22 July 2016 Completely open-foldable domes remaining cool in sunshine
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Abstract
These open-foldable very light-weight domes, based on very strong textile membranes highly tensioned between steel bows, are designed for bad-weather protection and maintenance of instruments for astronomical, meteorological and civil-engineering measurements and have extremely high wind stability. The domes of the GREGOR telescope and the Dutch Open Telescope are the two existing prototypes. Improvements were developed with all parts light-colored to remain cool in solar light. The new specially made connection parts (eyes) between the textile parts are made from white-colored PETP, a very strong and UV-stable synthetic, and have a better geometrical shape giving higher stability. The rubber seal tubes on top of the dome were of black-colored chloride rubber CR (neoprene), strong and UV stable, but very warm in sunlight. New UV-stable EPDM rubber tubes were produced in natural light color. To get this rubber stiff enough to give good sealing, a black-colored stiff EPDM rubber is put inside the light-colored one. Tests were performed and the forces necessary for compression of the rubber tubes were measured. An inside black tube with a circa 1.3 times larger compression force than the original black tubes was applied. The assembling of the black tubes into the light-colored tubes was successfully applied at the DOT and GREGOR domes.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert H. Hammerschlag, Robert H. Hammerschlag, Sander Deelen, Sander Deelen, Pieter W. Hoogendoorn, Pieter W. Hoogendoorn, Johannes N. M. Kommers, Johannes N. M. Kommers, Thomas Sonner, Thomas Sonner, Roberto Simoes, Roberto Simoes, Olivier Grassin, Olivier Grassin, Andreas Fischer, Andreas Fischer, Simon Visser, Simon Visser, Kristof Thewissen, Kristof Thewissen, "Completely open-foldable domes remaining cool in sunshine", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99121E (22 July 2016); doi: 10.1117/12.2232097; https://doi.org/10.1117/12.2232097
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