Instrument Information
IDENTIFIER urn:nasa:pds:context:instrument:kpno.boller1m3.kpsc::1.1
NAME KPNO SINGLE CHANNEL POLARIMETER
TYPE POLARIMETER
DESCRIPTION The Single-channel Polarimeter was put into service for the Kitt Peak 36- and 50-inchtelescopes in August 1969. It is similar to one built at the Crimean AstrophysicalObservatory (Shakhovskoy and Dymov 1962). The main element of the device is arapidly rotating polarizer mounted in a circular disk containing 100 radial slotsspaced uniformly around the perimeter. The disk serves to encode the angularposition of the polarizer.A star-chopping technique is used to compensate for sky brightness by means of a pairof closely matched diaphragms in the focal plane. The remainder of the polarimeterincludes a moveable filter slide immediately following the polarizer, and then a Lyotdepolarizer. The final optical element is a CuSO4-5H2O crystal in a moveable slidewhich is used to eliminate red leaks from the shorter-wavelength filters.The observing procedure is to place a star in one diaphragm with an area of adjacentsky in the other. Small systematic differences between the two beams are eliminatedby periodically switching the star from one diaphragm to the other during anobservation. The observer is aided by an oscilloscope display of the accumulatedintensity as a function of polarizer position angle.For further information about the instrument, including a schematic diagram, see Dyckand Sandford (1971).Dyck, H.M and M.T. Sandford II, Multicolor polarimetry of some Mira variables,Astronomical Journal 76, 43-49, 1971.Shakhovskoy, N.M. and N.A. Dymov, Publ. Crimean Astrophys. Obs. 27, 291, 1962.
MODEL IDENTIFIER
NAIF INSTRUMENT IDENTIFIER
SERIAL NUMBER
REFERENCES Dyck, H.M and M.T. Sandford II, Multicolor polarimetry of some Mira variables,Astronomical Journal 76, 43-49, 1971.

Shakhovskoy, N.M. and N.A. Dymov, Publ. Crimean Astrophys. Obs. 27, 291, 1962.