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  • INSTRUMENTATION AND PHOTOGRAPHY  (308)
  • FLUID MECHANICS AND HEAT TRANSFER
  • 1970-1974  (325)
Collection
Keywords
Years
Year
  • 1
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    Alpha-particle spectrometer experiment (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Observation of lunar radon emanation during the Apollo 15 and 16 missions shows the existence of areas with locally high emanation rates. The most conspicuous Rn-222 feature found in the data analysis is a region that includes Aristarchus Crater. The excess emanating power of the Aristarchus region may be an indication of internal activity at that site. There are regions with anomalously high rates of Po-210 activity, which indicates transient phenomena involving the release of Rn-222 gas from certain areas of the moon.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Lyndon B. Johnson Space Center Apollo 16 Prelim. Sci. Rept.; 6 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Computerized micromechanical testing (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Materials microstrain determination using automatic capacitance bridge gage and analog or hybrid computer for measurement signal processing
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Relation of measured outgassing pressures to surface adsorption in satellite borne pressure gauges (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Outgassing pressure variation with time near perigee in satellite-borne pressure gages, using Langmuir model of surface adsorption
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Balloon-based measurements of the cosmic background radiation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A balloon-borne liquid-helium-cooled spectrometer was developed and flown to measure the cosmic background radiation in the 3- to 18-per-cm region. It features a cooled horn antenna, a polarizing Michelson interferometer, and a germanium bolometer. These design features and the performance of the instrument are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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    NASA TECHNICAL REPORTS
  • 5
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    Investigation of the use of microwave image line integrated circuits for use in radiometers and other microwave devices in X-band and above (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Program results are described in which the use of a/high permittivity rectangular dielectric image waveguide has been investigated for use in microwave and millimeter wavelength circuits. Launchers from rectangular metal waveguide to image waveguide are described. Theoretical and experimental evaluations of the radiation from curved image waveguides are given. Measurements of attenuation due to conductor and dielectric losses, adhesives, and gaps between the dielectric waveguide and the image plane are included. Various passive components are described and evaluations given. Investigations of various techniques for fabrication of image waveguide circuits using ceramic waveguides are also presented. Program results support the evaluation of the image line approach as an advantageous method for realizing low loss integrated electronic circuits for X-band and above.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-112107
    Format: application/pdf
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  • 6
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    Comparison of two gas chromatograph models and analysis of binary data (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The overall objective of the gas chromatograph system studies is to generate fundamental design criteria and techniques to be used in the optimum design of the system. The particular tasks currently being undertaken are the comparison of two mathematical models of the chromatograph and the analysis of binary system data. The predictions of two mathematical models, an equilibrium absorption model and a non-equilibrium absorption model exhibit the same weaknesses in their inability to predict chromatogram spreading for certain systems. The analysis of binary data using the equilibrium absorption model confirms that, for the systems considered, superposition of predicted single component behaviors is a first order representation of actual binary data. Composition effects produce non-idealities which limit the rigorous validity of superposition.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-127911 , RPI-MP-27
    Format: application/pdf
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  • 7
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    Classification of spatially unresolved objects (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A proportion estimation technique for classification of multispectral scanner images is reported that uses data point averaging to extract and compute estimated proportions for a single average data point to classify spatial unresolved areas. Example extraction calculations of spectral signatures for bare soil, weeds, alfalfa, and barley prove quite accurate.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Rev., Vol. 2; 13 p
    Format: application/pdf
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  • 8
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    The Apollo X-ray fluorescence spectrometer (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Apollo X-ray fluorescence spectrometer was a part of a geochemical package flown on the Apollo 15 and 16 missions. The device was to map the concentrations of aluminum, magnesium, and silicon in the lunar regolith along the spacecraft ground track. A functional description of the spectrometer is given and the telemetry data format is discussed together with the pulse height analyzer, the pulse shape discriminator, questions of in-flight calibration, and the flight results.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 9
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    Drift in interference filters. I (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Studies of narrow-band interference filters have shown that two mechanisms exist that cause drift to shorter wavelengths. One is dependent on the thermal history of the filter, and the other depends on the radiation history. The present paper presents experimental results on thermal effects; and it is shown that by a proper bake cycle, ZnS-cryolite filters are stable for years if stored at less than 38 C.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; Nov. 197
    Format: text
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  • 10
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    Real-time incoherent-to-coherent optical converter (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Description of a real-time incoherent-to-coherent optical converter designed for application in image processing systems. The converter utilizes the photoconductivity effect of the compound Bi(12)SiO(20) for spatial modulation of electrical polarization in the compound. An optically absorbed write-in image is stored as an image polarization pattern in the device. Readout is effectuated electrooptically by using phase retardation in a polarized coherent light beam during the passage through the crystal. The operating mode required for achieving continuous image conversion with a high-speed recyclability is discussed. The performance characteristics of the converter are given and the fabrication technology is described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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