Temperature measuring method, heat treating device and method, computer program, and radiation thermometer

Abstract

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 by using two radiation thermometers provided at a measurement part separated from the object to be measured is provided. In the method, two of the radiation thermometers have a rod that is embedded in the measurement part and can receive radiation light from the object to be measured, and an optical fiber connected to the rod; numerical apertures of the radiation thermometers are different; the multiplex-reflection environment is formed between a surface of the measurement part facing the object to be measured and the measurement part; a radiation rate ε of the object to be measured based on a result of a measurement of two of the thermometers and the temperature of the object to be measured is calculated by the following equationsα=1−(1−)ε=(1−α)·ε+α·ε/{1−·(1−ε)}wherein Drepresents a diameter of the rod of the radiation thermometers, NA represents the numerical aperture, Drepresents a distance between the object to be measured and the surface of the measurement part, r represents a reflectivity of the surface of the measurement part, F represents a view factor, α represents a multiplex reflection coefficient, εrepresents an effective radiation rate of the object to be measured, and Nand Nare parameters.