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Application of Pyrometry and IR-Thermography to High Surface Temperature Measurements

Abstract : In this document the non-intrusive temperature measurement techniques like pyrometry and IR- thermography and their application at high temperatures are described. For a better understanding first some basic relations of thermal radiation are discussed followed by the absorption behaviour of the atmosphere and optical glasses. Main properties of different IR detector types follows this chapter. Chapters five and six are devoted to the description of pyrometers and IR-cameras including a comparison of different detectors, data reduction and imaging techniques. Based on the experience from application of IR devices at the arc heated facility LBK, some requirements on an IR-system for its use at high enthalpy facilities are defined. Results of comparative and complementary measurements of the surface temperature of several thermal protection materials using pyrometers and IR-cameras are presented in chapter nine.