Patent ID: 6846105

Claim:
A method for measuring the temperature of molten steel continuously, comprises the following steps: providing a temperature measuring tube that is made of an inner bushing as a blackbody cavity radiator and an outer bushing, both of the inner and outer bushings being closed at one end an open at another end; putting the closed end of the temperature measuring tube into the molten steel in such a way that the ratio of the length of the temperature measuring tube under the surface of the molten steel to the inner diameter of the inner bushing is equal to or greater than 15 and the ratio of said length to the outer diameter of the outer bushing is greater than 3 so as to form stable blackbody radiation; connecting the open end of the temperature measuring tube with an infrared detector system connected to a signal processor; and calculating the temperature of the molten steel through evaluating the blackbody radiation emitted by the inner bushing at the end that was put into the molten steel by means of the signal processor.