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20 August 1986 The ESO Very Large Telescope Project
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The ESO VLT base line concept is a fixed array of four 8 m telescopes; other concepts based on the same optical configuration for the unit telescopes are however still considered. Among other possibilities, the two main options for the primary mirror blank are either low expansion glass ceramic or highly structured steel. Limited tests have been done with both solutions. The unit telescopes have a classical Alt-Azimuth architecture but are designed so as to operate in the open air without a surrounding building. Their proper functioning relies heavily on the active control of the optical elements. The building is intended to provide only a day time protection. Several types of low cost enclosures have been investigated. A partial protection against the prevailing strong winds is also under consideration.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel Enard "The ESO Very Large Telescope Project", Proc. SPIE 0628, Advanced Technology Optical Telescopes III, (20 August 1986);

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