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Proceedings Paper

A Scanning Metallic-Mesh Fabry-Perot Interferometer For Airborne Far Infrared Astronomy
Author(s): B. G. Anandarao; J Wijnbergen; P Lena
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Paper Abstract

A nickel-mesh Fabry- Perot interferometer for far infrared spectroscopic study of astronomical objects had been built and flight-tested. The interferometer was used in conjunction with a liquid helium-cooled far infrared photometer with four pass-band filters in the region 30-200 μm, which serve as prefilters. The photometer alongwith a Germanium bolometer detector was maintained at a temperature of 1.6 K by pumping down on the liquid helium, while the Fabry- Perot itself was at room temperature. In this setup the instru-ment had a spectral resolving power of 100-200 in the range 30-200 μm. Higher resolut ions may be obtained by using higher orders of the Fabry- Perot, with narrow-band prefilters. The main advantage of this instrument is that it can be used with any multiband photometer to cover a wide spectral range in the far infrared where numerous collisionally excited forbidden emission lines from atoms and ions exist. An attempt was made to measure the forbidden emission line of the singly-ionized carbon at 157 μ m in the extragalactic H II region, 30 Doradus, using this instrument at the Coude focus of a 32 cm telescope on board a Caravelle aircraft flying at 37000 ft. The details of the instrument and its flight performance are presented.

Paper Details

Date Published: 9 January 1984
PDF: 5 pages
Proc. SPIE 0445, Instrumentation in Astronomy V, (9 January 1984); doi: 10.1117/12.966124
Show Author Affiliations
B. G. Anandarao, Physical Research Laboratory (India)
J Wijnbergen, University of Groningen (Netherlands)
P Lena, Observatoire de Paris (France)


Published in SPIE Proceedings Vol. 0445:
Instrumentation in Astronomy V
Alec Boksenberg; David L. Crawford, Editor(s)

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