论文部分内容阅读
采用紫外-可见光-红外分光光度计、傅里叶红外光谱仪,在室温条件下,测量Mo-SiO2太阳选择性吸收涂层在空气300℃退火前后0.34～25.00μm波长范围内的近法向反射光谱曲线。假设室温和高温条件下光谱反射特性不变,根据基尔霍夫定律计算出涂层在不同温度下的法向发射比。采用辐射计法,测量同一片样品在200℃、300℃时的法向发射比,两种方法得出的数值差异仅为0.02～0.03。经误差分析发现,在保证涂层退火前后反射光谱曲线不变、工作温度不超过300℃的情况下,基于室温反射光谱曲线和中温辐射计法的结果在测试仪器的误差范围内基本等效。
Near-law reflectance spectra of Mo-SiO2 solar selective absorbing coatings in the wavelength range of 0.34 ~ 25.00μm before and after annealing at 300 ℃ in air were measured by UV-Vis-IR spectrophotometer and Fourier transform infrared spectrometer curve. Assuming that the spectral reflection properties are unchanged at room temperature and high temperature, the normal emission ratio of the coating at different temperatures is calculated according to Kirchhoff’s law. Radiometer method was used to measure the normal emission ratio of the same sample at 200 ℃ and 300 ℃. The difference between the two methods was only 0.02 ~ 0.03. The error analysis shows that the results based on the room temperature reflection spectrum curve and the mid-temperature radiometer method are basically equivalent within the error range of the test instrument when the reflection spectrum curve before and after the coating annealing is kept unchanged and the working temperature does not exceed 300 ° C.