Instrument Information
IDENTIFIER urn:nasa:pds:context:instrument:partizanskoye.1m25_azt11.crao5c::1.1
NAME CRAO FIVE-CHANNEL PHOTOPOLARIMETER
TYPE POLARIMETER
DESCRIPTION The Crimean Astrophysical Observatory (CrAO) Five-Channel Photopolarimeter is capableof simultaneous polarimetric measurements in UBVRI colors, with four dichroic filterssplitting the optical paths of the UBVRI components of white light in such a way asto feed five separate photomultipliers that measure each color simultaneously. Ahalf-wave plate in front of a calcite block splits the incoming radiation into twocomponents with polarization planes mutually orthogonal to each other. Rotation ofthe half-wave plate by steps of 45 degrees and corresponding measurements of theintensities of the two rays allow the observer to derive the values of the Stokesparameters and hence the value of the degree of linear polarization and the positionangle. The construction of the polarimeter allows a direct elimination of the skybackground polarization. For more information, see:Piirola, V., Simultaneous five-color (UBVRI) photopolarimeter, in Coyne, G.V., A.M.Magalhaes, A.F.J. Moffat, R.E. Schulte-Ladbeck, S. Tapia, and D.T. Wickramasinghe(eds.), Polarized Radiation of Circumstellar Origin, Univ. of Arizona Press, Tucson,pp. 735-746, 1989.This book may be difficult to obtain, so a more accessible publication withinformation about the instrument is:Scaltriti, F., V. Piirola, A. Cellino, E. Anderlucci, L. Corcione, G. Massone, F.Racioppi, and F. Porcu, The UBVRI photopolarimeter of the Torino AstronomicalObservatory, Mem. Soc. Astron. It. 60, 243-246, 1989.See also:Korhonen, T., V. Piirola, and A. Reiz, Polarization measurements at La Silla, ESOMessenger, Dec. 1984, p, 20-24.For methods of observation and data processing, see:Shakhovskoy, N.M. 1994. The methods for analysis of polarization observation. Izvestiya Krimskoy Astrophisicheskoy Observatorii 91, 106-123. (In Russian).
MODEL IDENTIFIER
NAIF INSTRUMENT IDENTIFIER
SERIAL NUMBER
REFERENCES Korhonen, T., V. Piirola, and A. Reiz, Polarization measurements at La Silla, ESOMessenger, Dec. 1984, p, 20-24.

Shakhovskoy, N.M., The methods for analysis of polarization observation, Izv.Krimskoy Astrophis. Obs. 91, 106-123, 1994.

Scaltriti, F., V. Piirola, A. Cellino, E. Anderlucci, L. Corcione, G. Massone, F.Racioppi, and F. Porcu, The UBVRI photopolarimeter of the Torino AstronomicalObservatory, Mem. Soc. Astron. It. 60, 243-246, 1989.

Piirola, V., Simultaneous five-color (UBVRI) photopolarimeter, in Coyne, G.V., A.M.Magalhaes, A.F.J. Moffat, R.E. Schulte-Ladbeck, S. Tapia, and D.T. Wickramasinghe(eds.), Polarized Radiation of Circumstellar Origin, Univ. of Arizona Press, Tucson,pp. 735-746, 1989.