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Proceedings Paper

PRONAOS: a balloon-borne experiment for submillimeter radioastronomy with a 380-GHz heterodyne spectrometer
Author(s): Gerard Beaudin; A. Deschamps; P. Encrenaz; Philippe Feautrier; Pascal Febvre; C. Gac; M. Gheudin; B. Leridon; Roberto Maoli; Daniel Michet; J. C. Pernot; Clelia Robert; Carlo Rosolen; G. Ruffie; Jean-Pierre Vola
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Paper Abstract

A balloon-borne observatory (PRONAOS) including a two meter telescope associated with a submillimeter heterodyne spectrometer for radioastronomy is supported by the French space agency (CNES) to prepare the future space programs in astrophysics. This instrument will be used to simultaneously detect the 368 GHz O2 and the 380 GHz H2O lines in the interstellar medium. Observations in this part of the spectrum require low atmospheric water vapor and oxygen molecule emission, so that the telescope will fly under a 1,000,000 m3 balloon at an altitude of approximately equals 37 km. The receiver, under development at Meudon Observatory, includes a SIS mixer using Nb/AlOx/Nb tunnel junctions operating at 4 K, a 6 GHz IF low-noise cooled preamplifier, a LO quasi-optically injected with a phase locked Gunn oscillator and two cascaded frequency multipliers. Noise temperature as low as 300 K has been obtained; less than 200 K is expected. An 800 MHz Acousto-Optical Spectrometer (AOS) is used for the high resolution (800 kHz) spectral analysis. The optimization of the frequency resolution of the spectrometer was obtained in the design and building of a new kind of Bragg cell in LiNbO3 centered at 2 GHz.

Paper Details

Date Published: 15 July 1993
PDF: 10 pages
Proc. SPIE 1874, Infrared and Millimeter-Wave Engineering, (15 July 1993); doi: 10.1117/12.148067
Show Author Affiliations
Gerard Beaudin, Observatoire de Paris-Meudon (France)
A. Deschamps, Observatoire de Paris-Meudon (France)
P. Encrenaz, Ecole Normale Superieure (France)
Philippe Feautrier, Ecole Normale Superieure (France)
Pascal Febvre, Observatoire de Paris-Meudon (France) and Jet Propulsion Lab. (France)
C. Gac, Observatoire de Paris-Meudon (France)
M. Gheudin, Observatoire de Paris-Meudon (France)
B. Leridon, Observatoire de Paris-Meudon (France)
Roberto Maoli, Observatoire de Paris-Meudon (France)
Daniel Michet, Observatoire de Paris-Meudon (France)
J. C. Pernot, Ecole Normale Superieure (France)
Clelia Robert, Observatoire de Paris-Meudon (France)
Carlo Rosolen, Observatoire de Paris-Meudon (France)
G. Ruffie, Observatoire de Paris-Meudon (France)
Jean-Pierre Vola, Observatoire de Paris-Meudon (France)

Published in SPIE Proceedings Vol. 1874:
Infrared and Millimeter-Wave Engineering
Harold T. Buscher, Editor(s)

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