Recent progress in imaging polarimetry |
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| Authors: | C U Keller |
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| Institution: | (1) National Solar Observatory, P.O.Box 26732, 85726-6732 Tucson, AZ, USA |
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| 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. |
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| Keywords: | Polarimetry Spectroscopy Array detectors |
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