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Argon in ultraviolet medium pressure mercury lamps

Discussion in 'General Electronics' started by [email protected], Nov 6, 2004.

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  1. Guest


    I am researching medium pressure mercury lamps for uv curing process.

    I have information about voltage, current, arc lenght, bulb
    dimensions, power, and amount of mercury, as well.

    I know that these lamps are filled with a very small amount of argon
    (or other rare gas) in order to start the arc at room temperature and
    lower voltages.

    But I do not know how to calculate this "small" amount of argon. I
    know this amount is less than 20 milimeters of Hg (20 Torr) and about
    4-10% of the total pressure of mercury filled in the bulb.

    If someone can help me in order to determinate this amount of argon I
    would apreciate. If someone need my help in subjects relationed to
    ultraviolet technology please send me a message.

    Best Regards,

    Mr.Marcio Moraes
    email : or

    Posted at:
  2. Robert Baer

    Robert Baer Guest

    Perhaps one could look at the intensity of the various spectral lines.
    The part that helps, is that the spectral lines are unique to each
    element (gas).
    Perhaps, at a given (fixed) excitation (current thru the ions), the
    intensity ratios of an Argon line to a Mercury line is related to the
    concentration ratio?
    I ad mit i am guessing, but it is a possible avenue - and if not, may
    give you other ideas...
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