Abstract
Phase retardation originating in a telescope is measured by means of polarizer and analyzer. The amount of this retardation depends only on the declination δ of the telescope. The retardation axes rotate with the Coudé image.
The influence of this retardation on a Zeeman triplet, is measured photoelectrically. Consequences for solar polarimetry are discussed: Strong effects originate from the miscentering of the asymmetric Zeeman triplet introduced by the Doppler compensator. This yields a non-vanishing V-Stokes parameter in the central exit slit and thus the often observed crosstalk between the U and V-Stokes parameters.
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Wiehr, E. On polarimetry in solar active regions. Sol Phys 18, 226–231 (1971). https://doi.org/10.1007/BF00145935
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DOI: https://doi.org/10.1007/BF00145935