涂料发射率与相变层在伪装中的要求分析

Research on Camouflage Requirement of PCM Layer and Coating Emissivity

为了对相变层的厚度以及伪装涂料8～14μm波段发射率值在不同季节对目标的伪装效率影响,结合太阳辐射,植被温度以及气温变化,建立目标及单一植被背景在晴朗天气情况下不同季节的一日辐射温度变化模型。先后改变相变层的厚度和涂料发射率值,得出相应的目标辐射温度。计算采用不同相变层厚度和发射率值时目标的伪装效率,结合伪装效率及实际使用的考虑,认为相变层厚度为1.5 mm时最佳,且在春夏秋配合选用发射率值为0.5、0.3和0.4时可得最高白天伪装效率,选用发射率为0.9、0.8和0.9时可得最高的晚上伪装效率和全天伪装效率。

To analyze the seasonal camouflage requirements of the coating average emissivity at8~14μm waveband and the thickness of phase change material(PCM)layer,with the investigation on solar radiation,the vegetative cover′s temperature and the air temperature in one day,a temperature model of target that display the changing of its radiation temperature in one day of different seasons is built.The thickness of the PCM layer and the coating emissivity are changed to obtain the the target radiation temperature.The camouflage efficiency is calculated with different PCM layer thickness and coating emissivity,taking the camouflage efficiency and actual application into account,when PCM layer’s thickness reaches1.5mm,the result is suitable.In this condition,in order to obtain the best camouflage efficiency in the daytime,the coating emissivity should reach0.5,0.3,and0.4respectively in spring,summer and autumn.To obtain the best camouflage efficiency of the night and whole day,the coating emissivity should reach0.9,0.8and0.9respectively.