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  • 1
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    Unknown
    Investigation of electrical noise in selenium-immersed thermistor bolometers (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The selenium immersed, thermistor bolometer, IR detector failed due to spurious and escalating electrical noise outburst as a function of time at elevated temperatures during routine ground based testing in a space simulated environment. Spectrographic analysis of failed bolometers revealed selenium pure zones in the insulating selenium arsenic (Se-As) glass film which surrounds the active sintered Mn, Ni, Co oxide flake. The selenium pure film was identified as a potentially serious failure mechanism. Significant changes were instituted in the manufacturing techniques along with more stringent process controls which eliminated the selenium pure film and successfully produced 22study bolometers.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-82001
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Static coefficient test method and apparatus (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The static coefficient of friction between contacting surfaces of a plurality of bodies is determined by applying a load to the bodies in a direction normal to the contacting surfaces. Opposite ends of a flexible filament are connected to a load cell and the first of the bodies. A motor continuously moves the second of the bodies away from the load cell at constant velocity at right angles to the force of the normal load so that the first body moves intermittently relative to the second body across a contact surface between them. The load on the surfaces, the nature of the surfaces, and the speed of the first body relative to the load cell are such that the filament is alternately and cyclically tensioned and relaxed as the movement occurs. The maximum tension occurs at the incipient stages of movement of the first body relative to the second body. The load cell derives a series of measurements which are coupled to an x-y recorder, from which the maximum forces of the filament are determined to enable the static coefficient of friction to be determined. From the maximum forces and the normal force, the coefficient is determined. For determining coefficients of friction where there are large compression loads, the normal load is applied with a calibrated compression spring that is deflected by a predetermined amount determined by a spring load vs. deflection calibration curve.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Thermal and radiation stability of thin-film cermet resistive elements (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Thermal and radiation stability of thin films cermet resistive elements with silicon monoxide
    Keywords: MATERIALS, METALLIC
    Type: NASA-TM-X-63639 , X-735-69-333
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Apparatus for measuring static coefficient of friction under compressive loads (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Device includes load cell attached to rigid structure. Crosshead directly beneath cell is connected to constant-speed electrical motor. Crossarm supported by crosshead serves as platform on which bodies are tested. Test data are recorded on X-Y recorder which is connected to load cell and motor.
    Keywords: MECHANICS
    Type: GSC-11893
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    Thermal and radiation stability of thin-film cermet resistive elements (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Thin film cermet resistive elements physical controls electrical properties, physical controls, thermal and radiation stability
    Keywords: ELECTRONIC EQUIPMENT
    Type: ; TROPHYSICAL JOURNAL|ANNUAL CONFERENCE ON NUCLEAR AND SPACE RADIATION EFFECTS; Jul 21, 1970 - Jul 23, 1970; LA JOLLA, CA
    Format: text
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    NASA TECHNICAL REPORTS
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