This method is mainly the target surface painted black, and the emissivity of the pyrometer is set to black paint (or black tape) emissivity {{0}}.97 (0.93), and then use infrared two-color pyrometer to measure the temperature of the black parts of the T1, and then use infrared fiber optic pyrometer to measure the surface temperature of the parts close to the black parts of the T2, adjust the infrared pyrometer emissivity value, so that the T2 is closest to T1 The emissivity value obtained at this time is the emissivity of the target to be measured.