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6 December 1999 Field imaging far-infrared line spectrometer FIFI LS
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Walfried Raab, Norbert Geis, Leslie W. Looney, Albrecht Poglitsch, Dirk Rosenthal, Alexander Urban, Thomas Henning, and Jeffrey W. Beeman "Field imaging far-infrared line spectrometer FIFI LS", Proc. SPIE 3759, Infrared Spaceborne Remote Sensing VII, (6 December 1999);


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