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2 February 2004 Spectral features on reference diffusers: measurements and analysis
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In the accurate radiometric calibration of earth observation instruments, diffusers are used as “white-references”. In the frame of on-ground calibration campaigns of instruments such as SCIAMACHY, GOME2 and OMI (all using on-board diffusers), which took place at TNO TPD, a modulation of the reflectance signal in the spectral domain was discovered. This modulation appears when two spectra, recorded under slightly different conditions, are compared. This modulation, referred to here as Spectral features, reduces the accuracy of spectrometers as used in earth observation satellites. The spectral features are caused by speckle phenomena in the entrance slit of the spectrometer. The work reported here describes the origin of the spectral features, the measurements performed in order to reproduce and characterize this effect and the result of simulations performed on speckle patterns thanks to a dedicated analysis tool. A new set-up dedicated to spectral features measurements is also described.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gregory Bazalgette Courreges-Lacoste, Hedser van Brug, Jos Groote Schaarsberg, Bart Snijders, Rudolf Sprik, Ramon Vink, and Dolf de Winter "Spectral features on reference diffusers: measurements and analysis", Proc. SPIE 5234, Sensors, Systems, and Next-Generation Satellites VII, (2 February 2004);


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