Measuring Accuracy of Temperature Dependence on Thermal Emissivity in Flame

Some factors were analyzed that thermal emissivity of gray-body were brought change in this paper, such as wavelength and temperature and absorbing spectrum and emissive spectrum and the surface characteristic in flame. Based on the thermal radiation theory of gray-body, the emissivity function theoretic model of the burning object was presented. Different approximation schemes were adopted according to the property of combustion production, the equation was set up in combustion field. The influence of the measuring temperature accuracy to the emissivity precision was developed in flame. The results shows the object in flame can be divided into three kinds of gray body, the measurement by multi-wavelength can improve efficient the measuring precision.