| The performance of fabrics infrared stealth has always been a hot spot in military research in various countries.Infrared stealth fabrics can not only improve the survival probability of military combatants and military equipment on the battlefield,but also improve the country's military warfare strength.With the development of infrared detection equipment and the continuous research of infrared stealth fabrics,the requirements for infrared stealth fabrics have gradually increased.Not only does the fabric have good infrared stealth properties,but it also requires good fabric properties.In this paper,based on Kirchhoffs law and Rayleigh scattering principle,studied the performance of infrared stealth fabrics taken by human body On the basis of the basic properties of the yarn,the general polyester,silver-plated filament,copper-plated filament and ZnO polyester filament were selected as the main raw materials to fabricate the fabric,the basic performance and infrared thermal imaging properties of fabrics,and the relationship between different fabric parameters and the infrared stealth performance of fabrics were studied.At the same time,the environmental adaptability of fabrics performance was analyzed and studied for indoor,outdoor,daytime,night and different test time.(1)Observing the surface morphology of silver-plated filament,copper-plated filament and ZnO polyester filament yarn,the yarn was more uniform,the coating of silver-plated filament and copper-plated filament was more obvious,the thickness of the silver plating layer was greater than the thickness of the copper plating layer.The infrared emissivity of the yarn was detected by EMS 302M infrared emissivity system.The results showed that the infrared emissivity of the silver-plated filament was 0.765,the infrared emissivity of the copper-plated filament was 0.804,and the infrared emissivity of the ZnO polyester filament was 0.789 Silver-plated filaments and ZnO polyester filaments met the standards for lower emissivity decorative fabrics.Copper-plated filaments were more standard-compliant,and silver-plated filaments had a lower infrared emissivity than copper-plated filaments.(2)A total of 26 woven fabrics were designed according to different fabrics texture,fabric tightness and weft ratio.The basic performance of the fabrics was tested according to the test criteria.The results showed that the surface of the fabric was relatively flat and the thickness was relatively uniform.The air permeability of the fabrics was between 8.6 and 554 mm/s.With the increase of the content of silver-plated filaments in the weft,the air permeability of the fabrics increased to a certain extent.The air permeability under the weft tightness of the fabric decreased with the increase of the latitudinal tightness of the fabric.According to the national standard GB/T28048-2012,it was found that most of the plain weave fabrics prepared in this paper could be used as winter clothing fabrics,and most of the twill weave and satin weave fabrics could be used as fabrics for summer garments;the strength of the fabrics basically conformed to the decorative fabrics for infrared camouflage(3)Based on the fabrics prepared in this paper,a small piece of fabric was placed on the palm of the hand for inspection,and infrared thermal imaging images of the fabrics were obtained by FLIR E5 thermal imager,and the obtained thermographic image was imported into the FLIR Tools software for processing according to the fabrics and the external environment.The radiant temperature difference was evaluated by analyzing the infrared stealth effect of the fabric.The results of infrared stealth effect analysis of fabrics under different fabric parameters were as follows:the radiant temperature difference between the fabric and the external environment was between 3-7.7?,and the fabric and fabric density remained unchanged,along with the silver-plated filaments in the fabric.When the content was increased,the infrared stealth performance of the fabric was improved,and when the content of silver-plated filaments:the content of ZnO polyester filaments in weft yarns was greater than 2:5,the fabric can achieve a better infrared stealth effect;under the condition that the weft arrangement was unchanged in the fabric structure and the fabric,as the fabric tightness increased,the infrared stealth performance of the fabric was improved,when the weft tightness of the fabric is greater than 97.6%,the fabric can achieve infrared stealth;the fabric aperture was increased,and the infrared stealth performance of the fabric was reduced,When the aperture of the fabric is less than 20 ?m,the fabric realizes infrared stealth.Silver-plated filaments and ZnO polyester filaments have a weft-to-weave ratio of 3:1 and a plain weave fabric with a warp and weft density of 1100*300/10cm,which can be used for basic research on infrared stealth fabrics for military use(4)The fabrics were tested for infrared stealth performance of fabrics after indoor and outdoor,day and night,and human body effects on fabrics after 0 s,30 s,60 s,90 s,120 s,150 s,210 s and 300 s,comparing the fabric properties.The experimental results showed that the fabrics performance of the day and night of the fabrics was as follows:indoors,the temperature difference between the fabrics prepared in this paper and the external infrared radiation was not much different,the fabric performance could maintain good stability;In the outdoor,the infrared stealth performance of the fabric had a certain difference,and the radiation temperature difference between the hand fabric and the external environment during the day was substantially smaller than the radiation temperature difference at night.The performance of fabrics with different action time showed that the temperature difference between the ordinary polyester fabric and the fabric prepared in this paper and the external environment increases with the action time.The radiation difference of the fabrics prepared in this paper was less than that of ordinary polyester fabrics.After 210 s,the radiant temperature difference of the fabric prepared in this paper began to stabilize,and the radiant temperature difference of ordinary polyester fabrics still had a certain upward trend,indicating that the environmental adaptability of the infrared stealth performance of the fabric prepared in this paper was better than that of ordinary polyester fabric;The growth rate of ordinary polyester fabric and external radiation temperature was slow to fast.The temperature difference of the fabric prepared in this paper was relatively stable first,and it increased at 210 s.It was indicated that the fabric prepared in this paper had certain stability compared with ordinary polyester fabric. |
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