Nippon Steel Corporation

Toshihiko Shibata

Tohru Iuchi

Yozo Takemura

Kunitoshi Watanabe

Eisuke Akiyoshi

Hiroshi Matsukubo

Tetsuro Kawamura

When a steel sheet or the like is heated in a furnace to a temperature somewhat higher than the room temperature and is still or moved, its temperature can be measured by detecting the radiant energy therefrom. The measurement is normally difficult due to the influence of background noise of radiant energy from the surroundings, change of the transmittance factor of the environment or atmosphere for radiant energy, and change of the emissivity of the object to be measured. In order to remove such causes of errors and to correctly measure the temperature by detecting radiant energy, a radiometer and a black body radiator are disposed symmetrically and specularly with respect to the normal to a surface of an object to be measured, and two different amounts of radiant energies are emitted from the black body radiator, and the emissivity of the object to be measured is determined from the detected values from the radiometer, the two temperature values of the black body radiator, and the diffusely reflecting factor associated with the object to be measured, whereby correct measurement of the surface temperature of the object to be measured can be done. Embodiments for implementing this method are proposed.

Method of and an apparatus for measuring surface temperature and

An improved measuring lance to be inserted into a bath of molten metal, for example, molten steel, is disclosed having thermocouples on its tip end and in its receptacle chamber, respectively. The lance is provided with means to discharge air from inside a cover for a thermocouple in a receptacle chamber. A deoxidation chamber made of steel may be provided in the lance. Means to spray gas from around the connector of the lance may also be provided. These means assure accurate measuring of the temperature, composition, etc. of the bath.

Measuring lance for molten metal such as steel

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Tohkai, Japan

Toshihiko Shibata