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  • NONMETALLIC MATERIALS  (3)
  • OPTICS  (1)
  • 1975-1979  (4)
  • 1
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    Unknown
    Pressure sensing of the atmosphere by solar occultation using broadband CO2 absorption (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A technique for obtaining pressure at the tangent point in an IR solar occulation experiment is described. By measuring IR absorption in bands of atmospheric CO2 (e.g., 2.0, 2.7, or 4.3 microns), mean pressure values for each tangent point layer (vertical thickness 2 km or less) of the atmosphere can be obtained with rms errors of less than 3%. The simultaneous retrieval of pressure and gas concentration in a remote-sensing experiment will increase the accuracy of inverted gas concentrations and minimize the dependence of the experiment on pressure or mass path error resulting from use of climatological pressure data, satellite ephemeris, and instrument pointing accuracy.
    Keywords: OPTICS
    Type: Applied Optics; 18; June 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Qualification of black electrically conductive paint (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A paint having low electrical resistance has been developed. Using a low outgassing polyurethane resin, specific amounts of conductive carbon particles were added to produce paint compositions having a range of electrical resistance. Methods of testing for electrical resistance are discussed. The adhesion of these paints has been tested successfully over the temperature range from liquid nitrogen temperature up to 80 C (176 F).
    Keywords: NONMETALLIC MATERIALS
    Type: New horizons - Materials and processes for the eighties; Nov 13, 1979 - Nov 15, 1979; Boston, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Techniques used for limiting degradation products of polymeric materials for use in the space environment (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Techniques are discussed for limiting or controlling the degradation products (outgassing) of polymeric materials in the space environment. One technique, now ASTM E-595-77, is used to screen out those materials which lose greater than 1% Total Mass Loss when in vacuum for 24 hours at 125 C and which have more than 0.10% Collected Volatile Condensable Materials condensing on a collector surface at 25 C. Examples of silicone materials which are high and low in outgassing are given. The numerous mechanical motions in spacecraft experiments require liquid lubricants which also might degrade in space. Labyrinth seals and barrier films are utilized to limit the degradation of or from these lubricants. A recoverable in-flight experiment has been proposed for making definitive measurements of how effective these techniques are in limiting the amounts and escape paths of outgassed molecules.
    Keywords: NONMETALLIC MATERIALS
    Type: Conference on the Environmental degradation of engineering materials; Oct 10, 1977 - Oct 12, 1977; Blacksburg, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Materials testing for spacecraft use (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A technique has been developed for determining the outgassing characteristics of materials intended for spacecraft use. A measurement of the total mass loss (TML) and of the collected volatile condensable materials (CVCM) is used as a guide for selecting those materials low in outgassing. The data were used to compare the outgassing from two conductive black paints. In addition, the apparatus was also used in an attempt to simulate expected launch temperatures by collecting the outgassed molecules on a glass plate, which simulates a nearby thermal control surface. The glass plate was then irradiated in vacuum by simulated sunlight. Transmittance patterns of the clean glass plate and also with the condensed material on it were compared with the transmittance pattern after irradiation of the condensate. The transmittance patterns showed a drastic change. The resultant discoloration indicated the detrimental effects of the contamination and aided in selecting the better conductive paint. Additional tests utilizing an aluminized mirror collector plate have been run to show the effect of irradiation upon the CVCM from certain different classes of materials often used on spacecraft.
    Keywords: NONMETALLIC MATERIALS
    Type: The enigma of the eighties: Environment, economics, energy; Twenty-fourth National Symposium and Exhibition; May 08, 1979 - May 10, 1979; San Francisco, CA
    Format: text
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    NASA TECHNICAL REPORTS
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