Using KD*P modulators to measure the Stokes vector on the Sun.

Details Using KD*P modulators to measure the Stokes vector on the Sun. Using KD*P modulators to measure the Stokes vector on the Sun.

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sopo.work..182w&link_type=abstract

Solar Polarimetry, Proceedings of the 11th Sacramento Peak Summper Workshop. Edited by L.J. November. Sunspot, NM: National Sola

Computer Science

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Longitudinal KD*P modulators are used in ground-based solar magnetographs to eliminate seeing effects. Although these modulators can be used as variable retarders, their optical properties when zero voltage is applied will influence their performance in instruments requiring very accurate polarization measurements. This paper discusses measurements that are being made at the Marshall Space Flight Center on the optical properties of different KD*P modulators when zero voltage is applied and how these properties affect their performance in the Marshall vector magnetograph. The temperature dependence, field of view errors, polarization fringing and the dc bias problems are also discussed.

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