Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990liaco..29..149p&link_type=abstract
In ESA, From Ground-Based to Space-Borne Sub-mm Astronomy p 149-152 (SEE N91-21986 13-89)
Astronomy and Astrophysics
Astronomy
4
Cryogenic Cooling, Fabry-Perot Interferometers, Imaging Spectrometers, Imaging Techniques, Infrared Astronomy, Infrared Detectors, Airborne Equipment, Arrays, Far Infrared Radiation, Resolution, Spatial Filtering
Scientific paper
FIFI, an imaging spectrometer with two or three Fabry-Perot Interferometers (FPI) in series for airborne astronomical observations in the far infrared range (lambda = 40 to 200 microns) is described. It employs 5 by 5 arrays of photoconducting detectors and offers spectral resolutions as small as 2 km/s. Resolution and bandwidth can be set over a wide range to match a variety of astronomical sources. Cryogenic optics minimizes thermal background radiation and provides for inflight step tunable spatial resolution. At 158 microns wavelength the background limited NEP is 3 x 10-15 W/Hz at 40 km/s resolution and with two FPI's; with three FPI's the expected NEP is less than or = 10-15 W/Hz km/s resolution. The frequency shopping mode allows for line detection in extended objects. Absolute internal flux calibration ensures adequate flat fielding of the array elements.
Beeman Jeffrey W.
Geis Norbert
Genzel Reinhard
Haggerty Michael
Haller Elmar
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