Abstract. Wide-field spectrometers for Earth Observation missions require inflight radiometric calibration, for which the sun can be used as a known reference. Therefor a diffuser is placed in front of the spectrometer in order to scatter the incoming light into the entrance slit and provide homogeneous illumination. The diffuser however, introduces interference patterns known as speckles into the system, yielding potentially significant intensity variations at the detector plane, called Spectral Features. There have been several approaches implemented to characterize the Spectral Features of a spectrometer, e.g. end-to-end measurements with representative instruments. Additionally, in previous publications a measurement technique was proposed, which is based on the acquisition of monochromatic speckles in the entrance slit following a numerical propagation through the disperser to the detection plane. Based on this measurement technique we present a standalone prediction model for the magnitude of Spectral Features in imaging spectrometers, requiring only few input parameters and therefor mitigating the need for expensive measurement campaigns.

中文翻译：

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成像光谱仪中扩散器引起的光谱特征的预测模型

摘要。用于地球观测任务的广角光谱仪需要进行机内辐射定标，为此可以将太阳用作已知参考。因此，在光谱仪的前面放置一个漫射器，以将入射的光散射到入射狭缝中并提供均匀的照明。然而，漫射器将被称为斑点的干涉图样引入系统，从而在检测器平面上产生潜在的显着强度变化，称为光谱特征。已经实施了几种方法来表征光谱仪的光谱特征，例如，使用代表性仪器进行的端到端测量。此外，在先前的出版物中，提出了一种测量技术，这是基于在通过分散器到检测平面的数值传播之后在入口狭缝中获取单色斑点的结果。基于这种测量技术，我们提出了一个独立的预测模型，用于成像光谱仪中光谱特征的大小，仅需要很少的输入参数，从而减轻了对昂贵的测量活动的需求。