Diffraction of an angular spectrum of waves by a phase-changing screen

Details Diffraction of an angular spectrum of waves by a phase-changing screen Diffraction of an angular spectrum of waves by a phase-changing screen

Jan 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29....1b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 1, pp. 1-28

Physics

3

Scientific paper

The diffraction of waves by a phase-changing screen is studied for the case in which the incident waves have a spread in direction, as from an extended source. The variance and autocorrelation of the intensity, i.e. the square of the signal amplitude, are calculated for receivers at an arbitrary distance from the screen, when the phase changes imposed by the screen are small. The behaviour of a phase-switched radio stellar interferometer is analyzed; the statistics of its output are calculated under the above conditions, and related to those for a single receiver. In general, interferometer output fluctuations are smaller than those of the intensity measured at a single aerial, but the reverse is true at points close to the screen. The limiting results for receivers which are either very close to or very far away from the screen are also given for screens which produce arbitrarily large phase changes. The conditions leading to a fadeout of the interferometer output are also discussed, and it is shown that these would apply equally to point and extended sources.

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