Radiometric calibration of the SIMBIO-SYS STereo imaging Channel

Journal
Date Issued
2019
Author(s)
•
Da Deppo, V.
•
•
•
Dami, M.
•
Borrelli, D.
•
Veltroni, I. Ficai
•
Aroldi, G.
•
Tommasi, L.
•
•
Naletto, G.
•
Mugnuolo, R.
•
Amoroso, M.
•
DOI
Abstract
The STereo imaging Channel (STC) is a double wide-angle camera developed to be one of the channels of the SIMBIOSYS 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 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-defined quantities: (1) the dark current as a function of the integration time and of the detector temperature, settled and controlled to be stable at 268 K; (2) the read out noise, which is associated with the noise signal of the read-out electronic; and (3) the fixed pattern noise, which is generated by the different response of each pixel. Once these quantities are known, the photon response and the photoresponse non-uniformity, which represents 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.
Volume
11
Issue
4
Start page
485
Uri
Url
Issn Identifier
1868-2502
Rights
open.access
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