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Proceedings Paper • Open Access

SIMBIO-SYS STC ready for the first light: the radiometric calibration
Author(s): A. Slemer; E. Simioni; V. Da Deppo; C. Re; M. Dami; D. Borrelli; I. Ficai Veltroni; G. Aroldi; L. Tommasi; M. T. Capria; G. Naletto; R. Mugnolo; M. Amoroso; G. Cremonese

Paper Abstract

The Stereo 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 derived responses will be used to calibrate the STC images that will be acquired in flight. The aim is to derive the functions that link 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-defined quantities: i) the dark current as a function of the integration time and of the detector temperature, nominally fixed at 268 K; ii) the Read Out Noise, which is associated with the noise signal of the read-out electronic; iii) the Fixed Pattern Noise, which is generated by the different response of each pixel; iv) once these quantities are known, the photon response and the Photo Response Non-uniformity, which represent the variation of the photon-responsivity of a pixel in an array, can be derived.

The final 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.

Paper Details

Date Published: 12 July 2019
PDF: 8 pages
Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111807R (12 July 2019); doi: 10.1117/12.2536198
Show Author Affiliations
A. Slemer, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
E. Simioni, INAF – Osservatorio Astronomico di Padova (Italy)
V. Da Deppo, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
C. Re, INAF – Osservatorio Astronomico di Padova (Italy)
M. Dami, Leonardo (Italy)
D. Borrelli, Leonardo (Italy)
I. Ficai Veltroni, Leonardo (Italy)
G. Aroldi, Leonardo (Italy)
L. Tommasi, Leonardo (Italy)
M. T. Capria, INAF-IAPS (Italy)
G. Naletto, Univ. degli Studi di Padova, CNR-IFN (Italy)
R. Mugnolo, Agenzia Spaziale Italiana (Italy)
M. Amoroso, Agenzia Spaziale Italiana (Italy)
G. Cremonese, INAF – Osservatorio Astronomico di Padova (Italy)

Published in SPIE Proceedings Vol. 11180:
International Conference on Space Optics — ICSO 2018
Zoran Sodnik; Nikos Karafolas; Bruno Cugny, Editor(s)

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