To provide an apparatus for measuring a temperature of a molten slag which can surely measure a temperature of a level of the molten slag even in a furnace of a high concentration of soot and dust.
In this method for measuring the temperature of the molten slag, a plurality of radiation lights 8 of a wavelength band of 2-20 μm radiated from the level 5a of the molten slag 5 stored in the furnace are collected. A pyroelectric element 28 is intermittently exposed to the radiation light 8, whereby an output voltage of an amplitude corresponding to an intensity of the entering radiation light 8 is generated from the pyroelectric element 28. The temperature of the level of the molten slag 5 is estimated from the output voltage value and the Planck's formula of radiation.
NOMA AKIRA
NISHIKAWA SUSUMU
IKE MINORU
INOUE KEITA
