STEPS TOWARD 8m HONEYCOMB MIRRORS IV

SOME ASPECTS OF DESIGN AND FABRICATION.

J Roger P Angel, N. J. Woolf, J. M. Hill, L. Goble

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

A facility is to be built to make 8m diameter glass honeycomb mirror blanks by casting, in the same way that has been demonstrated with 1. 8m blanks. The only major difference is that the larger furnace will be rotated on a turntable so as to preform the deep parabolic surface needed for f/2 mirrors. This paper explores the tolerances in glass homogeneity, thermal control and support of the blank necesssary to meet the stringent imaging requirements of telescopes in the best ground based sites. In round numbers, homogenity in expansion coefficient of 10** minus **8/ degree C and thermal equilibriation to 0. 1 degree C are required. Laboratory measurements show that both can be met by a ventilated honeycomb of borosilicate or similar glass. Adequate resistance to wind pressure and buffeting can be achieved by an axial support that responds to pressure on the three defining points.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Pages194-199
Number of pages6
Volume444
ISBN (Print)0892523794
StatePublished - 1984

Fingerprint

honeycomb mirrors
blanks
Fabrication
Glass
fabrication
glass
buffeting
Buffeting
Phonographs
wind pressure
preforms
Antenna grounds
borosilicate glass
Telescopes
homogeneity
furnaces
Casting
Mirrors
Furnaces
telescopes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Angel, J. R. P., Woolf, N. J., Hill, J. M., & Goble, L. (1984). STEPS TOWARD 8m HONEYCOMB MIRRORS IV: SOME ASPECTS OF DESIGN AND FABRICATION. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 444, pp. 194-199). SPIE.

STEPS TOWARD 8m HONEYCOMB MIRRORS IV : SOME ASPECTS OF DESIGN AND FABRICATION. / Angel, J Roger P; Woolf, N. J.; Hill, J. M.; Goble, L.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 444 SPIE, 1984. p. 194-199.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Angel, JRP, Woolf, NJ, Hill, JM & Goble, L 1984, STEPS TOWARD 8m HONEYCOMB MIRRORS IV: SOME ASPECTS OF DESIGN AND FABRICATION. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 444, SPIE, pp. 194-199.
Angel JRP, Woolf NJ, Hill JM, Goble L. STEPS TOWARD 8m HONEYCOMB MIRRORS IV: SOME ASPECTS OF DESIGN AND FABRICATION. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 444. SPIE. 1984. p. 194-199
Angel, J Roger P ; Woolf, N. J. ; Hill, J. M. ; Goble, L. / STEPS TOWARD 8m HONEYCOMB MIRRORS IV : SOME ASPECTS OF DESIGN AND FABRICATION. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 444 SPIE, 1984. pp. 194-199
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