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Proceedings Paper

Hydrogen cells as narrowband geo-coronal Lyman-alpha rejection filters for astrophysical photometry
Author(s): Keith Redwine; Stephan R. McCandliss; Brian T. Fleming; Russell Pelton
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Paper Abstract

The Johns Hopkins University rocket group is seeking to develop a hydrogen absorption cell to act as narrowband H I Lyα rejection filters for ultraviolet solar blind imaging detectors. A heated tungsten filament in the cell produces free atomic hydrogen by dissociation of molecular hydrogen contained in the cell. This creates a gas that is optically thick to the Lyα , effectively filtering out incident geo-coronal Lyα emission. This suppression of geo-coronal light will in principle make possible imaging observations of astrophysical sources into the far-UV below 1200 Å, down to the lithium-fluoride transmission edge near 1040Å. The flux attenuation of a hydrogen cell has been measured in a vacuum monochrometer testbed. The goal is to produce a usable hydrogen cell design that can be easily mounted on a detector for photometric observations of astronomical sources in the far-UV.

Paper Details

Date Published: 26 September 2013
PDF: 5 pages
Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590P (26 September 2013); doi: 10.1117/12.2024346
Show Author Affiliations
Keith Redwine, Johns Hopkins Univ. (United States)
Stephan R. McCandliss, Johns Hopkins Univ. (United States)
Brian T. Fleming, Johns Hopkins Univ. (United States)
Russell Pelton, Johns Hopkins Univ. (United States)


Published in SPIE Proceedings Vol. 8859:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII
Oswald H. Siegmund, Editor(s)

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