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Proceedings Paper

Tests of the demodulating CCDs for the SPHERE / ZIMPOL imaging polarimeter
Author(s): Hans-Martin Schmid; Mark Downing; Ronald Roelfsema; Andreas Bazzon; Daniel Gisler; Johan Pragt; Claudio Cumani; Bernardo Salasnich; Alexey Pavlov; Andrea Baruffolo; Jean-Luc Beuzit; Anne Costille; Sebastian Deiries; Kjetil Dohlen; Carsten Dominik; Eddy Elswijk; Markus Feldt; Markus Kasper; David Mouillet; Christian Thalmann; François Wildi
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Paper Abstract

The imaging polarimeter ZIMPOL is one of three focal plane instruments of the SPHERE / VLT planet finder. ZIMPOL measures the linear polarization based on a fast modulation – demodulation principle using a charge-shifting technique on a masked CCD for separating the photons with opposite polarization direction. This paper describes the on-chip demodulation and the different detector read-out modes which are implemented for the ZIMPOL polarimeter. Test results are presented which allow an evaluation of the performance of the ZIMPOL CCD detectors. The achievable polarization efficiency is close to expectation and the charge trap correction with the two-phase demodulation mode works well. Other detector effects like bias level variations and read-out patterns can be corrected in the data reduction process. The tests demonstrate that the demodulating CCDs fulfill the requirements for the SPHERE project.

Paper Details

Date Published: 24 September 2012
PDF: 13 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84468Y (24 September 2012); doi: 10.1117/12.925886
Show Author Affiliations
Hans-Martin Schmid, ETH Zürich (Switzerland)
Mark Downing, European Southern Observatory (Germany)
Ronald Roelfsema, NOVA - ASTRON (Netherlands)
Andreas Bazzon, ETH Zürich (Switzerland)
Daniel Gisler, ETH Zürich (Switzerland)
Johan Pragt, NOVA - ASTRON (Netherlands)
Claudio Cumani, European Southern Observatory (Germany)
Bernardo Salasnich, INAF - Osservatorio Astronomico di Padova (Italy)
Alexey Pavlov, Max-Planck-Institut für Astronomie (Germany)
Andrea Baruffolo, INAF - Osservatorio Astronomico di Padova (Italy)
Jean-Luc Beuzit, Institut de Planetologie et d'Astrophysique de Grenoble, Univ. Joseph Fourier (France)
Anne Costille, Institut de Planetologie et d'Astrophysique de Grenoble, Univ. Joseph Fourier (France)
Sebastian Deiries, European Southern Observatory (Germany)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, Observatoire Astronomique de Marseille-Provence (France)
Carsten Dominik, Astronomical Institute Anton Pannekoek, Univ. of Amsterdam (Netherlands)
Eddy Elswijk, NOVA - ASTRON (Netherlands)
Markus Feldt, Max-Planck-Institut für Astronomie (Germany)
Markus Kasper, European Southern Observatory (Germany)
David Mouillet, Institut de Planetologie et d'Astrophysique de Grenoble, Univ. Joseph Fourier (France)
Christian Thalmann, Astronomical Institute Anton Pannekoek, Univ. of Amsterdam (Netherlands)
François Wildi, Observatoire de l'Univ. de Genève (Switzerland)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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