黑体涂层宽温区红外光谱发射率特性研究(内封面文章)

Research on infrared spectral emissivity characteristics of blackbody coatings with wide temperature range(inner cover paper)

为了研究高发射率黑体涂层的宽温区红外辐射特性,基于两种发射率测量装置测量了应用于不同温度场景的JSC-3和GR两种涂层宽温区3~14μm内的光谱发射率。其中JSC-3和GR涂层的测量温度范围分别是室温~1000℃和室温~150℃。分析了两种涂层光谱发射率与温度之间的关系以及不同角度下方向光谱发射率的变化。实验结果表明:宽温区内JSC-3和GR涂层在8~14μm的光谱发射率分别优于0.96和0.97,且光谱发射率保持稳定,变化量分别小于0.01和0.003。两种涂层在0°~30°内的方向光谱发射率均具有较好的一致性,变化量均小于0.005。最后利用积分球反射法得到了两种涂层在室温下3~14μm内的连续光谱发射率数据,实现了两种涂层在宽温区宽波段内的光谱发射率数据覆盖。

Objective To obtain the infrared radiation characteristics of the high-emissivity blackbody coating in wide temperature range, the spectral emissivity of two blackbody coatings which are applicable in various temperature scenarios were measured based on two devices. The temperature measurement range of JSC-3 coating spans from room temperature to 1000 ℃, while the temperature measurement range of GR coating extends from room temperature to 150 ℃. The relationship between the spectral emissivity and the temperature of the JSC-3 and GR coating was shown respectively, and the investigation delved into variations in directional spectral emissivity across different angles. Experimental findings indicated that the spectral emissivity of JSC-3 and GR coatings at 8-14 μm exceeds 0.96 and 0.97, respectively. The spectral emissivity of the two coatings remains stable in the wide temperature region, and the variation is separately less than 0.01 and 0.003. Both coatings demonstrate excellent directional spectral emissivity consistency within 0°-30°, exhibiting minimal variations of less than 0.005. Finally, the spectral emissivity of JSC-3 and GR coatings in the range of 3 μm to 14 μm at room temperature was measured by integrating sphere reflectance method, which successfully obtained comprehensive spectral emissivity data coverage across a wide temperature range and broad wavelength band for two coatings.Methods Based on the different emissivity measuring devices, the spectral emissivity characteristics of two blackbody coatings in wide temperature region were studied(Fig.1-2). The variation of the spectral emissivity of the coating with temperature and angle was discussed, and the difference of the spectral emissivity at various temperature and angles of two blackbody coatings was shown concretely.Results and Discussions The spectral emissivity of JSC-3 and GR coating is respectively better than 0.96 and 0.97(Fig.5, Fig.8), The variation of the spectral emissivity of two coatings is separately less than 0.01 and 0.005.There is a slight decrease within 0.005 in directional spectral emissivity for both JSC-3 and GR coatings as angle increases within 30°(Fig.6, Fig.9), and the maximum reduction of JSC-3 is 0.05 in the range of 0°-60°(Fig.6).The spectral emissivity of the GR coating exhibits a higher sensitivity to angle variations at elevated temperatures(Fig.9). The continuous spectral emissivity data of the two coatings in the range of 3 μm to 14 μm were obtained using the integrating sphere reflection method at room temperature, enabling broad coverage of their spectral emissivity data across a wide temperature range.Conclusions Two blackbody coatings have excellent spectral emissivity performance at the operating temperature, and the average spectral emissivity of JSC-3 and GR coatings at 8-14 μm is better than 0.96 and 0.97, respectively(Fig.5, Fig.8). The difference of average spectral emissivity of JSC-3 from room temperature to 1000 ℃ is less than 0.01, while the difference of GR from room temperature to 150 ℃ is less than 0.003. The temperature stability exhibited by all of them was commendable. When the angles are ranging from 0° to 30°,there is a slight decrease within 0.005 in directional spectral emissivity for both JSC-3 and GR coatings as angle increases, the spectral emissivity in the direction of 30° remains consistent. The continuous spectral emissivity data of the two coatings were acquired at room temperature in range of 3-14 μm measured by integrating sphere reflectance method, and the spectral emissivity data coverage of the two coatings is achieved across a wide temperature range and a broad spectrum. The experimental results provide robust evidence supporting the simulation and design of blackbodies across various temperature ranges and spectral bands.