Solar Physics

, Volume 164, Issue 1–2, pp 243–252 | Cite as

Recent progress in imaging polarimetry

  • C. U. Keller
Article

Abstract

Recent instrumental developments in imaging polarimetry allow array detectors to reach a polarimetric sensitivity of 1 × 10−4 of the intensity. New instrumental effects appear at these levels of sensitivity and generate spurious polarization signals with amplitudes of up to 5 × 10−4. Here I discuss these effects and present methods to avoid them. Polarized spectra with an rms noise of 6 × 10−6 may then be obtained. Furthermore a method is brought to the reader's attention that allows polarization measurements at the 1 × 10−4 level with regular array detectors, e.g. in the near-infrared.

Key words

Polarimetry Spectroscopy Array detectors 

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References

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • C. U. Keller
    • 1
  1. 1.National Solar ObservatoryTucsonUSA

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