Patent ID: 6860634
Filing Date: 2005-03-01
Classification: G01J

Abstract:
1. A method of temperature measurement for measuring a temperature of an object to be measured that is heated by a heating source in a multiplex-reflection environment, comprising: providing at least two radiation thermometers at a measurement part separated from the object to be measured; measuring a radiation rate of the object to be measured using said radiation thermometers; and calculating a temperature based on the radiation rate, wherein each of the radiation thermometers includes a rod that is embedded in the measurement part and can receive radiation from the object to be measured, each rod having the same diameter, and an optical fiber connected to each rod, the numerical apertures of the radiation thermometers being different; wherein the multiplex-reflection environment is formed between a surface of the measurement part facing the object to be measured and the object to be measured; and wherein calculating a temperature based on the radiation rate comprises determining a radiation rate ε of the object to be measured and the temperature of the object to be measured by a calculation that includes the following equations wherein D