PURPOSE: To rapidly analyze even a molten metal whose surface varies violently, with high accuracy, by providing a laser oscillator, a sample collecting device and a spectroscope.
CONSTITUTION: For example, when a molten metal 2 to be measured is the molten steel 2 in a converter during blowing, a part of the molten steel in the converter is collected using a sample collecting device 5 to be arranged to the focal position of a condensing lens 4. When impurities are present on the surface of the molten steel 2 at this time, said impurities are removed by blowing gas to the surface of the molten steel 2 to clean said surface. Next, laser beam is emitted from a laser oscillator 1 and passes through a laser protective cylinder 12 filled with inert gas to be changed in its direction by a prism 3 and is condensed to the surface of the molten steel 2 in the sampling device 5 through the lens 4 to irradiate the same. The beam emitted in a horizontal direction of the plasma formed by the irradiation with laser beam passes through a beam introducing system protective cylinder 14 to be introduced into a spectroscope 6 through a concave mirror 7 and a flat mirror 8 and is separated into the spectra of respective elements and the contents of respective components are calculated by a computer 11 through a beam detector 9 and a signal processor 10.
Yamamoto, Akira
Matsumura, Taiji
Sumiyama, Kozo
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