[Optimum parameters of four-color high temperature measurement]

The ratio of the intensity of black body radiation at four wavelengths was calculated by the blackbody radiation law. The result shows that there is a good single-valued relationship between the ratio and the temperature of an emission body under some given conditions, and the impact of radiant emittance on the measurement of temperature was reduced to some extent. The optimum conditions, such as measured wavelengths, wavelength distance and integrating width at every measured point were deduced. The results were diagrammed and discussed.