Fig. 1. Design of gallium fixed point space infrared radiation standard blackbody

Fig. 2. Gallium fixed point space infrared radiation standard blackbody physical display

Fig. 3. Cavity geometry and emissivity simulation results

Fig. 4. The temperature field and phase change simulation of blackbody, including the temperature distribution of the (a) whole body, (b) cross-section and (c) radiation surface during the initial phase of phase change, the temperature distribution of the (d) whole body, (e) cross-section and (f) radiation surface during the final phase of phase change

Fig. 5. Radiant temperature test results during phase transition

Fig. 6. Emissivity test results based on the control environment radiation reflectance method

Fig. 7. (a) Phase change experiment site schematic; (b) Phase change reproduction curve; (c) Comparison of TRT radiometric temperature measurement with PRT contact temperature measurement