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  • 1
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    Results of Pioneer 10 and 11 Meteoroid Experiments: Interplanetary and near-Saturn (1980)
    American Geophysical Union
    Details
    Publication Date: 1980-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    Space debris impact experiment (S0001) (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The specific objectives of this experiment are to establish the population and size distribution of meteoroids in the mass range from 10 to the minus 10 power to 10 to the minus 4 power G, to establish the current population of man-made debris in the same mass range, and to obtain data on the physical properties (composition and density) of meteoroids.
    Keywords: ASTROPHYSICS
    Type: Long Duration Exposure Facility (LDEF); p 136-137
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Preliminary comparison of laser and solar space power systems (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Four laser receiver systems are compared to onboard solar photovoltaic power generation for spacecraft electrical requirements. The laser photovoltaic and laser MHD receivers were found to be lighter than a comparable planar solar photovoltaic system. The laser receiver also shows less drag at lower altitudes. Panel area is also reduced for the laser receiver allowing fewer Shuttle trips for construction. Finally, it is shown that a 1 megawatt laser and receiver system might be constructed with less weight than a comparable planar solar photovoltaic system.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Impact of Saturn ring particles on Pioneer 11 (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The detection of particles near the rings of Saturn by the meteoroid detection instrument on board Pioneer 11 is discussed. The instrument consists of 234 penetration detectors, distributed between two independent data channels each of which is designed to become inhibited for a period of 77 min after the registration of a penetration event in that channel. At least four particles penetrated the detectors in the 4.5 h period around Saturn periapsis at radial distances between 1.36 and 3.1 Saturn radii, a radial distribution inconsistent with the gravitational focusing of meteoroids. The detection of particles which may have been part of the E ring before the crossing of the ring plane suggests that this ring may be 1800 km thick, with an optical thickness greater than 10 to the -8th.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 207; Jan. 25
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Results of Pioneer 10 and 11 meteoroid experiments - Interplanetary and near-Saturn (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The meteoroid penetration detectors on Pioneer 10 (channel 0) recorded 95 penetrations through the 25-micron stainless steel test material while the spacecraft was between 1 and 18 AU. The spatial density of 10 to the -9 g meteoroids is found to be essentially constant between 1 and 18 AU. The meteoroid penetration detectors on Pioneer 11 recorded 87 penetrations (55 on channel 0 and 32 on channel 1) through the 50-micron stainless steel test material while the spacecraft was between 1 and 9 AU. It is found that the meteoroids between 4 and 5 AU are not in direct circular or near-circular orbits near the ecliptic plane. The Pioneer 11 data obtained between 4 and 5 AU are best explained by the meteoroids being in randomly inclined orbits of high eccentricity. If meteoroids are in these cometlike orbits, the great increase in penetration flux previously measured near Jupiter with the Pioneer 10 experiment cannot be attributed to gravitational focusing unless the size distribution of meteoroids changes substantially between 1 and 5 AU. At Saturn encounter, the penetration flux increased by about three orders of magnitude, probably as the result of impacts from ring particles. Saturn's ring E is estimated to be 1800 km thick with an optical thickness greater than 10 to the -8.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 85; Nov. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Threshold kinetics of a solar-simulator-pumped iodine laser (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A model of the chemical kinetics of the n-C3F7I solar-simulator-pumped iodine laser is utilized to study the major kinetic processes associated with the threshold behavior of this experimental system. Excited-state diffusion to the cell wall is the dominant limiting factor below 5 torr. Excited-state diffusion to the cell wall is the dominant limiting factor below 5 torr. Excited-state recombination with the alkyl radical and quenching by the parent gas control threshold at higher pressures. Treatment of the hyperfine splitting and uncertainty in the pressure broadening are important factors in fixing the threshold level. In spite of scatter in the experimental data caused by instabilities in the simulator high-pressure high-pressure arc, reasonable agreement is achieved between the model and experiment. Model parameters arrived at are within the uncertainty range of values found in the literature.
    Keywords: LASERS AND MASERS
    Type: NASA-TP-2241 , L-15684 , NAS 1.60:2241
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Meteoroid bumper experiment on Explorer 46 (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effectiveness of a meteoroid bumper in reducing meteoroid penetrations is discussed. The bumper reduced the penetration flux by a factor of 30 and demonstrated a weight savings of a factor of 6.9 in the material needed to resist meteoroid penetration. The method of calculating the penetration flux recommended in the NASA space vehicle design criteria for meteoroid damage assessment was found to be very conservative, and changes are suggested. The optimum distribution of material between a bumper and the main wall is discussed.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AD-A277032 , NASA-TP-1879 , L-14329
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Satellites Would Transmit Power By Laser Beams (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Arrays of diode lasers concentrate power into narrow beams. Baseline design of system formulated with regard to two particular missions that differ greatly in power requirements, thus showing scalability and attributes of basic system. Satellite system features large-scale array amplifier of high efficiency, injection-locked amplifiers, coherent combination of beams, and use of advanced lithographic technology to fabricate diode lasers in array. Extremely rapid development of applicable technologies make features realizable within decade.
    Keywords: ELECTRONIC SYSTEMS
    Type: LAR-14633 , NASA Tech Briefs (ISSN 0145-319X); 19; 8; P. 42
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Laser and solar-photovoltaic space power systems comparison. II. (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A comparison of total system cost is made between solar photovoltaic and laser/receiver systems. The laser systems assume either a solar-pumped CO2 blackbody transfer laser with MHD receiver or a solar pumped liquid neodymium laser with a photovoltaic receiver. Total system costs are less for the laser systems below 300 km where drag is significant. System costs are highly dependent on altitude.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''84: Advanced energy systems - Their role in our future; Aug 19, 1984 - Aug 24, 1984; San Francisco, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Impact of Saturn Ring Particles on Pioneer 11 (1980)
    American Association for the Advancement of Science
    Details
    Publication Date: 1980-01-25
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science
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