光栅式成像光谱仪空间均匀性测试研究

Research on spatial uniformity test of grating imaging spectrometer

空间均匀性是成像光谱仪辐射定标的核心参数之一。通过对国内外均匀性测试方法研究,提出采用空间分布法对光栅式成像光谱仪的空间均匀性进行测试研究。该方法能准确给出各个位置点信号响应的详细分布,对于提高并改善光栅式成像光谱仪的图谱质量具有重要的意义。空间分布法建立在高稳定性、高均匀性标准光源的基础上,由计算机软件对测试结果进行图谱分离,提取同波长下空间响应信号获得光栅式成像光谱仪的空间均匀性。最后分析了空间均匀性测量不确定度的影响因素,并分析了空间均匀性对绝对辐射定标和光谱精度的影响。

Spatial uniformity is one of the core parameters of the radiation calibration for imaging spectrometer.Based on the research on the test methods of uniformity at home and abroad,a spatial distribution method was proposed to test the spatial uniformity of the grating imaging spectrometer.The detailed distribution of the signal response at each position was accurately obtained by this method,which was of great significance for improving the image and spectrum quality of the grating imaging spectrometer.The spatial distribution method was established based on the standard light source with high stability and high uniformity,the test results were separated by the computer software,and the spatial uniformity of the grating imaging spectrometer was obtained by extracting the spatial response signal at the same wavelength.Finally,the influencing factors of the spatial uniformity measurement uncertainty were analyzed,and the influence of spatial uniformity on the absolute radiation calibration and the spectral accuracy was analyzed.