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Proceedings Paper

Reduction of polarimetric data using Mueller calculus applied to Nasmyth instruments
Author(s): Franco Joos; Esther Buenzli; Hans Martin Schmid; Christian Thalmann
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Paper Abstract

We present a method based on Mueller calculus to calibrate linear polarimetric observations. The key advantages of the proposed way of calibration are: (1) that it can be implemented in a data reduction pipeline, (2) that it is possible to do accurate polarimetry also for telescopes/instruments with polarimetric non-friendly architecture (e.g. Nasmyth instruments) and (3) that the proposed strategy is much less time consuming than standard calibration procedures. The telescope/instrument will polarimetrically be described by a train of Mueller matrices. The components of these matrices are dependent on wavelength, incident angle of the incoming light and surface properties. The result is, that an observer gets the polarimetrically calibrated data from a reduction pipeline. The data will be corrected for the telescope/instrumental polarisation off-set and with the position angle of polarisation rotated into sky coordinates. Up to now these two calibration steps were mostly performed with the help of dedicated and time consuming night-time calibration measurements of polarisation standard stars.

Paper Details

Date Published: 12 July 2008
PDF: 11 pages
Proc. SPIE 7016, Observatory Operations: Strategies, Processes, and Systems II, 70161I (12 July 2008); doi: 10.1117/12.788915
Show Author Affiliations
Franco Joos, Institut für Astronomie, ETH Zürich (Switzerland)
Esther Buenzli, Institut für Astronomie, ETH Zürich (Switzerland)
Hans Martin Schmid, Institut für Astronomie, ETH Zürich (Switzerland)
Christian Thalmann, Institut für Astronomie, ETH Zürich (Switzerland)

Published in SPIE Proceedings Vol. 7016:
Observatory Operations: Strategies, Processes, and Systems II
Roger J. Brissenden; David R. Silva, Editor(s)

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