| 摘要 |
PURPOSE:To enable continuous measurement of components of a molten metal, by leading out excitation light from the molten metal so arranged to emit light as excited by laser light with a optical fiber to measure component of the molten metal by emission spectral analysis method based on the excitation light. CONSTITUTION:In refinement of a molten steel 12, a gas of oxygen or the like is jetted against the molten steel 12 from a gas jet port 6a of a blowing lance 6 to refine the molten steel 12 while blowing off a slag 13 located in the direction of jetting gas. When laser light oscillated from a laser oscillator 10 is made to irradiate the surface of the molten steel 12 cleared of the slag 13 through an optical fiber 8, the molten steel 12 is evaporated by the laser light and moreover the excitation light emitted by excitation is received at the tip of the optical fiber 8 to be introduced to a spectral analyzer 9. This excitation light contains a spectrum with the intensity corresponding to the concentration of components in the molten steel 12 and the spectrum is converted into an electrical signal with the analyzer 9 to be outputted to a calculator 11. The calculator 11 which is programmed as specified beforehand corrects the electrical signal and determine the contents of the components of the molten steel.
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