Submillimeter Polarimetry Using Variable-delay Polarization Modulators

Details Submillimeter Polarimetry Using Variable-delay Polarization Modulators Submillimeter Polarimetry Using Variable-delay Polarization Modulators

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.8806c&link_type=abstract

American Astronomical Society Meeting 207, #88.06; Bulletin of the American Astronomical Society, Vol. 37, p.1316

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe the development effort currently underway to integrate Variable-delay Polarization Modulators (VPMs) into a ground-based submillimeter polarimeter. VPMs allow the modulation of a polarized source by controlling the phase difference between two linear orthogonal polarizations. Such modulators have the following advantages over traditional modulators such as wave plates: 1. VPMs can be used to measure both circular and linear polarization, 2. VPMs are intrinsically capable of broadband, multi-frequency operation, and 3. The small, linear motions required to operate VPMs allows the use of frictionless bearings, making them potentially more durable than rotating wave plate systems. A pair of VPMs is currently under development to be used in a 350 micron polarimetery system at the University of Arizona's SMTO. We will describe the polarimeter, present laboratory test data on the modulators, and report on the progress of the instrument. First light is anticipated in February 2006. This work has been funded through NASA award APRA04-0077-0150.

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