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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 33, Iss. 19 — Jul. 1, 1994
  • pp: 4254–4260

Optics InfoBase > Applied Optics > Volume 33 > Issue 19 > Two-dimensional polarimeter with a charge-coupled-device image sensor and a piezoelastic modulator

Two-dimensional polarimeter with a charge-coupled-device image sensor and a piezoelastic modulator

H. P. Povel, C. U. Keller, and I.-A. Yadigaroglu  »View Author Affiliations


Applied Optics, Vol. 33, Issue 19, pp. 4254-4260 (1994)
http://dx.doi.org/10.1364/AO.33.004254


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Abstract

We present the first measurements and scientific observations of the solar photosphere obtained with a new two-dimensional polarimeter based on piezoelastic modulators and synchronous demodulation in a CCD imager. This instrument, which is developed for precision solar-vector polarimetry, contains a specially masked CCD that has every second row covered with an opaque mask. During exposure the charges are shifted back and forth between covered and light-sensitive rows synchronized with the modulation. In this way Stokes I and one of the other Stokes parameters can be recorded. Since the charge shifting is performed at frequencies well above the seeing frequencies and both polarization states are measured with the same pixel, highly sensitive and accurate polarimetry is achieved. We have tested the instrument in laboratory conditions as well as at three solar telescopes.

© 1994 Optical Society of America

History
Original Manuscript: December 10, 1992
Revised Manuscript: November 1, 1993
Published: July 1, 1994

Citation
H. P. Povel, C. U. Keller, and I.-A. Yadigaroglu, "Two-dimensional polarimeter with a charge-coupled-device image sensor and a piezoelastic modulator," Appl. Opt. 33, 4254-4260 (1994)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-33-19-4254


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References

  1. H. P. Povel, H. Aebersold, J. O. Stenflo, “Charge-coupled device image sensor as a demodulator in a 2-D polarimeter with a piezoelastic modulator,” Appl. Opt. 29, 1186–1190 (1990). [CrossRef] [PubMed]
  2. H. S. Stockman, “Differential imaging using charge-coupled image device (CCD) imagers with on-chip charge storage,” in Instrument in Astronomy IV, D. L. Crawford, ed., Proc. Soc. Photo-Opt. Instrum. Eng. 331, 76–80 (1982).
  3. C. U. Keller, F. Aebersold, U. Egger, H. P. Povel, P. Steiner, J. O. Stenflo, “Züich imaging Stokes polarimeter ZIMPOL I—design review,” LEST Tech. Rep. 53 (Institute of Theoretical Astrophysics, University of Oslo, Oslo, 1992).
  4. J. C. Kemp, “Piezo-optical birefringence modulators,” J. Opt. Soc. Am. 59, 950–954 (1969).
  5. I. Yadigaroglu, “Prototype CCD solar polarimeter: evaluation experiments and calibration,” term thesis (Eidgenössische Technische Hochschule, 1991).
  6. D. J. Thorne, N. R. Waltham, G. M. Newton, I. G. van Breda, M. Fisher, P. J. Rudd, “CCD guidance system for the William Herschel telescope,” in Instrumentation in Astronomy VII, D. L. Crawford, ed., Proc. Soc. Photo-opt. Instrum. Eng. 1235, 400–412 (1990).
  7. J. O. Stenflo, C. U. Keller, H. P. Povel, “Demodulation of all four Stokes parameters with a single CCD ZIMPOL II—conceptual design,” LEST Tech. Rep. 54 (Institute of Theoretical Astrophysics, University of Oslo, Oslo, 1992).

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