Physics – Optics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26.3838l&link_type=abstract
Applied Optics (ISSN 0003-6935), vol. 26, Sept. 15, 1987, p. 3838-3845.
Physics
Optics
39
Circular Polarization, Crosstalk, Linear Polarization, Solar Observatories, Stokes Law, Beam Splitters, Error Analysis, Fourier Transformation, Noise Spectra, Power Spectra
Scientific paper
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.
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