Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....74..118c&link_type=abstract
Astronomy and Astrophysics, vol. 74, no. 1, Apr. 1979, p. 118-120.
Astronomy and Astrophysics
Astrophysics
Astrometry, Linear Polarization, Optical Polarization, Polarimeters, Retarders (Devices), Circular Polarization, Instrument Orientation, Optical Measuring Instruments, Polarimetry, Polarizers
Scientific paper
A modification of the Dollfus stellar polarimeter for linear polarization measurements is suggested. The optical train consists of a polarizer behind a rotating sector disk made up of 0- and 180-deg circular retarders. The square-wave modulation of the Dollfus design is retained, while the sector disk can be made from existing Pancharatnam-type linear retarders such that an almost perfect analyzer is achieved, with uniform retardation and no variation of axis tilt with wavelength over the range 0.35-1 micron. A generalization of the modification process shows that a square-wave-modulation linear polimeter is possible where only one set of measurements is required to determine both the amount and orientation of plane polarization.
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