Physics – Optics
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spie..231..291m&link_type=abstract
In: 1980 International Optical Computing Conference, Washington, DC, April 8-11, 1980, Proceedings. Book 1. (A81-37755 17-35) Be
Physics
Optics
6
Acousto-Optics, Millimeter Waves, Radio Astronomy, Radio Spectroscopy, Radio Telescopes, Signal Stabilization, Bandwidth, Design Analysis, Microwave Imagery, Multichannel Communication, Preamplifiers, Prototypes
Scientific paper
It is only recently that working astronomical acousto-optical spectrometers (AOS) have been constructed. The highly stable AOS required for astronomical applications could only be built after a number of technical difficulties had been overcome. The considered investigation provides an analysis of the design problems of AOS and of the techniques used to overcome them. Attention is given to the requirements for radio astronomical spectrometers, drifts in spectrometers, performance criteria for spectrometers, sources of noise and drift, preamplifier noise, frequency drift, air currents, the construction of experimental AOS, the performance of the prototype, the design of an improved AOS, and future prospects. It is pointed out that there are no fundamental obstacles to the construction of AOS with stability adequate for astronomical applications. Such AOS can have approximately 1000 channels and overall bandwidths from 20 MHz to 1 GHz.
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