A large, free-standing wire grid for microwave variable-delay polarization modulation

G. M. Voellmer, C. Bennett, D. T. Chuss, J. Eimer, H. Hui, S. H. Moseley, Giles A Novak, E. J. Wollack, L. Zeng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

One technique for mapping the polarization signature of the cosmic microwave background uses large, polarizing grids in reflection. We present the system requirements, the fabrication, assembly, and alignment procedures, and the test results for the polarizing grid component of a 50 cm clear aperture, Variable-delay Polarization Modulator (VPM). This grid is being built and tested at the Goddard Space Flight Center as part of the Polarimeter for Observing Inflationary Cosmology at the Reionization Epoch (POINCARE).For the demonstration instrument, 64 um diameter tungsten wires are being assembled into a 200 ?m pitch,freestanding wire grid with a 50 cm clear aperture, and an expected overall flatness better than 30 um. A rectangular,aluminum stretching frame holds the wires with sufficient tension to achieve a minimum resonant frequency of 185 Hz,allowing VPM mirror translation frequencies of several Hz. A lightly loaded, flattening ring with a 50 cm inside diameter rests against the wires and brings them into accurate planarity.

Original languageEnglish (US)
Title of host publicationGround-based and Airborne Instrumentation for Astronomy II
Volume7014
DOIs
StatePublished - Dec 1 2008
EventGround-based and Airborne Instrumentation for Astronomy II - Marseille, France
Duration: Jun 23 2008Jun 28 2008

Other

OtherGround-based and Airborne Instrumentation for Astronomy II
CountryFrance
CityMarseille
Period6/23/086/28/08

Keywords

  • Cosmic microwave background
  • Polarization
  • Polarizing grids

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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