By use of the Kubelka-Munk theory, the Mie theory and the independent scattering approximation, we obtain the explicit expression of the emittance of an infrared coating attached to a radar absorber with a high emittance, in the 3 approximately 5 mu m window. Taking aluminum particles with spherical shape as the pigments within the coating, we give the dependence of the coating emittance with respect to the particle radius, the thickness of the coating. At a volume fraction of 0.05, we propose the optimum particle radius range of the pigment particles is around 0.35 approximately 0.6 mu m. When the thickness of the coating exceeds 300 mu m, the decrease of emittance at 4 mu m wavelength becomes negligible. Too much thickness of IR layer wouldn't contribute to the decrease of emittance. We study the influence of the infrared coating on the performance of the radar absorber, and believe that not too much thick infrared coating consisting of spherical Al particles would not result in a remarkable deterioration of the absorbing ability of the radar absorber.
Emittance of a radar absorber coated with an infrared layer in the 3 approximately 5 mu m window
Optics Express ; 13 , 25 ; 10382-10391
2005
10 Seiten
Aufsatz (Zeitschrift)
Englisch
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