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.
| Original language | English |
|---|---|
| Article number | 012002 |
| Number of pages | 5 |
| Journal | Journal of Physics: Conference Series |
| Volume | 972 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2 Mar 2018 |
| MoE publication type | A4 Conference publication |
| Event | International Conference on New Developments and Applications in Optical Radiometry - Tokyo, Japan Duration: 13 Jun 2017 → 16 Jun 2017 Conference number: 13 |
Funding
This work has been supported by the European Metrology Research Programme (EMRP) within the joint research project ENV53 European metrology for Earth observation and climate (MetEOC2). The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union. A.V. is grateful for the travel grant by the Finnish Foundation for Technology Promotion. Lydia Zajiczek, Paul Miller, Paul Green, Barry Scott and Florian Graber are acknowledged for their technical feedback and for sharing their expert knowledge in optics. Authors thank Petri Kärhä for helping with the funding applications.
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