By Topic

A Broad-Band Microwave Source Comparison Radiometer for Advanced Research in Radio Astronomy

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Drake, F.D. ; Harvard College Observatory, Cambridge, Mass., and Ewen Knight Corp., Needham Heights, Mass. ; Ewen, H.I.

A sensitive microwave radiometer system operating at short centimeter wavelengths has been developed which will allow large extensions of the known spectra of a large number of radio sources; facilitate the measurement of source polarization; give information on galactic structure and the sources of galactic radio emission; provide new data on the physical structure of planetary nebulas; and provide a means of measuring more accurately planetary temperatures, and the precise position of the brighter radio sources. A traveling-wave tube radiometer operating at 8000 mc with a bandwidth of 1000 mc and sensitivities of the order of 0.01°K is described. The radiometer is more than one order of magnitude more sensitive than other existing radiometers operating at 8000 mc. The very serious effects of gain fluctuations, acting on small residual signals, when trying to achieve very high sensitivities, are discussed. A means of eliminating such effects by introducing compensating noise has been found successful. Radio observations with this radiometer in conjunction with a 28-foot parabolic reflector have shown that: 1) The predicted sensitivity is achieved. 2) Zero-level stability is extremely high. 3) It has been possible to detect in detail the distribution of radio brightness at this wavelength in the vicinity of the galactic plane. 4) Radiation from the planets Jupiter and Saturn has been detected, this being the first detection of Saturn as a radio source. 5) Radiation from two planetary nebulas has been detected, this being the first detection of these objects as radio sources.

Published in:

Proceedings of the IRE  (Volume:46 ,  Issue: 1 )