短波红外高光谱成像仪背景辐射特征研究

Characterization of background radiation in SWIR hyperspectral imager

文章指出背景辐射对短波红外高光谱成像仪辐射精度、信噪比是有影响的.给出了色散型短波红外光谱仪的背景辐射定量计算模型,分析了温度及温度变化与辐射精度的关系,并通过实验数据进行了验证.在背景辐射特征分析的基础上,分析总结了小相对孔径冷屏、高精度温控、冷光学、经常性标定等几种减小背景辐射影响的措施.本文的研究工作对于提高高光谱成像仪研制的定量化水平具有参考价值.

It is proved that the radiometric accuracy of short wave infrared（SWIR） hyperspectral imager and its signal-to-noise ratio could be affected by the background radiation.The quantified computing model of background radiation of dispersive SWIR hyperspectral imager is given.The relationship between the temperature and the radiometric accuracy is analyzed,which was demonstrated by experiments.Based on the analysis of the characteristics of background radiation,several methods of reducing the influence of background radiation were summarized,such as cold shield of small relative aperture,temperature controlling with high precision,cold optics,regular calibration and so on.The results in this paper is helpful to improve the quantification accuracy of hyperspectral imager.