Simple electrical-resistance devices made of silicon indicate whether helium liquid or helium vapor present. Devices designed primarily for use in outer space, were tested and found to operate in normal Earth gravity. Silicon cubes supported by stainless-steel wires and strips. Voltage across each cube at fixed current indicates whether immersed in helium liquid or vapor. Liquid cools more than vapor does, resulting in greater electrical resistance. Such helium-liquid/vapor detectors incorporated into ducts or containers of laboratory equipment, and used to infer locations of liquid/vapor interfaces in order to measure quantities of liquid and vapor or to control refill operations.


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    Titel :

    Silicon Detectors For Helium Liquid And Vapor


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    01.08.1990



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :



    Liquid-helium temperature operation of silicon-germanium heterojunction bipolar transistors [2226-06]

    Cressler, J. D. / Joseph, A. J. / Richey, D. M. et al. | British Library Conference Proceedings | 1994