Anti-infrared camouflage printing principle
May 08, 2024
Keywords: printing; dye; coating; radiation protection; infrared radiation; polyester-cotton fabric.
Camouflage printed fabrics are mostly used in military camouflage uniforms and military tents. In order to facilitate Army camouflage and concealment, the camouflage color should be similar and similar to the surrounding environment, such as beach camouflage, forest camouflage, green camouflage, etc.
However, with the advancement of science and technology, high-tech reconnaissance methods are increasingly used in the military. This ordinary camouflage fabric designed according to different surrounding environments can no longer achieve good camouflage. Among them, the use of infrared reconnaissance can detect the general camouflage effect. Therefore, anti-infrared camouflage printing was developed for anti-infrared reconnaissance.
the principle of anti_infrared camouflage printing
The wavelength of visible light is 380~780 nm, of which the wavelength above 780 nm is infrared and the wavelength below 380 nm is ultraviolet.
After research, it was found that the sensitive wavelength range is 700~730 nm when observed directly through a red filter. For infrared photography and photography, the sensitive wavelength range is 800~850 nm. When observed with an infrared night vision device, its sensitive wavelength range is 900~1000 nm. Therefore, for these infrared observation instruments and equipment, the light wave range generally refers to 700~1200 nm. Data show that the reflectivity of different plants to infrared rays is different (Figure 1)
As shown in Figure 1, the reflectivity of plants to infrared rays with wavelengths between 400 and 700 nm is very small. The reflectivity of infrared rays with wavelengths between 700 and 1200 nm can rise to 30% to 60%.
Figure 2 shows that the reflectivity of soil to wavelengths 400~700 nm is also very small. Above 700 nm, the reflectivity has a significant increase and can rise to 10%~30%.
Therefore, in order to achieve counter-reconnaissance against infrared instruments, we must choose dyes with similar or identical infrared reflectivity to the surrounding environment to make camouflage uniforms. So far, a combination of selected Shilin dyes, disperse dyes and a small amount of paint has done the trick.
