Fig. 1. Schematic diagram of heat radiation transport equation

Fig. 2. Simulation structure diagram of zinc sulphide infrared window

Fig. 3. Inner surface temperature rise curves of zinc sulphide infrared window under different heating temperatures

Fig. 4. Stress variation curves and temperature distribution maps of edge and center positions of zinc sulphide infrared window under different heating temperatures. (a) 378 K; (b) 440 K; (c) 519 K; (d) 550 K

Fig. 5. Variation of temperature with radiance for zinc sulphide infrared window material

Fig. 6. Schematic diagram of spectral radiometry measurement of zinc sulfide infrared window material under temperature varying conditions

Fig. 7. Comparison of spectral radiant energy in medium wave of zinc sulphide infrared window material at different temperatures

Fig. 8. Enlarged original spectral curves of zinc sulphide infrared window material

Fig. 9. Comparison of spectral radiant energy in medium wave of blackbody at different temperatures

Fig. 10. Spectral radiation curves of zinc sulphide infrared windows with temperature variation at different wavelengths

Fig. 11. Emissivity and imaging maps of zinc sulphide infrared window material at different temperatures. (a) 358.55 K; (b) 377.55 K; (c) 409.95 K; (d) 439.65 K; (e) 457.85 K; (f) 492.85 K; (g) 519.15 K; (h) 549.95 K

Fig. 12. Temperature map of zinc sulphide infrared window 519 K long wave infrared

Fig. 13. Indicator maps of 358.55 K target and top, bottom, left and right four backgrounds

Fig. 14. Grey scale mean and error bars of target and top, bottom, left, and right four backgrounds

Fig. 15. Contrast between target and four backgrounds top, bottom, left and right