Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984abas.symp..335d&link_type=abstract
In NASA. Ames Research Center Airborne Astron. Symp. p 335-340 (SEE N85-17848 08-89)
Astronomy and Astrophysics
Astronomy
Airborne Equipment, Millimeter Waves, Polarimetry, Polarization (Waves), Submillimeter Waves, C-135 Aircraft, Data Acquisition, Error Analysis, Reflectance, Sapphire, Telescopes
Scientific paper
During the last two years three instruments were built and operated for detection of polarization in the submillimeter to millimeter wavelength bands. In principle, simply rotating a polarizing grid in front of the detector would be sufficient to determine the state of linear polarization. In practice severe systematic problems are found with this approach. Everything in the light path has potential for inducing polarization. The telescope, apertures in the lightpath, and the Winston light collectors all introduce systematic errors. (The polarization/depolarization induced by these devices is due to diffraction and the finite conductivity of the metals used). Two of the polarimeters are for use on the KAO; the third is for the IRTF on Mauna Kea. The airplane polarimeters, M1 and M2, were specifically designed to minimize the systematic errors. The ground based polarimeter uses our f/35 photometer with an external polarizing grid as the analyzer. With all three instruments the key to success is the data collector and analysis scheme.
Dragovan Mark
Novak Giles
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