The AOS - Widening the radio sky

Details The AOS - Widening the radio sky The AOS - Widening the radio sky

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980s%26t....60..108c&link_type=abstract

Sky and Telescope, vol. 60, Aug. 1980, p. 108-110.

Physics

Optics

2

Acousto-Optics, Laser Applications, Radio Astronomy, Radio Telescopes, Spectrographs, Design Analysis, Pulsars, Quasars, Radio Spectra, Scintillation

Scientific paper

The acoustical-optical spectrograph (AOS) which uses an interaction between laser light and ultrasonic vibrations is discussed. It modulates a laser beam with signals from a radio telescope, which produces a radio spectrum displayed as a band of light to be detected by an array of photodiodes. The unit resolves a 250 MHz band into 256 channels, and, with a broad-band antenna feed and amplifier system on the 64-meter radio telescope, can study the radio spectrum from 275 to 525 MHz. Pulsar observations show the advantages of the AOS in that it can show phenomena which had been inferred only indirectly from narrow-band measurements, and that the energy in individual pulses can be summed over a large bandwidth. New details of quasar scintillation are shown that were made possible by AOS observations.

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