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Method and apparatus for optically coupling an element analysis system and a laser to liquid metal in a melting vessel

  • US 4,995,723 A
  • Filed: 09/29/1989
  • Issued: 02/26/1991
  • Est. Priority Date: 10/03/1988
  • Status: Expired due to Fees
First Claim
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1. A method of analyzing elements of a metal melt contained in a melting vessel, comprising the following steps:

  • (a) introducing an inert gas at a temperature in excess of 300°

    C. laterally into a tube passing through a lateral wall of the melting vessel and opening thereinto;

    (b) generating a laser beam;

    (c) passing the laser beam through an adjustable first lens system;

    (d) reflecting the laser beam by a mirror into said tube through a quartz window closing said tube;

    (e) generating a plasma in said tube by focusing the laser beam by said adjustable first lens system onto the surface of the metal melt in said tube by the condition that the relation of the intensities MeI /MeII is a minimum;

    (f) guiding the light generated by the plasma through said quartz window to an adjustable second lens system;

    (g) coupling the light by said second lens system with an optical waveguide so that the plasma is focused on the input end of the waveguide; and

    (h) introducing the light by the optical waveguide into a spectrometer.

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