Sensing elements are located at various required levels in a vacuum dewar. Resistance changes are detected external to the container and used to indicate the presence of a liquid at a particular level. This invention is utilized at present as part of an infrared aircraft detection system. This system has 28 IR detectors arranged in a vertical line and located in a glass dewar. These detectors have to be cooled to 77 K by liquid nitrogen LN2 for proper operation. The detector-dewar assembly is located in the focal plane of a Schmidt optical system. This optical unit is rotated at a 1 revolution/second rate and becomes the scanning head of the infrared aircraft detection system.


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    Title :

    Liquid Nitrogen Level Indicator


    Contributors:

    Publication date :

    1978


    Size :

    5 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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