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Proceedings Paper

Completely open-foldable domes remaining cool in sunshine
Author(s): Robert H. Hammerschlag; Sander Deelen; Pieter W. Hoogendoorn; Johannes N. M. Kommers; Thomas Sonner; Roberto Simoes; Olivier Grassin; Andreas Fischer; Simon Visser; Kristof Thewissen
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Paper 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.

Paper Details

Date Published: 22 July 2016
PDF: 14 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99121E (22 July 2016); doi: 10.1117/12.2232097
Show Author Affiliations
Robert H. Hammerschlag, Leiden Univ. (Netherlands)
Utrecht Univ. (Netherlands)
Sander Deelen, Utrecht Univ. (Netherlands)
Pieter W. Hoogendoorn, Leiden Univ. (Netherlands)
Utrecht Univ. (Netherlands)
Johannes N. M. Kommers, Leiden Univ. (Netherlands)
Thomas Sonner, Kiepenheuer-Institut für Sonnenphysik (Germany)
Roberto Simoes, Kiepenheuer-Institut für Sonnenphysik (Germany)
Olivier Grassin, Kiepenheuer-Institut für Sonnenphysik (Germany)
Andreas Fischer, Kiepenheuer-Institut für Sonnenphysik (Germany)
Simon Visser, Poly-Ned BV (Netherlands)
Kristof Thewissen, Hercorub NV (Belgium)

Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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