Abstract

A formalism for estimating the crosstalk error among Stokes I,Q,U,V introduced by seeing-induced image motion is presented. This formalism is applied to several modulation schemes for polarization involving rotating waveplates, and it is evaluated using an observed power spectrum of image motion obtained from the Vacuum Tower Telescope at the National Solar Observatory/Sunspot. It is shown that rotating waveplates offer an acceptable alternative for measurements of absorption line polarization of features observed on the solar disk, provided the detection can be carried out at video frame rates or faster.

© 1987 Optical Society of America

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