Fig. 1. Blackbody with a heated halo

Fig. 2. Working principle of heated halo

Fig. 3. Noise equivalent spectral radiance of spectrometer

Fig. 4. Comparison of noise equivalent spectral radiance of spectrometer

Fig. 5. Contribution of blackbody emissivity uncertainty to radiometric calibration accuracy of spectrometer

Fig. 6. Simulation flowchart

Fig. 7. Blackbody emissivity and its uncertainty in current state. (a) Blackbody emissivity; (b) blackbody emissivity uncertainty; (c) contribution of radiometric calibration accuracy of spectrometer; (d) contribution of spectrometer sensitivity to uncertainty of blackbody emissivity; (e) contribution of blackbody temperature uncertainty to uncertainty of blackbody emissivity; (f) contribution of heated halo temperature uncertainty to uncertainty of blackbody emissivity

Fig. 8. Impact of spectrometer sensitivity to blackbody emissivity uncertainty

Fig. 9. Impact of temperature measurement uncertainty of blackbody to blackbody

Fig. 10. Impact of temperature uncertainty of heated halo to blackbody emissivity uncertainty

Fig. 11. Impact of high temperature of heated halo to blackbody emissivity uncertainty

Fig. 12. Impact of attenuation of heated halo emissivity to blackbody emissivity and its uncertainty. (a) Blackbody emissivity; (b) blackbody emissivity uncertainty

Fig. 13. Impact of geometrical radiation view factor to blackbody emissivity uncertainty

Fig. 14. Impact of temperature rise of blackbody to blackbody emissivity uncertainty

Fig. 15. Temperature rise of blackbody arisen by changes of high temperature of heated halo and its impact to blackbody emissivity uncertainty