Fig. 1. Schematic diagram of infrared temperature measurement based on radiation shielding

Fig. 2. Schematic diagram of infrared temperature measurement based on external radiation sources

Fig. 3. Infrared temperature measurement results of optical mirrors outdoors

Fig. 4. Temperature dependent reflectance curves of six metals at different wavelengths：（a）λ= 0.69 μm；（b）λ= 1.06 μm；（c）λ=10.6 μm

Fig. 5. The temperature dependent reflectance curves of copper at different wavelengths

Fig. 6. Schematic diagram of the temperature measurement principle of Land surface pyrometer

Fig. 7. Temperature measurement principle diagram of ReFaST：（a）direct measurement of the metal radiance；（b）measurement of the metal radiance after amplification by a reflector

Fig. 8. Schematic diagram of infrared temperature measurement principle based on cylindrical reflector：（a）direct measurement of the metal radiance；（b）measurement of the metal radiance after amplification by a reflector；（c）measurement of specular reflection parameter

Fig. 9. Schematic diagrams of the proposed IMT designs：（a）parabolic IMT；（b）conical IMT

Fig. 10. Temperature control principle of IMT and experimental diagram of optical mirror temperature measurement：（a）schematic diagram of the IMT’s temperature control system；（b）a photo of the IMT measuring an optical mirror