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SIMBIO-SYS STC radiometric calibration
The STereo imaging Channel (STC) is a double wide-angle camera developed to be one of the channels of the SIMBIO-SYS instrument onboard of the ESA BepiColombo mission to Mercury. STC main goal is to map in 3D the whole Mercury surface. The geometric and radiometric responses of the STC Proto Flight model have been characterized on-ground during the calibration campaign. The de- rived responses will be used to calibrate the STC images that will be acquired in ight. The aim is to determine the functions linking the detected signal in digital number to the radiance of the target surface in physical units. The result of the radiometric calibration consists in the determination of well-de ned quantities: i) the dark current as a function of the integration time and of the detector temperature, nominally xed at 268 K; ii) the read out noise, which is associated with the noise signal of the read-out electronic; iii) the xed pattern noise, which is generated by the di erent response of each pixel; iv) once these quantities are known, the photon response and the photo-response non-uniformity, which represents the variation of the photon responsivity of a pixel in an array, can be derived. The nal result of the radiometric calibration is the relation between the radiance of an accurately known and uniform source, and the digital numbers measured by the detector.
Slemer Alessandra, Da Deppo Vania, Simioni Emanuele, Re Cristina, Dami Michele, Borrelli Donato, Ficai Veltroni Iacopo, Aroldi Gianluca, Tommasi Leonardo, Capria Maria Teresa, Naletto Giampiero, Mugnuolo Raffaele, Amoroso Marilena, Cremonese Gabriele
Paper for Specialistic Magazine
CEAS Space Journal (Official Journal of the Council of European Aerospace Societies)
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