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Abstract
Diffusers in in-orbit spectroradiometers cause speckle under partially coherent solar radiation. A speckle pattern entering a spectroradiometer through a small slit creates systematic spectral deviations in measured spectra. We have developed a setup to characterise the spatial speckle of diffusers and the related spectral features. The decorrelation angles measured at 532 nm for Spectralon, Diffusil, and Heraeus diffusers were 0.021°, 0.014°, and 0.005° respectively. This information can be used for compensating speckle-related spectral features from the radiometric satellite measurements by averaging over multiple decorrelated spectra.
Highlights
Diffuser speckle is the result of constructive and destructive interference arising from the surface roughness [1,2]
We have developed a setup to characterise the spatial speckle of diffusers and the related spectral features
Speckle-related spectral features in satellite spectroradiometer measurements can be attenuated effectively by averaging over the spectra measured at slightly different angles [1,2]
Summary
Diffuser speckle is the result of constructive and destructive interference arising from the surface roughness [1,2]. Diffusers in in-orbit spectroradiometers cause speckle under partially coherent solar radiation. A speckle pattern entering a spectroradiometer through a small slit creates systematic spectral deviations in measured spectra.
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