Method for measuring optical characteristics of opaque and translucent solids at temperatures to 1600°C

A setup is developed for measuring optical characteristics of opaque and translucent solids in the temperature range of 25 to 1600°C and spectral range of 0.65 to 10.6 µm. Procedures of calibration experiments and measurements of spectral and integral emissivity are described. These procedures allow spectral and integral emissivity and spectral and integral reflectances of various materials, including translucent ones, to be measured accurate to about 10% in the spectral range of 0.65 to 10,6 µm and temperature range of 25 to 1600°C. Optical characteristics of materials are measured at the atmospheric pressure in the normal oxygen atmosphere or in the atmosphere with reduced oxygen content (inert gas or carbon dioxide blowing on the frontal surface of the samples). The accuracy of the thus obtained data on temperature and spectrum dependences of optical characteristics of materials allow measurements to be performed for developing various structures capable of operating at high temperatures.