Astigmatism in reflector antennas: measurement and correction

Author

Greve, A. ; LeFloch, B. ; Morris, D. ; Hein, H. ; Navarro, S.

Author_Institution

IRAM, Granada, Spain

Volume

42

Issue

9

fYear

1994

fDate

9/1/1994 12:00:00 AM

Firstpage

1345

Lastpage

1350

Abstract

Investigates astigmatism is Cassegrain antennas from cross scans through in-and-out-of-focus diffraction images of extended radio sources. The use of extended sources is of interest for large (mm-wavelength) telescopes where the bright planets subtend a substantial fraction of the beam. The experimental and theoretical results presented refer to the IRAM 30-m telescope and measurements at 7.3 mm-1.3 mm wavelength; however, extrapolation to other telescopes is evident. The authors report on an experiment to correct the astigmatism (phase) at a position close to the focal plane of the telescope, i.e. the flat surface of the corotating Nasmyth mirror

Keywords

aberrations; antenna testing; mirrors; radiotelescopes; reflector antennas; 1.3 to 7.3 mm; 30 m; Cassegrain antennas; IRAM 30-m telescope; astigmatism correction; astigmatism measurement; bright planets; corotating Nasmyth mirror; cross scans; diffraction images; extended radio sources; extrapolation; focal plane; mm-wavelength telescopes; phase corection; reflector antennas; Antenna measurements; Diffraction; Extrapolation; Extraterrestrial measurements; Mirrors; Planets; Reflector antennas; Telescopes; Vision defects; Wavelength measurement;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.318665

Filename

318665