黑体涂层光谱发射率特性研究  

Research on spectral emissivity characteristics of blackbody coatings

作　　者：丁经纬 郝小鹏[2] 于坤[1] 宋健[2] 周晶晶 Ding Jingwei;Hao Xiaopeng;Yu Kun;Song Jian;Zhou Jingjing(College of Physics,Henan Normal University,Xinxiang 453007,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]河南师范大学物理学院,河南新乡453007 [2]中国计量科学研究院,北京100029

出　　处：《红外与激光工程》2023年第10期226-235,共10页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2022YFF0610800,2022YFF0610801);国家自然科学基金项目(12075229,62031018)。

摘　　要：为了得到高发射率黑体涂层的辐射特性,通过人工喷涂制备了三种不同材料的高发射率黑体涂层。基于中国计量科学研究院的发射率测量装置,对比了GR、Nextel 811-21和Nextel 811-21+MWCNT三种涂层在大气下和真空中的室温光谱发射率,研究了GR和Nextel 811-21涂层的厚度对光谱发射率影响,测量了三种涂层在不同角度下的光谱发射率,通过空间辐照三种涂层样品,对比了辐照前后样品光谱发射率的变化。实验结果显示,三种涂层在大气和真空下光谱发射率能够较好重合;Nextel 811-21和GR涂层较薄时,发射率较高,可达到0.978;当测量角度在30°范围内,Nextel 811-21和GR涂层发射率基本不变,Nextel 811-21+MWCNT涂层发射率会降低;涂层受空间辐照影响,GR涂层发射率会降低0.0004~0.0009,Nextel 811-21+MWCNT涂层发射率会降低0.0011~0.0021,Nextel 811-21涂层发射率会增大0.0008~0.0017。Objective Blackbody radiation source is a standard instrument used to calibrate radiation thermometer and infrared thermal imager,etc.Weather satellites are equipped with blackbody radiation source for real-time calibration in orbit.As one of the most important indicators of black body,infrared spectral emissivity is defined as the ratio of the radiation capacity of an object to that of an ideal blackbody at the same temperature and wavelength.The actual emissivity of the blackbody is closely related to the surface microstructure of the blackbody and the emissivity of the coating material,that is,the emissivity of the blackbody is affected by the radiation characteristics of the surface coating under a specific structure.Therefore,it is necessary to explore the infrared radiation characteristics of blackbody coating,which is of great significance to achieve high-precision infrared remote sensing calibration.Methods Based on the emissivity measuring device of controlling environmental radiation emission ratio method established by National Institute of Metrology,China(Fig.1),three kinds of high-emissivity blackbody coatings of different materials were prepared by manual spraying(Fig.3),and factors affecting the spectral emissivity of the coatings were explored,including the measuring environment,thickness and angle.The spectral emissivity of the blackbody coating before and after irradiation was compared by simulating the space radiation environment with ground equipment.Results and Discussions There are a lot of gases such as carbon dioxide and water vapor in the air,and the spectral emissivity of the three coatings all show a large jitter at 5-7μm in the atmosphere,while the emissivity results are relatively smooth under vacuum(Fig.4).When the blackbody coating thickness is relatively thick,the emissivity decreases by 0.01 at most(Tab.1).The reason is that when the coating thickness is relatively thick,the pores will decrease,which is not conducive to the multiple reflection and absorption of electromagnetic wa

关 键 词：高发射率涂层 黑体 空间辐照 发射率 

分 类 号：TB96[机械工程—光学工程]