Fig. 1. The schematic and image of the device

Fig. 2. The schematic of the blackbody and sample stage

Fig. 3. The schematic of the emissivity measurement device based on controlling surroundings radiation

Fig. 4. The samples of JSC-3 and GR

Fig. 5. Spectral emissivity of JSC-3 sample range from room temperature to 1000 ℃

Fig. 6. Directional spectral emissivity of JSC-3 sample at 300 ℃

Fig. 7. Difference of spectral emissivity between normal and different angles of JSC-3 at 300 ℃

Fig. 8. Spectral emissivity of GR in range of room temperature to 150 ℃

Fig. 9. Directional spectral emissivity of GR sample

Fig. 10. The comparison of the normal spectral emissivity of JSC-3 and GR measured by two methods at room temperature