Metrological features of color pyrometry

Abstract

An examination of the sources of errors leads to the conclusion that in many instances the methods of color pyrometry can improve the precision of industrial temperature measurements. This is the case in the measuring of the temperature of oxidized and other surfaces with a rough structure, of clean surfaces of many metals in different conditions, of components in closed furnaces (through windows, etc.). and in many other cases. Objective color pyrometers are particularly useful, for they have a high instrument accuracy and measure directly the redblue ratio. However, in making the color measurements it should be remembered that the selective, especially the changing, emission or absorption produces an error which often exceeds the error of the brightness method.