urn:nasa:pds:context:instrument:kpno.boller1m3.kpsc 1.3 1.25.0.0 Product_Context 2026-07-07 1.3 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.2 Updated schema version. Adding missing "telescope" references. 2025-01-02 1.1 Updated schema version. Update instrument type/subtype to use valid CTLI LDD. 2020-02-18 1.0 Initial export from OLAF urn:nasa:pds:context:telescope:kpno.boller1m3 instrument_to_telescope 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. KPNO Single Channel Polarimeter Polarimeter The Single-channel Polarimeter, operational since August 1969 at the Kitt Peak 36- and 50-inch telescopes, features a rapidly rotating polarizer and employs a star-chopping technique to manage sky brightness. Its design, inspired by a device from the Crimean Astrophysical Observatory, includes a moveable filter, a Lyot depolarizer, and a CuSO4-5H2O crystal to eliminate red leaks. The observing process involves switching the star between two diaphragms to mitigate beam differences, with an oscilloscope aiding in data collection. Further details and a schematic can be found in Dyck and Sandford (1971).