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15 July 1993 PRONAOS: a balloon-borne experiment for submillimeter radioastronomy with a 380-GHz heterodyne spectrometer
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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Proceedings Volume 1874, Infrared and Millimeter-Wave Engineering; (1993) https://doi.org/10.1117/12.148067
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
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.
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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, and Jean-Pierre Vola "PRONAOS: a balloon-borne experiment for submillimeter radioastronomy with a 380-GHz heterodyne spectrometer", Proc. SPIE 1874, Infrared and Millimeter-Wave Engineering, (15 July 1993); https://doi.org/10.1117/12.148067
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KEYWORDS
Spectroscopy
Space telescopes
Receivers
Acousto-optics
Observatories
Telescopes
Heterodyning
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