ANALYSIS OF THE METHODOLOGY FOR USING THE INTEGRAL RADIATION COEFFICIENT IN ENERGY PYROMETERS

Abstract

The principle of operation of energy pyrometers for measuring the temperature of heated products is based on measuring the radiation flux from a heated product, which depends not only on the temperature of the object, but also on the emissivity of the surface of the material. The main error of such pyrometers is the methodological component, which is due to the variability of the radiation coefficient of the surface of the product material. In practice, the radiation coefficient of the surface of the material of the product is determined approximately using reference books. It should be noted that the radiation coefficient theoretically depends on the wavelength and temperature, and reference books give dependences on only one parameter, and in different reference books for the same material, the dependences differ. In addition, when using spectral dependences, it is necessary to take into account the spectral characteristics of all elements of the optoelectronic path. So, the use of this method limits the accuracy of temperature measurement. For a more accurate determination of the radiation coefficient, a preliminary study is required, which requires more sophisticated equipment than a pyrometer. In the article, an analysis was made of the errors in determining the temperature using the average value of the radiation coefficient. To improve the accuracy of measuring the temperature of an object, a device was developed that implements the method of exemplary signals and uses the average value of the radiation coefficient. The developed device preliminarily determines the dependence of the average value of the emissivity on temperature, and when working, it determines the temperature of the part based on the results of measurements with a pyrometer and the dependence.