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We present estimates of the response to polarized signals by the PLANCKtelescope. These estimates are based on a set of simulations, using a physicaloptics code (GRASP8), for linearly polarized detectors at different frequenciesand located in different positions of an early design of the PLANCK focalplane. We show how the optical aberration introduced by the studied focal planeconfiguration affects absolute and relative orientation of the sky signalspolarization planes. In addition, we compute the spurious signal introduced bythe telescope optics into a PLANCK-type measurement of the sky polarization.Our analysis shows that the spurious polarization expected in a PLANCK-likeexperiment is typically of the order of 0.2 % of the unpolarized intensity.Comment: Minor Changes. Version accepted by A&

Systematic effects in the measurement of polarization by the PLANCK telescope