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LIQUID HELIUM LEVEL METER BY USING SUPERCONDUCTING WIRE TWO STEPS PULSE CURRENT MEASUREMENT.

Author(s) : KURAOKA Y.

Summary

IT IS WELL KNOWN HOW TO MEASURE THE LEVEL OF LIQUID HELIUM SURFACE BY USING A SUPERCONDUCTING WIRE. HOWEVER, THERE ARE TWO DIFFICULTIES IN THIS METHOD. ONE IS DUE TO DEVIATION OF THE ELECTRICAL RESISTIVITY WHICH DEPENDS ON SELF-HEATING OF THE WIRE. ANOTHER IS DUE TO THE FLUCTUATION OF THE PLATEAU REGION IN CURRENT-VOLTAGE CURVE OF THIS WIRE WHEN THE TEMPERATURE OF HELIUM BATH HAS CHANGED OR EVAPORATION RATE OF LIQUID HELIUM HAS CHANGED. THESE DIFFICULTIES HAVE BEEN SURMOUNTED BY USING THE NEW METHOD OF < TWO STEPS PULSE CURRENT MEASUREMENT >, WHICH MAKES USE OF THE PROPERTIES OF RETURN CURVE IN CURRENT-VOLTAGE HYSTERESIS LOOP.

Details

  • Original title: LIQUID HELIUM LEVEL METER BY USING SUPERCONDUCTING WIRE TWO STEPS PULSE CURRENT MEASUREMENT.
  • Record ID : 1981-1079
  • Languages: English
  • Publication date: 1980/06/03
  • Source: Source: Proc. ICEC 8, Genes
    456-460; 6 fig.; 1 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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