Telescope illumination and beam measurements for submillimeter astronomy

Details Telescope illumination and beam measurements for submillimeter astronomy Telescope illumination and beam measurements for submillimeter astronomy

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ijimw...9..231h&link_type=abstract

International Journal of Infrared and Millimeter Waves (ISSN 0195-9271), vol. 9, March 1988, p. 231-247.

Astronomy and Astrophysics

Astronomy

11

Infrared Telescopes, Radio Astronomy, Submillimeter Waves, Apertures, Diffraction Limited Cameras, Normal Density Functions, Power Spectra

Scientific paper

Calculations are presented for the aperture efficiency, beam shape, and beam efficiency of a number of telescopes used for submillimeter astronomical observations. It is noted that the optics of these telescopes are not optimized for tapered beam illuminations, but have large central obscurations in comparison with radio telescopes. The results indicate that the aperture power edge taper should lie between 10 and 13 dB, or slightly less if the central linear blockage is greater than 0.3. An accurate method is proposed for measuring the size of, and deviations from, Gaussian beam pattern distributions by using astronomical sources with sizes comparable to the beam.

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