Research on infrared stealth methods for thermal target during sun exposure

Based on the calculation model established in this paper, the radiation temperature of a thermal target attached a thin film on its surface was calculated during sun exposure. From the results, stealth effects of the film with different parameters of the emissivity were investigated. For a thermal target, the low emissivity film has a good stealth effect in 8~14μm. However, due to the influence of solar radiation, it is difficult to achieve stealth in 3~5μm by using a low emissivity film alone. Then some other methods, such as insulation, cooling and so on, have to reduce the radiation of the thermal target for infrared stealth in this band. Moreover, these methods can also reduce the radiation of the thermal target in 8~14μm, so requirements for the emissivity of stealth film in this band can be lowered.