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Emittance of a radar absorber coated with an infrared layer in the 3~5µm window

2005; Optica Publishing Group; Volume: 13; Issue: 25 Linguagem: Inglês

10.1364/opex.13.010382

1094-4087

Lingyun Liu, Rongzhou Gong, Yongshan Cheng, Fengguo Zhang, Huahui He, Dexiu Huang,

Radar Systems and Signal Processing

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 3~5microm 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 0.35~0.6microm. When the thickness of the coating exceeds 300microm, the decrease of emittance at 4microm 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 wouldn't result in a remarkable deterioration of the absorbing ability of the radar absorber.