星载铝漫反射板光谱特性测量研究

星载成像光谱仪在轨通过漫反射板获取太阳参考谱时，漫反射板自身光谱结构会引入到太阳参考谱中，影响气体的反演精度。基于此，分析了漫反射板光谱结构产生原理，并在实验室完成了铝漫反射板光谱特性的测量，得到了铝漫反射板在观测角度[15°, 40°]内的光谱结构。由结果可知，在波段450～600 nm，SFA基本保持不变，大小为0.2%～0.6%；在波段600～750 nm，SFA逐渐增大，SFA为0.3%～1.6%。对光谱结构的降低进行了讨论，通过对漫反射板的光谱进行平滑校正，可将光谱结构降低约76%。

Study on the Spectral Features of Space-Borne Aluminum Diffuser

Imaging spectrometer uses a space-borne diffuser to obtain solar reference spectrum. The spectral features of space-borne diffuser will be introduced to the solar reference spectrum. The spectral features that interferes the gas absorption structure influence the inversion precision of gases. The causes of spectral structure of aluminum diffuser is analyzed, and the spectral structures in the observation angle [15°, 40°] are measured in laboratory. The results show that the spectral structuse increases with wavelength: 450～600 nm，the spectral structure is 0.2%～0.6%；600～750 nm，the spectral structure is 0.3%～1.6%. Spectral structure reduction method is discussed. The spectral structure can be reduced about 76% by smoothing the spectrum of aluminum diffuser.