Fig. 1. Schematic diagram of heat radiation transfer model

Fig. 2. Reflection and spontaneous emission models of multi-coating

Fig. 3. Analysis of properties of iron and target. (a) Change of complex index of refraction with wavelength for iron; (b) change of pBRDF of the target with wavelength

Fig. 4. Polarization characteristics of reflected thermal radiation of multilayer coating target. (a) Effect of amount of coating on the reflection polarization characteristics of target; (b) variation of target reflectance with amount of coating

Fig. 5. Experimental setup and sample. (a) Long wave infrared polarization imaging system; (b) iron plate sample

Fig. 6. Images of visible light and infrared linear polarization degree of coating targets with different layers. Images of visible light of coating targets with (a) 1 layer, (b) 2 layers, and (c) 3 layers; images of infrared linear polarization degree of coated targets with (d) 1 layer, (e) 2 layers, and (f) 3 layers

Fig. 7. Comparison of linear polarization degree of target spontaneous heat radiation between simulation and experimental test

Fig. 8. Simulation and measurement results of infrared linear polarization degree in thermal radiation environment