Test And Simulation On Infrared Stealth Characteristic Of Micro-Nano Structure In Bionic Butterfly Scales

Stealth technology has important meaning to reduce the probability of being found and detected and enhance survival ability for military targets.The existing stealth technology is unable to meet the needs of all-round stealth in band compatibility and in efficiency.A new artificial material and structure is becoming a hot spot of research.Photonic crystal is the result of biological natural micro-nano structure of artificial nature materials,in which the band gap of their special structure can inhibit the radiation shielding object.This paper intends to utilize morpho scales on the surface of three-dimensional micro-nano structure formed by natural photonic crystal light reflection,interference,diffraction radiation caused by the obvious inhibition,carrying out the compatibility of stealth technology fundamental research.The mutual relations between structure and optical properties on the butterfly wings scales were researched in terms of bionics.On this basis,constraints model which analysis the relation between structure characteristics and bionic micro-nano structure was established to provide the technical route and theoretical guidance for manufacturing stealth structure materials.Firstly,by optical microscope(OM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM),the scaly surface morphology and cross section of Green belt cui swallowtail butterflies,Euploca Algea,Morpho Didius and Morpho Rhetenor are observed,tested and analyzed to find the carinate cyclical orderly structure on the surface of wings scales and the tree ridge structure which is composed of chitin thin layer on cross section.Secondly,spectrometer systems of the reflection probe is constructed to measure the reflection efficiency in infrared range of light,obtaining four samples of butterfly wings reflection spectrum.Butterfly wings is analyzed on the scales in the infrared reflection characteristics,within the scope of the nanoscale tree layer structure and basic parameters of the ridge can be obtained.Thirdly,based on tree layer nanoscale ridge structure and each structure test parameters on butterfly wings scales,we have established two kinds of simplified model of three kinds of cobalt,which are flat layer model,tilted fault model and oblique cone layer model.According to the theory of multilayer thin film interference and diffraction grating and the simulation software based on the theory of the rigorous coupled,we can acquire the tilted fault model which is the optimization model.Finally,on the basis of the optimization model,the single structural parameter is changed to simulate the relationship between the wavelength and the reflection characteristics.After analysing the effect of multiple parameters on the reflectivity,we build the bionic optimization model with radiation inhibition.Contrast reflection spectroscopy of stealth bionic optimization structure and natural butterfly wings scale test,the result indicates that the reflectance spectral of bionic optimization model is in conformity with the test spectrum curve,which show that invisible optimizing structure is reasonable.