Field imaging far-infrared line spectrometer FIFI LS

Walfried Raab; Norbert Geis; Leslie W. Looney; Albrecht Poglitsch; Dirk Rosenthal; Alexander Urban; Thomas Henning; Jeffrey W. Beeman

doi:10.1117/12.372662

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6 December 1999 Field imaging far-infrared line spectrometer FIFI LS

Walfried Raab, Norbert Geis, Leslie W. Looney, Albrecht Poglitsch, Dirk Rosenthal, Alexander Urban, Thomas Henning, Jeffrey W. Beeman

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Proceedings Volume 3759, Infrared Spaceborne Remote Sensing VII; (1999) https://doi.org/10.1117/12.372662
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

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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); https://doi.org/10.1117/12.372662

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