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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Donati, J.-F., Semel, M., Rees, D.E., Taylor, K., Robinson, R.D.: 1990, A&A 232, L1
Keller, C.U., Aebersold, F., Egger, U., Povel, H.P., Steiner, P., Stenflo, J.O.: 1992, LEST Technical Report 53
Kuhn, J.R.: 1995, in Kuhn, J.R., Penn, M. (eds.), IR Tools for Solar Astrophysics, World Scientific, Singapore, in press
Oakberg, T.C.: 1995, Opt. Eng. 34, 1545
Povel, H.P.: 1995, Opt. Eng. 34, 1870
Povel, H.P., Keller, C.U., Yadigaroglu, I.-A.: 1994, Applied Optics 33, 4254
Rabin, D.M., Jaksha, D., Plymate, C., Wagner, J., Iwata, K.: 1991, in November, L.J. (ed.), Proc. of the 11th Sacramento Peak Summer Workshop on Solar Polarimetry, Sunspot, New Mexico, 361
Rüedi, I., Keller, C.U., Solanki, S.K.: 1996, these proceedings
Semel, M., Donati, J.-F., Rees D.E.: 1993, A&A 278, 231
Stenflo, J.O.: 1996, these proceedings
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Keller, C.U. Recent progress in imaging polarimetry. Sol Phys 164, 243–252 (1996). https://doi.org/10.1007/BF00146637
Issue Date:
DOI: https://doi.org/10.1007/BF00146637