Fig. 1. Emissivity spectra of typical materials in MODIS UCSB emissivity library. (a) Water; (b) soil; (c) vegetation; (d) man-made materials

Fig. 2. Samples of self-tested materials

Fig. 3. Infrared spectral radiation emissivity of self-tested materials

Fig. 4. Ratio of MWIR emissivity to LWIR emissivity k_ε of five kinds of materials

Fig. 5. Schematic diagram of medium wave and long wave colorimetric imaging method for temperature measurement based on wide-band uncooled IRFPA

Fig. 6. Four-band coaxial imaging system

Fig. 7. Polynomial fitting of ratio Q₁ to temperature T

Fig. 8. Polynomial fitting of LWIR gray value and temperature T

Fig. 9. Experimental platform of double-band colorimetric temperature measurement

Fig. 10. MWIR and LWIR radiation thermometry images

Fig. 11. Improvement effects of bias drift correction on thermometry results. (a) Temperature before correction; (b) temperature after correction

Fig. 12. Results of wideband colorimetric imaging thermometry in real-world scenarios. (a) MWIR images; (b) LWIR images; (c) results of colorimetric imaging thermometry