Hydrogen cells as narrowband geo-coronal Lyman-alpha rejection filters for astrophysical photometry

Keith Redwine; Stephan R. McCandliss; Brian T. Fleming; Russell Pelton

doi:10.1117/12.2024346

26 September 2013 Hydrogen cells as narrowband geo-coronal Lyman-alpha rejection filters for astrophysical photometry

Keith Redwine, Stephan R. McCandliss, Brian T. Fleming, Russell Pelton

Proceedings Volume 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII; 88590P (2013) https://doi.org/10.1117/12.2024346
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

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.

Citation Download Citation

Keith Redwine, Stephan R. McCandliss, Brian T. Fleming, and Russell Pelton "Hydrogen cells as narrowband geo-coronal Lyman-alpha rejection filters for astrophysical photometry", Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590P (26 September 2013); https://doi.org/10.1117/12.2024346

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