Calibrating CMB polarization telescopes

Details Calibrating CMB polarization telescopes Calibrating CMB polarization telescopes

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..609..183s&link_type=abstract

ASTROPHYSICAL POLARIZED BACKGROUNDS: Workshop on Astrophysical Polarized Backgrounds, held 9-12 October, 2001 in Bologna Italy.

Physics

5

Background Radiations, Radiation Mechanisms, Polarization, Photometric, Polarimetric, And Spectroscopic Instrumentation, Radio Telescopes And Instrumentation, Heterodyne Receivers

Scientific paper

Instruments for measuring the polarization of the cosmic microwave background (CMB) must be designed for accuracy as well as precision. The requirement for precision translates into a need for detectors with unprecedented sensitivity. Accuracy requires good methods for calibrating the response of the instrument to small polarized signals superimposed on large unpolarized signals. Since well-characterized polarized astrophysical millimeter sources are in short supply, we present an alternative method here. A flat metal plate is mounted in front of the telescope and nutated about a vertical axis, providing a varying polarized signal of amplitude near 30 mK. .

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