光谱辐射率是表征材料表面辐射特征的重要物理量。本文采用能量法，基于傅立叶红外光谱仪（FTIR）进行光谱辐射率测量试验研究，分析了光谱仪校准方法，测量了不同温度下铜的法向光谱辐射率。结果表明：线性拟合法很好地获得了光谱仪响应函数与背景辐射；双温黑体法能够快捷地校准光谱仪，所选两个黑体的温度在大温差条件下可以获得足够校准精度；铜的光谱辐射率随温度升高而整体上升，随波长增加逐步降低。
Spectral emissivity is an important parameter that dictates the extent of heat radiated from material surface. According to the definition of spectral emissivity, the experimental research on the spectral emissivity measurement was carried out based on the Fourier transform infrared（FTIR） spectrometer. The methods of spectrometer calibration were analyzed. The normal spectral emissi- vity of Cu was measured at different temperature. The results show that the linear fitting method can obtain the response function and background radiation of the FTIR spectrometer. The two- temperature method can calibrate the FTIR spectrometer quickly, the calibration accuracy is higher for the bigger temperature interval. The normal emissivity of Cu increases with increasing temperature, and decreases with increasing wavelength.
参考文献
| [1] | Balat-Pichelin M;Robert JR;Sans JL .Emissivity measurements on carbon-carbon composites at high temperature under high vacuum[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2006(2):778-783. |
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