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  • 1
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    Three‐terminal shielded resistors for fast electrometers (1974)
    American Institute of Physics
    Details
    Publication Date: 1974-06-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Rocket-borne time-of-flight mass spectrometry (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Theoretical and numerical analyses are made of planar, cylindrical and spherical-electrode two-field time-of-flight mass spectrometers in order to optimize their operating conditions. A method is introduced which can improve the resolving power of these instruments by a factor of 7.5. Potential barrier gating in time-of-flight mass spectrometers is also analyzed. Experimental studies of a miniature cylindrical-electrode and a hemispherical-electrode time-of-flight mass spectrometer are presented. Their sensitivity and ability to operate at D-region pressures with an open source make them ideal instruments for D-region ion composition measurements. A sounding rocket experiment package carrying a cylindrical electrode time-of-flight mass spectrometer was launched. The data indicate that essentially 100% of the positive electric charge on positive ions is carried by ions with mass-to-charge ratios greater than 500 below an altitude of 92 km. These heavy charge carriers were present at altitudes up to about 100 km.
    Keywords: GEOPHYSICS
    Type: NASA-CR-148504 , PSU-IRL-SCI-444
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Three-terminal shielded resistors for fast electrometers (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The design of electrometer feedback resistors for use at frequencies up to the kilohertz range is discussed. It is shown experimentally that the addition of capacitive coupling between the electrometer output and the center of the feedback resistor, combined with suitable shielding, gives substantially better performance at high frequencies than is obtainable with more conventional designs.
    Keywords: ELECTRONIC EQUIPMENT
    Type: Review of Scientific Instruments; 45; June 197
    Format: text
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    NASA TECHNICAL REPORTS
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