The study on the measurement accuracy of non-steady state temperature field under different emissivity using infrared thermal image

In this paper, the temperature measurement accuracy of infrared thermal image under different emissivity is studied. Firstly, according to the formula of infrared temperature measurement, the influence of the object surface emissivity on the measurement accuracy of infrared thermal image is analyzed. The factors affecting the emissivity of the object are found. Secondly, the limitation of classical emissivity calculation method in infrared temperature measurement is explained. Thirdly, a model for improving the temperature accuracy of the non-steady state temperature field based on the emissivity of the infrared image is obtained, and the theoretical formula is obtained. Finally, three experiments of cast iron and stainless steel are carried out. The correctness and feasibility of this method is verified by the experimental results.