Comparison of radome- and astrodome-enclosed large radio telescopes at millimeter wavelengths: the large millimeter telescope

Luca Olmi, Philip Mauskopf

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present a systematic comparison of the main figures of merit for an open-air radio telescope and two different types of enclosed antennas: (1) an ordinary radome, with a metal space frame providing the required mechanical rigidity and a dielectric membrane, and (2) and 'astrodome,' i.e., a corotating rigid dome with a large window covered by a tensile membrane structure. The analysis is limited to submillimeter and millimeter wavelengths and large (≲30 m) antenna/enclosure systems, where the window tensile structure is very unlikely to be removable and is supported by either a metal space frame or cable networks. As compared with previous studies of this type, here we concentrate on the specific effects that these large metallic support structures have on sensitive astronomical observations. In particular, we critically discuss how the wind-induced random motions of the metal space frame can limit the sensitivity of continuum observations, as a result of fluctuating shadowing and spillover effects combined with various beam-chopping techniques. Using the Large Millimeter Telescope as a benchmark, we provide baselines for future projects where a similar comparison is needed.

Original languageEnglish (US)
Pages (from-to)733-746
Number of pages14
JournalRadio Science
Volume34
Issue number3
DOIs
StatePublished - May 1999
Externally publishedYes

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radomes
Radomes
Radio telescopes
radio telescopes
Telescopes
Metals
telescopes
radio
wavelength
Wavelength
antenna
metal
antennas
wavelengths
metals
Antennas
membrane
spillover effect
type of study
membrane structures

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Atmospheric Science
  • Computers in Earth Sciences
  • Geochemistry and Petrology
  • Geophysics
  • Instrumentation

Cite this

Comparison of radome- and astrodome-enclosed large radio telescopes at millimeter wavelengths : the large millimeter telescope. / Olmi, Luca; Mauskopf, Philip.

In: Radio Science, Vol. 34, No. 3, 05.1999, p. 733-746.

Research output: Contribution to journalArticle

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