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  • 1
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    Inflight resistance measurement on high-T(sub c) superconducting thin films exposed to orbital atomic oxygen on CONCAP-2 (STS-46) (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In 1992, UAH (University of Alabama in Huntsville) conducted a unique experiment on STS-46 in which YBa2Cu3O7 (commonly known as '1-2-3' superconductor) high-T(c) superconducting thin film samples prepared at three different laboratories were exposed to 5 eV atomic oxygen in low Earth orbit on the ambient and 320 C hot plate during the first flight of the CONCAP-2 (Complex Autonomous Payload) experiment carrier. The resistance of the thin films was measured in flight during the atomic oxygen exposure and heating cycle. Superconducting properties were measured in the laboratory before and after the flight by the individual experimenters. Films with good superconducting properties, and which were exposed to the oxygen flux, survived the flight including those heated to 320 C (600 K) with properties essentially unchanged, while other samples which were heated but not exposed to oxygen were degraded. The properties of other flight controls held at ambient temperature appear unchanged and indistinguishable from those of ground controls, whether exposed to oxygen or not.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Langley Research Center, LDEF: 69 Months in Space. Third Post-Retrieval Symposium, Part 3; p 971-988
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Measurement of the Relative and Absolute Microgravity Environment of Space Platforms, Recent Flight Results, and Determination of the Spatial Microgravity Field (1992)
    In:  CASI
    Details
    Publication Date: 2014-09-03
    Description: Microgravity material processing in space, such as crystal growth, requires specific and accurate knowledge of the very low frequency, very low level microgravity. This means knowledge of absolute microgravity levels. Most acceleration measurement systems for space platforms only measure 'microvibrations,' the measurement of the absolute microgravity level being severely corrupted by bias errors, temperature hysteresis, nonlinearity by-products, and bias changes due to launch vibrations. An advanced system was developed incorporating a fixed 3-axis acceleration measurement system with improved signal conditioning and Invertible Accelerometers for absolute measurements. The higher sensitivity channels have lower frequency low pass filtering to meet crystal growers demands for recording of low level/low frequency disturbances. Also included is a pre-flight bias adjustment feature.
    Keywords: MATERIALS PROCESSING
    Type: NASA, Washington, NASA(DOD Flight Experiments Technical Interchange Meeting Proceedings; 19 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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