Camouflage Polymer Films Of Micro–Nanoparticles In Visible And Infrared Wavelengths In Desert Background

With the development of military science and technology,infrared detection technology and infrared precision guided weapon technology have reached a quite high level,which makes the security of various military targets and weapons and equipment seriously threatened.The purpose of this paper is to design a micronanoparticle polymer film for camouflage in visible and infrared bands in desert background.In this paper,we use generalized Mie theory to solve the spectral characteristics of particle system in absorptive media,and then use Monte Carlo method to solve the optical transmission process of nanoparticles in thin films,and calculate the radiation characteristics of micro/nanoparticles-absorptive medium thin films.In this paper,the reflectance of visible band and the emissivity of infrared band of the film are compared.For the structure of micro/nanoparticles polymer films without a bottom layer,Zn S,PEI,PS,PC,Si C and TiO₂ were used as thin films respectively.Cd S and BaTiO₃ particles were embedded into the thin films to make a two-layer thin film structure.In this paper,the spectral characteristics of the film structure at the wavelength of 0.36?20 ?m were simulated,and the effects of particle size d,particle volume fraction fv,and film thickness h on the reflectance of the film structure in the visible band and the emissivity in the infrared band were investigated.Finally,the optimized structure was obtained: The emittance and reflectance curves of the structures made of Zn S and PEI films are closer to those of the desert background and further optimize the structure.A multi-particle composite structure with particle sizes of 1 ?m and 3 ?m was used.A four-layer film structure was used,and two layers of Zn S were used as the film,BaTiO₃ particles and Cd S particles were embedded respectively.And two layers of PEI were used as the film,BaTiO₃ particles and Cd S particles were embedded respectively.It was found that when the volume fraction was 10% and the thickness was 4 m,or when the volume fraction was 22.6% and the thickness was 2 m,the reflectivity and emissivity of the visible band and infrared band of the structure were very close to those of the desert background,which had better camouflage effect.For the structure of micro/nanoparticles polymer films with a bottom layer of Al,Al was the bottom layer.Zn S,PEI,PS,PC,Si C and TiO₂ were used as thin films respectively.Cd S and BaTiO₃ particles were embedded into the thin films to make a three-layer thin film structure.In this paper,the spectral characteristics of the film structure at the wavelength of 0.36?20 ?m were simulated,and the effects of particle size d,particle volume fraction fv,and film thickness h on the reflectance of the film structure in the visible band and the emissivity in the infrared band were investigated.A multi-particle composite structure with particle sizes of 1 ?m and 3 ?m was used.A five-layer film structure was used,and two layers of Zn S were used as the film,BaTiO₃ particles and Cd S particles were embedded respectively.And two layers of PS were used as the film,BaTiO₃ particles and Cd S particles were embedded respectively.It was found that when the volume fraction was 10% and the thickness was 4 ?m,or when the volume fraction was 15% and the thickness was 2 ?m,the reflectivity and emissivity of the visible band and infrared band of the structure were very close to those of the desert background,which had better camouflage effect.Due to the Al layer,the infrared emissivity of thin film with the Al layer in the same particle,under the same film thickness and volume fraction in 3 to 5 microns band and 8 to 13 ?m band is higher than those of thin film without Al layer film,and the reflectivity of visible wavelengths is lower.