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Proceedings Paper

Helium-Cooled Michelson Interferometer For Far-Infrared Astronomy Aboard German Infrared Laboratory (GIRL)
Author(s): S. Drapatz; R. Hofmann; R. Katterloher
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Paper Abstract

Spectroscopy of astronomical objects in the mid- and far-infrared region will contribute substantially to our understanding of basic astrophysical processes (e.g. formation of stars and galaxies). Therefore, a Michelson Interferometer is being built for line spectroscopy in the wavenumber range below 500 cm-1 allowing a maximum spectral resolution of 0.03 cm-1 for a field of view between 1 and 3 arcmin. Several specific components are used in the helium cooled environment (heat loss permitted ≈200 mW): (i) a special type of stepping motor driving a ball pivot, (ii) a corner cube reflector for tilt compensation, (iii) a diode laser measuring the path difference, (iv) piezoelectric transducers for mirror alignment, (v) high sensitivity photoconductors giving a NESR = 8 x 10-13 W/(cm2 sr cm-1) which is orders of magnitude lower than for comparable astronomical instruments that exist. The instrument shall be used aboard the German Infrared Laboratory (GIRL) which is an infrared astronomy observatory on SPACELAB to be flown in 1986.

Paper Details

Date Published: 29 October 1981
PDF: 4 pages
Proc. SPIE 0289, 1981 Intl Conf on Fourier Transform Infrared Spectroscopy, (29 October 1981); doi: 10.1117/12.932128
Show Author Affiliations
S. Drapatz, Max-Planck-Institut fur Extraterrestrische Physik (Germany)
R. Hofmann, Max-Planck-Institut fur Extraterrestrische Physik (Germany)
R. Katterloher, Max-Planck-Institut fur Extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 0289:
1981 Intl Conf on Fourier Transform Infrared Spectroscopy
Hajime Sakai, Editor(s)

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