Physics – Optics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.189..189r&link_type=abstract
In ESA The Sci. Importance of Submillimetre Observations p 189-196 (SEE N83-22034 11-88)
Physics
Optics
1
Carbon Dioxide Lasers, Cassegrain Optics, Heterodyning, Laser Spectrometers, Telescopes, Atmospheric Turbulence, Digital Filters, High Resolution, Radio Frequencies, Remote Sensing
Scientific paper
A quasi-optical receiver is using a grating tunable CO2 laser as local oscillator and a photovoltaic detector for frontend mixing. The sensitivity of this system is approaching the quantum noise limit. The bandwidth (2 GHz) is sufficient for high resolving spectroscopy at selected astronomical objects. For illustration a subdoppler emission of Mars measured with a resolution of 5,000,000 will be shown, which was obtained with the 2.2 m mirror on Calar Alto in April '82. The optical section, high frequency section, filter section, synchronous detection in 30 parallel channels and data reduction are presented at the block diagram level. An electrooptical modulator operative between 18 and 26 GHz to be incorporated for the next observation period allows for additional laser tunability.
Kaeufl Hans Ulrich
Rothermel Hermann
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