An efficient modulation scheme for dual beam polarimetry

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dc.creatorNagaraju, K.
dc.creatorRamesh, K. B.
dc.creatorSankarasubramanian, K.
dc.creatorRangarajan, K. E.
dc.date2007-10-09
dc.date.accessioned2026-07-07T08:34:59Z
dc.date.available2026-07-07T08:34:59Z
dc.descriptionAn eight stage balanced modulation scheme for dual beam polarimetry is presented in this paper. The four Stokes parameters are weighted equally in all the eight stages of modulation resulting in total polarimetric efficiency of unity. The gain table error inherent in dual beam system is reduced by using the well known beam swapping technique. The wavelength dependent polarimetric efficiencies of Stokes parameters due to the chromatic nature of the waveplates are presented. The proposed modulation scheme produces better Stokes $Q$ and $V$ efficiencies for wavelengths larger than the design wavelength whereas Stokes $U$ has better efficiency in the shorter wavelength region. Calibration of the polarimeter installed as a backend instrument of the Kodaikanal Tower Telescope is presented. It is found through computer simulation that a 14% sky transparency variation during calibration of the polarimeter can introduce $\approx 1.8%$ uncertainty in the determination of its response matrix.
dc.descriptionaccepted for publication in BASI
dc.identifierhttps://arxiv.org/abs/0710.1694
dc.identifierhttp://arxiv.org/abs/0710.1694
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139625
dc.subjectAstrophysics
dc.titleAn efficient modulation scheme for dual beam polarimetry
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