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Proceedings Paper

Field imaging far-infrared line spectrometer FIFI LS
Author(s): Walfried Raab; Norbert Geis; Leslie W. Looney; Albrecht Poglitsch; Dirk Rosenthal; Alexander Urban; Thomas Henning; Jeffrey W. Beeman
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Paper Abstract

We present our design for a field-imaging, far-infrared line spectrometer for the SOFIA airborne observatory. The instrument will employ two parallel, medium resolution (R approximately 1700) grating spectrometers for simultaneous observations in the wavelength bands 42 - 110 micrometer and 110 - 210 micrometer. The Littrov mounted gratings are operated in first and second order. Large stressed and unstressed 16 X 25 pixel Ge:Ga photoconductor arrays are operated in the spectrometer channel, providing good spectral coverage with high responsivity. Image slicers in each spectrometer branch redistribute the 5 X 5 pixel field of view along the 1 X 25 pixel entrance slits of the spectrographs, providing both, spatial and spectral multiplexing. Thus, for each of the 25 spatial pixels, we are able to cover a velocity range of approximately 1500 km/s around a selected far infrared line, with an estimated sensitivity of approximately 2 X 10-15 W Hz-1/2 per pixel.

Paper Details

Date Published: 6 December 1999
PDF: 11 pages
Proc. SPIE 3759, Infrared Spaceborne Remote Sensing VII, (6 December 1999); doi: 10.1117/12.372662
Show Author Affiliations
Walfried Raab, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Norbert Geis, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Leslie W. Looney, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Albrecht Poglitsch, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Dirk Rosenthal, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Alexander Urban, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Thomas Henning, Friedrich-Schiller-Univ. Jena (Germany)
Jeffrey W. Beeman, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 3759:
Infrared Spaceborne Remote Sensing VII
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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