NASA NTRS · 20140013294
Variable-Delay Polarization Modulators for Cryogenic Millimeter-Wave Applications
Abstract
We describe the design, construction, and initial validation of the variable-delay polarization modulator (VPM) designed for the PIPER cosmic microwave background polarimeter. The VPM modulates between linear and circular polarization by introducing a variable phase delay between orthogonal linear polarizations. Each VPM has a diameter of 39 cm and is engineered to operate in a cryogenic environment (1.5 K). We describe the mechanical design and performance of the kinematic double-blade flexure and drive mechanism along with the construction of the high precision wire grid polarizers.
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Chuss, D. T., Eimer, J. R., Fixsen, D. J., Hinderks, J., Kogut, A. J., Lazear, J., Mirel, P., Switzer, E., Voellmer, G. M., Wollack, E. J... 2014-05-12. Variable-Delay Polarization Modulators for Cryogenic Millimeter-Wave Applications. https://ntrs.nasa.gov/citations/20140013294
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