PRONAOS: a balloon-borne experiment for submillimeter radioastronomy with a 380-GHz heterodyne spectrometer

Details PRONAOS: a balloon-borne experiment for submillimeter radioastronomy with a 380-GHz heterodyne spectrometer PRONAOS: a balloon-borne experiment for submillimeter radioastronomy with a 380-GHz heterodyne spectrometer

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1874..246b&link_type=abstract

Proc. SPIE Vol. 1874, p. 246-255, Infrared and Millimeter-Wave Engineering, Harold T. Buscher; Ed.

Astronomy and Astrophysics

Astrophysics

Scientific paper

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 O(subscript 2) and the 380 GHz H(subscript 2)O 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 m(superscript 3) 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 LiNbO(subscript 3) centered at 2 GHz.

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