The MPE/UCB far-infrared imaging Fabry-Perot interferometer (FIFI) |
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Authors: | A. Poglitsch J. W. Beeman N. Geis R. Genzel M. Haggerty E. E. Haller J. Jackson M. Rumitz G. J. Stacey C. H. Townes |
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Affiliation: | (1) Max-Planck-Institut für Physik und Astrophysik, D-8046 Garching, West Germany;(2) University of California, 94720 Berkeley, California |
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Abstract: | FIFI is an imaging spectrometer with two or three Fabry-Perot interferometers (FPI) in series for airborne astronomical observations in the far-infrared range (=40...200m). It employs 5×5 arrays of photoconducting detectors and offers spectral resolutions as small as 2km/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 in-flight step tunable spatial resolution. At 158 m wavelength the background-limited NEP is 3 × 10-15W/Hz at 40 km/s resolution and with two FPI's; with three FPI's the expected NEP is 10-15WHz at 5 km/s resolution.The frequency-chopping mode of the high-resolution Fabry-Perot allows for line detection in extended objects. Absolute internal flux calibration ensures adequate flat fielding of the array elements. |
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Keywords: | Spectrometer Infrared Astronomy Infrared Techniques Detector Array Cryogenic Electronics Fabry-Perot Cryogenic Imaging Instrument Function |
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