| 摘要 |
The invention is directed to a gas cooled fiber-optic cable apparatus for use in a hostile environment, for instance adjacent a metallurgical furnace, and a method using the apparatus to determine carbon content of molten steel. The fiber-optic cable includes a radiation collection end comprising a manifold chamber that surrounds the fiber-optic cable filaments used to collect radiant energy emitted from the furnace flame. The manifold includes a tip portion having an orifice to expose the filaments to the radiant energy, and a gas supply attached to the manifold to inject a cooling gas into the chamber. The orifice provides a discharge for expelling the cooling gas from the manifold chamber at a high velocity purge to prevent foreign matter from entering the chamber. The gas cooled fiber-optic cable transmits collected radiant energy to a radiation sensor. The sensor converts the energy into voltage signals and the signal information is processed to determine carbon content of steel contained in the metallurgical furnace.
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