hand may be used with reduced precision). Measurement precision of 1 x 10 to the minus 10th power can be realized in measurement times of less than two minutes. If the color bar synthesizer were commercially available, user cost should be less than $200.00, exclusive of the TV receiver. Parts cost for the color bar synthesizer which translates the crystal oscillator frequency to 3.579MHz and modulates the received RF signal before it is fed to the receiver antenna terminals is about $25.00. A more sophisticated automated version, with precision of 1 x 10 to the minus 11th power would cost about twice as much.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Proc. of the 5th Ann. NASA and DOD Precise Time and Time Interval Planning Meeting; p 503-504
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    NASA TECHNICAL REPORTS
  • 3
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    Spectrophotometric results from the Copernicus satellite. I - Instrumentation and performance. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Princeton telescope-spectrometer on the OAO spacecraft Copernicus scans stellar spectra with a resolution of about 0.05 A between 950 and 1450 A, and twice this in first order between 1650 and 3000 A. The pointing during several minutes is steady within .02 sec, and the measured photometric precision in the shorter wavelength range is limited only by the statistics of photon counts, with 14-sec counts of about 1000 on an unreddened B1 star, m(v) = 5.0, at 1100 A. In the 1650-3000 A wavelength range, phototube noise resulting from cosmic rays makes observations difficult on stars fainter than m(v) = 3.0.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astrophysical Journal; 181; May 1
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    NASA TECHNICAL REPORTS
  • 4
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    Design, fabrication and testing of a 5-Hz acoustic exciter system (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A 5-Hz acoustic excitation system was designed, fabricated and checked out for use in the modulation of a stagnant gas volume contained in an absorption cell. A detailed system description of the test equipment, both mechanical and electronic, and an operating procedure are included. Conclusions are also presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-124269 , T1046F
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    NASA TECHNICAL REPORTS
  • 5
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    Thermal design and testing of the Apollo 17 lunar traverse gravimeter. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 73-771 , Thermophysics Conference; Jul 16, 1973 - Jul 18, 1973; Palm Springs, CA
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    NASA TECHNICAL REPORTS
  • 6
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    Effect of diffusional creep on particle morphology of polycrystalline alloys strengthened by second phase particles (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Diffusional creep in a polycrystalline alloy containing second-phase particles can disrupt the particle morphology. For alloys which depend on the particle distribution for strength, changes in the particle morphology can affect the mechanical properties. Recent observations of diffusional creep in alloys containing soluble particles (gamma-prime strengthened Ni base alloys) and inert particles have been reexamined in light of the basic mechanisms of diffusional creep, and a generalized model of this effect is proposed. The model indicates that diffusional creep will generally result in particle-free regions in the vicinity of grain boundaries serving as net vacancy sources. The factors which control the changes in second-phase morphology have been identified, and methods of reducing the effects of diffusional creep are suggested.
    Keywords: MATERIALS, METALLIC
    Type: NASA-TN-D-7177 , E-7248
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    NASA TECHNICAL REPORTS
  • 7
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    Effects of high temperature brazing and thermal cycling on mechanical properties of Hastelloy X. (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Data are presented on the effects of brazing alloy, brazing operation, thermal cycling, and combinations of these on the yield strength, elongation, ultimate tensile strength, and fatigue life of thin gage Hastelloy X. These data show that brazing with a Ni-Pd-Au alloy at 1461 K resulted in reductions of 35 percent in yield strength and elongation, 6 percent in ultimate tensile strength, and 18 percent in fatigue limit of Hastelloy X, as compared with as-received material. Subsequent exposure to 200 thermal cycles between 533 K and 1144 K after brazing caused further losses of 4 percent in yield strength, 8 percent in ultimate tensile strength, and 6 percent in fatigue limit.
    Keywords: MATERIALS, METALLIC
    Type: NASA-TM-X-2704 , L-8561
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    NASA TECHNICAL REPORTS
  • 8
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    The Hat Creek millimeter-wave interferometer. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A fixed-baseline millimeter-wave interferometer, operating initially at 13.5 mm, has been put into operation at the Hat Creek Observatory as the first step in the development of a two-element aperture synthesis telescope. The first system consists of a 3-m antenna and a 6-m antenna spaced 265 m apart. Large receiver bandwidths may be used at high frequencies, and this system employs an intermediate frequency bandwidth of about 400 MHz. The instrument has been used to derive accurate absolute positions of interstellar water vapor sources, to study Mercury, Venus, and Mars, and to make crude maps of a few complex continuum sources. The synthesis telescope, the next stage, has two 6-m antennas which can be located at various stations on a T-shaped track. The east-west leg is 300 m and the north-south leg is 200 m, permitting full synthesis for sources on the equator and at declinations as low as -30 deg as well as at high declinations.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE; vol. 61
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Formulation of image quality prediction criteria for the Viking lander camera (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Image quality criteria are defined and mathematically formulated for the prediction computer program which is to be developed for the Viking lander imaging experiment. The general objective of broad-band (black and white) imagery to resolve small spatial details and slopes is formulated as the detectability of a right-circular cone with surface properties of the surrounding terrain. The general objective of narrow-band (color and near-infrared) imagery to observe spectral characteristics if formulated as the minimum detectable albedo variation. The general goal to encompass, but not exceed, the range of the scene radiance distribution within single, commandable, camera dynamic range setting is also considered.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-2802 , L-8928
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    NASA TECHNICAL REPORTS
  • 10
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    Image analysis techniques associated with automatic data base generation. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper considers some basic problems relating to automatic data base generation from imagery, the primary emphasis being on fast and efficient automatic extraction of relevant pictorial information. Among the techniques discussed are recursive implementations of some particular types of filters which are much faster than FFT implementations, a 'sequential similarity detection' technique of implementing matched filters, and sequential linear classification of multispectral imagery. Several applications of the above techniques are presented including enhancement of underwater, aerial and radiographic imagery, detection and reconstruction of particular types of features in images, automatic picture registration and classification of multiband aerial photographs to generate thematic land use maps.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 73-430 , Computer Network Systems Conference; Apr 16, 1973 - Apr 18, 1973; Huntsville, AL
    Format: text
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