Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..445...42a&link_type=abstract
IN: Instrumentation in astronomy V; Proceedings of the Fifth Meeting, London, England, September 7-9, 1983 (A85-25360 10-89). Be
Astronomy and Astrophysics
Astronomy
1
Airborne Equipment, Fabry-Perot Interferometers, Far Infrared Radiation, Infrared Astronomy, Infrared Interferometers, Infrared Scanners, Flight Tests, H Ii Regions, High Resolution, Infrared Spectroscopy, Michelson Interferometers, Spectral Resolution
Scientific paper
A nickel-mesh Fabry-Perot interferometer for the FIR spectroscopic study of astronomical objects has been built and flight-tested. The interferometer was used in conjunction with a liquid-helium-cooled FIR photometer with four passband filters in the region 30-200 microns, which serve as prefilters. The photometer along with a Ge 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 instrument had a spectral resolving power of 100-200. Higher resolutions 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 FIR, where numerous collisionally excited forbidden emission lines from atoms and ions exist. An attempt was made to measure the forbidden emission line of singly-ionized carbon at 157 microns 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 37,000 ft. The details of the instrument and its flight performance are presented.
Anandarao Boddapati G.
Léna Pierre
Wijnbergen Jan J.
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