红外光谱辐射亮度测量中温度均匀性和源尺寸效应的研究

在已有的紫外、可见和近红外波段的光谱辐射亮度国家基准的基础上，将光谱辐射亮度的测量范围向红外波段扩展，建立2 μm～14 μm红外光谱辐射亮度计量基准装置，可为遥感对地观测、气候变化、目标识别、材料发射率测量等领域的红外光谱辐射定标提供技术支撑。针对红外光谱辐射亮度测量中的温度均匀性和源尺寸效应进行研究，通过定制光阑或限制所用腔口位置实现了温度均匀性的提升；采用光学仿真、增加光阑和简化光路等方法进行了系统源尺寸效应的分析和抑制，有效地降低了源尺寸效应的不确定度。下一步将对系统的非线性效应等参数进行研究，并对整套系统的不确定度进行评估。

Research of temperature uniformity and size-of-source effect in infrared spectral radiance measurement

Based on the existing national primary spectral radiance measurement facilities in the ultraviolet, visible and near-infrared wave bands, the measurement range of spectral radiance was extended to 2 μm~14 μm infrared band, which could be used for the metering calibration device of infrared spectral radiance and provided technical support for infrared spectral radiometric calibration in the fields of remote sensing earth observation, climate change, target recognition, material emissivity measurement and so on. The temperature uniformity and size-of-source effect of infrared spectral radiance measurement were studied. The temperature uniformity was improved by customizing the apertures or limiting the cavity position to be used in the system; the analysis and suppression of size-of-source effect were carried out by using optical simulation method, adopting limiting apertures in the system, simplifying the optical path and so on, which effectively decreased the uncertainty of the size-of-source effect. Next, the nonlinear effect and other parameters of the system will be studied, and the total uncertainty will be evaluated.