Cal/wfpc Cycle 3 Polarization Calibration

Details Cal/wfpc Cycle 3 Polarization Calibration Cal/wfpc Cycle 3 Polarization Calibration

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.5023s&link_type=abstract

HST Proposal ID #5023

Physics

Optics

Hst Proposal Id #5023 Cal

Scientific paper

This proposal will acquire data on unpolarized and polarized standard fields through the WFPC polarizing optics in order to derive a minimal calibration of the polarizarion mode. The sources of the WFPC instrumental signature are: the spurious linear polarization introduced by the OTA and by the pre-polarimeter reflections within the camera, quantum efficiency variations to light polarized in different directions, and differences in the transmissions of the 3 polacoat filters. The spurious polarization introduced by the pickoff mirror may be as large as 5% at 8000A and 2.5% at 5000A. An unpolarized field will be observed in several bandpasses through the polarizing filters to derive the transmission and the instrumental polarization. A high-polarization field will be measured in a bandpass to derive the orientation correction and estimate the polarization efficiency at that wavelength.

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