The design study of a far infrared heterodyne spectrometer assembly, volume 1

Details The design study of a far infrared heterodyne spectrometer assembly, volume 1 The design study of a far infrared heterodyne spectrometer assembly, volume 1

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980badg.reptq.....&link_type=abstract

Final Report British Aerospace Dynamics Group, Bristol (England). Electronic and Space Systems.

Physics

Optics

Design Analysis, Far Infrared Radiation, Filter Wheel Infrared Spectrometers, Heterodyning, Spaceborne Astronomy, Acousto-Optics, Autocorrelation, Bragg Cells, Carcinotrons, Dichroism, Intermediate Frequencies, Mixing Circuits, Power Conditioning, Schottky Diodes

Scientific paper

The design of a high spectral resolution submillimeter wave heterodyne spectrometer assembly for spaceborne astronomy was studied. A frequency range of 300 to 500 GHz is planned with the possibility of extension to 1000 GHz. Frequency and phase lock loop control of the carcinotron local oscillator is envisaged via the power conditioner for the telescope to the spectrometer. The signal and LO beams after passing through a Michelson diplexer are combined in a Schottky barrier diode mixer giving a 4 GHz intermediate frequency signal of one GHz bandwidth. An acousto-optic (integrated Bragg cell) device will operate as a coarse resolution (2 MHz) signal processor, while in the fine resolution mode (50 kHz) a choice exists between microscan (comprehensive spectrum analysis) and binary autocorrelator devices. A microprocessor system with manual override would be used to control the spectrometer. Required hardware developments are discussed.

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