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Proceedings Paper

FIRAS Wire Grid Characterization Techniques
Author(s): Richard D. Barney; Thomas J. Magner
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Paper Abstract

Characterization techniques used to verify the quality and spectral performance of the large free standing wire grid polarizing beamsplitters and input/output polarizers used in the Far Infrared Absolute Spectrophotometer (FIRAS) are presented. The clear aperture of these grids is lined with 20.8 micron diameter gold coated tungsten wire, spaced 33 microns apart. The grid characteristics measured throughout fabrication and space flight qualification are the center to center wire spacing and wire plane flatness. Ideally, the wire grids should produce coherent wavefronts with equal reflectance and transmittance properties. When the spacing is inconsistent, these wavefront intensities are unequal, thus decreasing the efficiency of the grids and reducing the output signal of the FIRAS. The magnitude of the output interferogram is also reduced by incoherence in the interfering wave fronts caused by uneven flatness.

Paper Details

Date Published: 27 April 1988
PDF: 9 pages
Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); doi: 10.1117/12.948357
Show Author Affiliations
Richard D. Barney, NASA/Goddard Space Flight Center (United States)
Thomas J. Magner, NASA/Goddard Space Flight Center (United States)

Published in SPIE Proceedings Vol. 0973:
Cryogenic Optical Systems and Instruments III
Ramsey K. Melugin; Warren G. Pierce, Editor(s)

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