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Proceedings Paper • Open Access

Preliminary results of the optical calibration for the stereo camera STC onboard the Bepicolombo mission
Author(s): V. Da Deppo; E. Martellato; E. Simioni; D. Borrelli; M. Dami; G. Aroldi; G. Naletto; I. Ficai Veltroni; G. Cremonese

Paper Abstract

BepiColombo is one of the cornerstone missions of the European Space Agency dedicated to the exploration of the planet Mercury and it is expected to be launched in July 2016.

One of the BepiColombo instruments is the STereoscopic imaging Channel (STC), which is a channel of the Spectrometers and Imagers for MPO BepiColombo Integrated Observatory SYStem (SIMBIOSYS) suite: an integrated system for imaging and spectroscopic investigation of the Mercury surface. STC main aim is the 3D global mapping of the entire surface of the planet Mercury during the BepiColombo one year nominal mission.

The STC instrument consists in a novel concept of stereocamera: two identical cameras (sub-channels) looking at ±20° from nadir which share most of the optical components and the detector. Being the detector a 2D matrix, STC is able to adopt the push-frame acquisition technique instead of the much common push-broom one.

The camera has the capability of imaging in five different spectral bands: one panchromatic and four intermediate bands, in the range between 410 and 930 nm.

To avoid mechanisms, the technical solution chosen for the filters is the single substrate stripe-butted filter in which different glass pieces, with different transmission properties, are glued together and positioned just in front of the detector.

The useful field of view (FoV) of each sub-channel, though divided in 3 strips, is about 5.3° x 3.2°. The optical design, a modified Schmidt layout, is able to guarantee that over all the FoV the diffraction Ensquared Energy inside one pixel of the detector is of the order of 70-80%.

To effectively test and calibrate the overall STC channel, an ad hoc Optical Ground Support Equipment has been developed. Each of the sub-channels has to be separately calibrated, but also the data of one sub-channel have to be easily correlated with the other one.

In this paper, the experimental results obtained by the analysis of the data acquired during the preliminary onground optical calibration campaign on the STC Flight Model will be presented.

This analysis shows a good agreement between the theoretical expected performance and the experimental results.

Paper Details

Date Published: 17 November 2017
PDF: 8 pages
Proc. SPIE 10563, International Conference on Space Optics — ICSO 2014, 105635I (17 November 2017); doi: 10.1117/12.2304124
Show Author Affiliations
V. Da Deppo, CNR-IFN Padova (Italy)
E. Martellato, Univ. of Padova (Italy)
E. Simioni, CNR-IFN Padova (Italy)
D. Borrelli, SELEX ES (Italy)
M. Dami, SELEX ES (Italy)
G. Aroldi, SELEX ES (Italy)
G. Naletto, Univ. of Padova (Italy)
Department of Information Engineering (Italy)
CISAS (Italy)
I. Ficai Veltroni, SELEX ES (Italy)
G. Cremonese, INAF - Osservatorio Astronomico di Padova (Italy)

Published in SPIE Proceedings Vol. 10563:
International Conference on Space Optics — ICSO 2014
Zoran Sodnik; Bruno Cugny; Nikos Karafolas, Editor(s)

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