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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 physical quantity that characterizes the radiation characteristics of a material’s surface. In this paper, the energy emissivity method was used to conduct the spectral emissivity measurement experiments based on Fourier transform infrared spectroscopy (FTIR). The spectrometer calibration method was analyzed and the normalized spectral emissivity of copper at different temperatures was measured. The results show that the linear fitting method can well obtain the response function of the spectrometer and the background radiation. The dual temperature blackbody method can quickly calibrate the spectrometer. The temperature of two selected black body can obtain sufficient calibration accuracy under large temperature difference. The rate rises as a whole with increasing temperature and decreases with increasing wavelength.